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SCHEDULE III - REAL ESTATE AND ACCUMULATED DEPRECIATION (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Deductions during year      
Total real estate investments, excluding mortgage notes receivable $ 1,998,723 $ 1,870,854  
Net basis of real estate investments for federal income tax purposes 1,500,000 1,800,000  
Wholly Owned Properties      
Gross amount at which carries at close of period [Abstract]      
Total 2,534,124 2,271,170 $ 1,812,557
Accumulated Depreciation (535,401) (443,592) (399,249)
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]      
Balance at beginning of year 2,271,170 1,812,557 1,643,077
Multifamily and Other 206,623 491,648 181,771
Improvements and Other 57,203 34,427 27,460
Total additions including opening balance 2,534,996 2,338,632 1,852,308
Cost of real estate sold 0 (57,698) (38,111)
Other (872) (9,764) (1,640)
Balance at close of year 2,534,124 2,271,170 1,812,557
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate, Accumulated Depreciation [Roll Forward]      
Balance at beginning of year 443,592 399,249 349,122
Additions during year      
Provisions for depreciation 92,056 78,268 72,051
Deductions during year      
Accumulated depreciation on real estate sold or classified as held for sale 0 (24,161) (21,440)
Other (247) (9,764) (484)
Balance at close of year 535,401 443,592 399,249
Total real estate investments, excluding mortgage notes receivable 1,998,723 $ 1,827,578 $ 1,413,308
Multi Family Same-Store      
Real Estate And Accumulated Depreciation [Abstract]      
Encumbrances 235,559    
Initial Cost to Company [Abstract]      
Land 142,236    
Buildings & Improvements 1,427,116    
Costs capitalized subsequent to acquisition 225,192    
Gross amount at which carries at close of period [Abstract]      
Land 158,655    
Buildings & Improvements 1,635,889    
Total 1,794,544    
Accumulated Depreciation (497,331)    
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]      
Balance at close of year 1,794,544    
Deductions during year      
Balance at close of year 497,331    
Multi Family Same-Store | 71 France - Edina, MN      
Real Estate And Accumulated Depreciation [Abstract]      
Encumbrances 50,933    
Initial Cost to Company [Abstract]      
Land 4,721    
Buildings & Improvements 61,762    
Costs capitalized subsequent to acquisition 781    
Gross amount at which carries at close of period [Abstract]      
Land 4,801    
Buildings & Improvements 62,463    
Total 67,264    
Accumulated Depreciation (19,278)    
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]      
Balance at close of year 67,264    
Deductions during year      
Balance at close of year $ 19,278    
Multi Family Same-Store | 71 France - Edina, MN | Minimum      
Gross amount at which carries at close of period [Abstract]      
Life on which depreciation in latest income statement is computed 30 years    
Multi Family Same-Store | 71 France - Edina, MN | Maximum      
Gross amount at which carries at close of period [Abstract]      
Life on which depreciation in latest income statement is computed 37 years    
Multi Family Same-Store | Alps Park Apartments - Rapid City, SD      
Real Estate And Accumulated Depreciation [Abstract]      
Encumbrances $ 0    
Initial Cost to Company [Abstract]      
Land 287    
Buildings & Improvements 5,551    
Costs capitalized subsequent to acquisition 731    
Gross amount at which carries at close of period [Abstract]      
Land 336    
Buildings & Improvements 6,233    
Total 6,569    
Accumulated Depreciation (2,053)    
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]      
Balance at close of year 6,569    
Deductions during year      
Balance at close of year $ 2,053    
Multi Family Same-Store | Alps Park Apartments - Rapid City, SD | Minimum      
Gross amount at which carries at close of period [Abstract]      
Life on which depreciation in latest income statement is computed 30 years    
Multi Family Same-Store | Alps Park Apartments - Rapid City, SD | Maximum      
Gross amount at which carries at close of period [Abstract]      
Life on which depreciation in latest income statement is computed 37 years    
Multi Family Same-Store | Arcata Apartments - Golden Valley, MN      
Real Estate And Accumulated Depreciation [Abstract]      
Encumbrances $ 0    
Initial Cost to Company [Abstract]      
Land 2,088    
Buildings & Improvements 31,036    
Costs capitalized subsequent to acquisition 576    
Gross amount at which carries at close of period [Abstract]      
Land 2,128    
Buildings & Improvements 31,572    
Total 33,700    
Accumulated Depreciation (10,664)    
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]      
Balance at close of year 33,700    
Deductions during year      
Balance at close of year $ 10,664    
Multi Family Same-Store | Arcata Apartments - Golden Valley, MN | Minimum      
Gross amount at which carries at close of period [Abstract]      
Life on which depreciation in latest income statement is computed 30 years    
Multi Family Same-Store | Arcata Apartments - Golden Valley, MN | Maximum      
Gross amount at which carries at close of period [Abstract]      
Life on which depreciation in latest income statement is computed 37 years    
Multi Family Same-Store | Ashland Apartment Homes - Grand Forks, ND      
Real Estate And Accumulated Depreciation [Abstract]      
Encumbrances $ 0    
Initial Cost to Company [Abstract]      
Land 741    
Buildings & Improvements 7,569    
Costs capitalized subsequent to acquisition 402    
Gross amount at which carries at close of period [Abstract]      
Land 823    
Buildings & Improvements 7,889    
Total 8,712    
Accumulated Depreciation (2,981)    
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]      
Balance at close of year 8,712    
Deductions during year      
Balance at close of year $ 2,981    
Multi Family Same-Store | Ashland Apartment Homes - Grand Forks, ND | Minimum      
Gross amount at which carries at close of period [Abstract]      
Life on which depreciation in latest income statement is computed 30 years    
Multi Family Same-Store | Ashland Apartment Homes - Grand Forks, ND | Maximum      
Gross amount at which carries at close of period [Abstract]      
Life on which depreciation in latest income statement is computed 37 years    
Multi Family Same-Store | Avalon Cove Townhomes - Rochester, MN      
Real Estate And Accumulated Depreciation [Abstract]      
Encumbrances $ 0    
Initial Cost to Company [Abstract]      
Land 1,616    
Buildings & Improvements 34,074    
Costs capitalized subsequent to acquisition 1,880    
Gross amount at which carries at close of period [Abstract]      
Land 1,808    
Buildings & Improvements 35,762    
Total 37,570    
Accumulated Depreciation (8,751)    
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]      
Balance at close of year 37,570    
Deductions during year      
Balance at close of year $ 8,751    
Multi Family Same-Store | Avalon Cove Townhomes - Rochester, MN | Minimum      
Gross amount at which carries at close of period [Abstract]      
Life on which depreciation in latest income statement is computed 30 years    
Multi Family Same-Store | Avalon Cove Townhomes - Rochester, MN | Maximum      
Gross amount at which carries at close of period [Abstract]      
Life on which depreciation in latest income statement is computed 37 years    
Multi Family Same-Store | Boulder Court Apartment Homes - Eagan, MN      
Real Estate And Accumulated Depreciation [Abstract]      
Encumbrances $ 0    
Initial Cost to Company [Abstract]      
Land 1,067    
Buildings & Improvements 5,498    
Costs capitalized subsequent to acquisition 3,179    
Gross amount at which carries at close of period [Abstract]      
Land 1,576    
Buildings & Improvements 8,168    
Total 9,744    
Accumulated Depreciation (4,980)    
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]      
Balance at close of year 9,744    
Deductions during year      
Balance at close of year $ 4,980    
Multi Family Same-Store | Boulder Court Apartment Homes - Eagan, MN | Minimum      
Gross amount at which carries at close of period [Abstract]      
Life on which depreciation in latest income statement is computed 30 years    
Multi Family Same-Store | Boulder Court Apartment Homes - Eagan, MN | Maximum      
Gross amount at which carries at close of period [Abstract]      
Life on which depreciation in latest income statement is computed 37 years    
Multi Family Same-Store | Canyon Lake Apartments - Rapid City, SD      
Real Estate And Accumulated Depreciation [Abstract]      
Encumbrances $ 0    
Initial Cost to Company [Abstract]      
Land 305    
Buildings & Improvements 3,958    
Costs capitalized subsequent to acquisition 2,471    
Gross amount at which carries at close of period [Abstract]      
Land 420    
Buildings & Improvements 6,314    
Total 6,734    
Accumulated Depreciation (3,645)    
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]      
Balance at close of year 6,734    
Deductions during year      
Balance at close of year $ 3,645    
Multi Family Same-Store | Canyon Lake Apartments - Rapid City, SD | Minimum      
Gross amount at which carries at close of period [Abstract]      
Life on which depreciation in latest income statement is computed 30 years    
Multi Family Same-Store | Canyon Lake Apartments - Rapid City, SD | Maximum      
Gross amount at which carries at close of period [Abstract]      
Life on which depreciation in latest income statement is computed 37 years    
Multi Family Same-Store | Cardinal Point Apartments - Grand Forks, ND      
Real Estate And Accumulated Depreciation [Abstract]      
Encumbrances $ 0    
Initial Cost to Company [Abstract]      
Land 1,600    
Buildings & Improvements 33,400    
Costs capitalized subsequent to acquisition 540    
Gross amount at which carries at close of period [Abstract]      
Land 1,727    
Buildings & Improvements 33,813    
Total 35,540    
Accumulated Depreciation (5,318)    
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]      
Balance at close of year 35,540    
Deductions during year      
Balance at close of year $ 5,318    
Multi Family Same-Store | Cardinal Point Apartments - Grand Forks, ND | Minimum      
Gross amount at which carries at close of period [Abstract]      
Life on which depreciation in latest income statement is computed 30 years    
Multi Family Same-Store | Cardinal Point Apartments - Grand Forks, ND | Maximum      
Gross amount at which carries at close of period [Abstract]      
Life on which depreciation in latest income statement is computed 37 years    
Multi Family Same-Store | Cascade Shores Townhomes + Flats - Rochester, MN      
Real Estate And Accumulated Depreciation [Abstract]      
Encumbrances $ 45,100    
Initial Cost to Company [Abstract]      
Land 6,588    
Buildings & Improvements 67,072    
Costs capitalized subsequent to acquisition 9,623    
Gross amount at which carries at close of period [Abstract]      
Land 6,776    
Buildings & Improvements 76,507    
Total 83,283    
Accumulated Depreciation (19,922)    
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]      
Balance at close of year 83,283    
Deductions during year      
Balance at close of year $ 19,922    
Multi Family Same-Store | Cascade Shores Townhomes + Flats - Rochester, MN | Minimum      
Gross amount at which carries at close of period [Abstract]      
Life on which depreciation in latest income statement is computed 30 years    
Multi Family Same-Store | Cascade Shores Townhomes + Flats - Rochester, MN | Maximum      
Gross amount at which carries at close of period [Abstract]      
Life on which depreciation in latest income statement is computed 37 years    
Multi Family Same-Store | Castlerock Apartment Homes - Billings, MT      
Real Estate And Accumulated Depreciation [Abstract]      
Encumbrances $ 0    
Initial Cost to Company [Abstract]      
Land 736    
Buildings & Improvements 4,864    
Costs capitalized subsequent to acquisition 2,441    
Gross amount at which carries at close of period [Abstract]      
Land 1,045    
Buildings & Improvements 6,996    
Total 8,041    
Accumulated Depreciation (4,917)    
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]      
Balance at close of year 8,041    
Deductions during year      
Balance at close of year $ 4,917    
Multi Family Same-Store | Castlerock Apartment Homes - Billings, MT | Minimum      
Gross amount at which carries at close of period [Abstract]      
Life on which depreciation in latest income statement is computed 30 years    
Multi Family Same-Store | Castlerock Apartment Homes - Billings, MT | Maximum      
Gross amount at which carries at close of period [Abstract]      
Life on which depreciation in latest income statement is computed 37 years    
Multi Family Same-Store | Chateau Apartment Homes - Minot, ND      
Real Estate And Accumulated Depreciation [Abstract]      
Encumbrances $ 0    
Initial Cost to Company [Abstract]      
Land 301    
Buildings & Improvements 20,058    
Costs capitalized subsequent to acquisition 1,256    
Gross amount at which carries at close of period [Abstract]      
Land 326    
Buildings & Improvements 21,289    
Total 21,615    
Accumulated Depreciation (7,659)    
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]      
Balance at close of year 21,615    
Deductions during year      
Balance at close of year $ 7,659    
Multi Family Same-Store | Chateau Apartment Homes - Minot, ND | Minimum      
Gross amount at which carries at close of period [Abstract]      
Life on which depreciation in latest income statement is computed 30 years    
Multi Family Same-Store | Chateau Apartment Homes - Minot, ND | Maximum      
Gross amount at which carries at close of period [Abstract]      
Life on which depreciation in latest income statement is computed 37 years    
Multi Family Same-Store | Cimarron Hills Apartments - Omaha, NE      
Real Estate And Accumulated Depreciation [Abstract]      
Encumbrances $ 8,700    
Initial Cost to Company [Abstract]      
Land 706    
Buildings & Improvements 9,588    
Costs capitalized subsequent to acquisition 5,256    
Gross amount at which carries at close of period [Abstract]      
Land 1,639    
Buildings & Improvements 13,911    
Total 15,550    
Accumulated Depreciation (8,665)    
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]      
Balance at close of year 15,550    
Deductions during year      
Balance at close of year $ 8,665    
Multi Family Same-Store | Cimarron Hills Apartments - Omaha, NE | Minimum      
Gross amount at which carries at close of period [Abstract]      
Life on which depreciation in latest income statement is computed 30 years    
Multi Family Same-Store | Cimarron Hills Apartments - Omaha, NE | Maximum      
Gross amount at which carries at close of period [Abstract]      
Life on which depreciation in latest income statement is computed 37 years    
Multi Family Same-Store | Commons and Landing at Southgate - Minot, ND      
Real Estate And Accumulated Depreciation [Abstract]      
Encumbrances $ 0    
Initial Cost to Company [Abstract]      
Land 5,945    
Buildings & Improvements 47,512    
Costs capitalized subsequent to acquisition 2,793    
Gross amount at which carries at close of period [Abstract]      
Land 6,424    
Buildings & Improvements 49,826    
Total 56,250    
Accumulated Depreciation (17,451)    
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]      
Balance at close of year 56,250    
Deductions during year      
Balance at close of year $ 17,451    
Multi Family Same-Store | Commons and Landing at Southgate - Minot, ND | Minimum      
Gross amount at which carries at close of period [Abstract]      
Life on which depreciation in latest income statement is computed 30 years    
Multi Family Same-Store | Commons and Landing at Southgate - Minot, ND | Maximum      
Gross amount at which carries at close of period [Abstract]      
Life on which depreciation in latest income statement is computed 37 years    
Multi Family Same-Store | Connelly on Eleven - Burnsville, MN      
Real Estate And Accumulated Depreciation [Abstract]      
Encumbrances $ 0    
Initial Cost to Company [Abstract]      
Land 2,401    
Buildings & Improvements 11,515    
Costs capitalized subsequent to acquisition 17,012    
Gross amount at which carries at close of period [Abstract]      
Land 3,206    
Buildings & Improvements 27,722    
Total 30,928    
Accumulated Depreciation (16,356)    
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]      
Balance at close of year 30,928    
Deductions during year      
Balance at close of year $ 16,356    
Multi Family Same-Store | Connelly on Eleven - Burnsville, MN | Minimum      
Gross amount at which carries at close of period [Abstract]      
Life on which depreciation in latest income statement is computed 30 years    
Multi Family Same-Store | Connelly on Eleven - Burnsville, MN | Maximum      
Gross amount at which carries at close of period [Abstract]      
Life on which depreciation in latest income statement is computed 37 years    
Multi Family Same-Store | Cottonwood Apartment Homes - Bismarck, ND      
Real Estate And Accumulated Depreciation [Abstract]      
Encumbrances $ 0    
Initial Cost to Company [Abstract]      
Land 1,056    
Buildings & Improvements 17,372    
Costs capitalized subsequent to acquisition 6,308    
Gross amount at which carries at close of period [Abstract]      
Land 1,962    
Buildings & Improvements 22,774    
Total 24,736    
Accumulated Depreciation (13,762)    
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]      
Balance at close of year 24,736    
Deductions during year      
Balance at close of year $ 13,762    
Multi Family Same-Store | Cottonwood Apartment Homes - Bismarck, ND | Minimum      
Gross amount at which carries at close of period [Abstract]      
Life on which depreciation in latest income statement is computed 30 years    
Multi Family Same-Store | Cottonwood Apartment Homes - Bismarck, ND | Maximum      
Gross amount at which carries at close of period [Abstract]      
Life on which depreciation in latest income statement is computed 37 years    
Multi Family Same-Store | Country Meadows Apartment Homes - Billings, MT      
Real Estate And Accumulated Depreciation [Abstract]      
Encumbrances $ 0    
Initial Cost to Company [Abstract]      
Land 491    
Buildings & Improvements 7,809    
Costs capitalized subsequent to acquisition 1,742    
Gross amount at which carries at close of period [Abstract]      
Land 599    
Buildings & Improvements 9,443    
Total 10,042    
Accumulated Depreciation (6,184)    
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]      
Balance at close of year 10,042    
Deductions during year      
Balance at close of year $ 6,184    
Multi Family Same-Store | Country Meadows Apartment Homes - Billings, MT | Minimum      
Gross amount at which carries at close of period [Abstract]      
Life on which depreciation in latest income statement is computed 30 years    
Multi Family Same-Store | Country Meadows Apartment Homes - Billings, MT | Maximum      
Gross amount at which carries at close of period [Abstract]      
Life on which depreciation in latest income statement is computed 37 years    
Multi Family Same-Store | Cypress Court Apartments - St. Cloud, MN      
Real Estate And Accumulated Depreciation [Abstract]      
Encumbrances $ 11,023    
Initial Cost to Company [Abstract]      
Land 1,583    
Buildings & Improvements 18,879    
Costs capitalized subsequent to acquisition 666    
Gross amount at which carries at close of period [Abstract]      
Land 1,625    
Buildings & Improvements 19,503    
Total 21,128    
Accumulated Depreciation (6,593)    
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]      
Balance at close of year 21,128    
Deductions during year      
Balance at close of year $ 6,593    
Multi Family Same-Store | Cypress Court Apartments - St. Cloud, MN | Minimum      
Gross amount at which carries at close of period [Abstract]      
Life on which depreciation in latest income statement is computed 30 years    
Multi Family Same-Store | Cypress Court Apartments - St. Cloud, MN | Maximum      
Gross amount at which carries at close of period [Abstract]      
Life on which depreciation in latest income statement is computed 37 years    
Multi Family Same-Store | Deer Ridge Apartment Homes - Jamestown, ND      
Real Estate And Accumulated Depreciation [Abstract]      
Encumbrances $ 0    
Initial Cost to Company [Abstract]      
Land 711    
Buildings & Improvements 24,129    
Costs capitalized subsequent to acquisition 459    
Gross amount at which carries at close of period [Abstract]      
Land 785    
Buildings & Improvements 24,514    
Total 25,299    
Accumulated Depreciation (8,119)    
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]      
Balance at close of year 25,299    
Deductions during year      
Balance at close of year $ 8,119    
Multi Family Same-Store | Deer Ridge Apartment Homes - Jamestown, ND | Minimum      
Gross amount at which carries at close of period [Abstract]      
Life on which depreciation in latest income statement is computed 30 years    
Multi Family Same-Store | Deer Ridge Apartment Homes - Jamestown, ND | Maximum      
Gross amount at which carries at close of period [Abstract]      
Life on which depreciation in latest income statement is computed 37 years    
Multi Family Same-Store | Donovan Apartment Homes - Lincoln, NE      
Real Estate And Accumulated Depreciation [Abstract]      
Encumbrances $ 0    
Initial Cost to Company [Abstract]      
Land 1,515    
Buildings & Improvements 15,730    
Costs capitalized subsequent to acquisition 6,822    
Gross amount at which carries at close of period [Abstract]      
Land 1,817    
Buildings & Improvements 22,250    
Total 24,067    
Accumulated Depreciation (7,838)    
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]      
Balance at close of year 24,067    
Deductions during year      
Balance at close of year $ 7,838    
Multi Family Same-Store | Donovan Apartment Homes - Lincoln, NE | Minimum      
Gross amount at which carries at close of period [Abstract]      
Life on which depreciation in latest income statement is computed 30 years    
Multi Family Same-Store | Donovan Apartment Homes - Lincoln, NE | Maximum      
Gross amount at which carries at close of period [Abstract]      
Life on which depreciation in latest income statement is computed 37 years    
Multi Family Same-Store | Dylan at RiNo - Denver, CO      
Real Estate And Accumulated Depreciation [Abstract]      
Encumbrances $ 0    
Initial Cost to Company [Abstract]      
Land 12,155    
Buildings & Improvements 77,215    
Costs capitalized subsequent to acquisition 1,208    
Gross amount at which carries at close of period [Abstract]      
Land 12,241    
Buildings & Improvements 78,337    
Total 90,578    
Accumulated Depreciation $ (13,596)    
Life on which depreciation in latest income statement is computed 30 years    
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]      
Balance at close of year $ 90,578    
Deductions during year      
Balance at close of year 13,596    
Multi Family Same-Store | Evergreen Apartment Homes - Isanti, MN      
Real Estate And Accumulated Depreciation [Abstract]      
Encumbrances 0    
Initial Cost to Company [Abstract]      
Land 1,129    
Buildings & Improvements 5,524    
Costs capitalized subsequent to acquisition 713    
Gross amount at which carries at close of period [Abstract]      
Land 1,159    
Buildings & Improvements 6,207    
Total 7,366    
Accumulated Depreciation (2,550)    
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]      
Balance at close of year 7,366    
Deductions during year      
Balance at close of year $ 2,550    
Multi Family Same-Store | Evergreen Apartment Homes - Isanti, MN | Minimum      
Gross amount at which carries at close of period [Abstract]      
Life on which depreciation in latest income statement is computed 30 years    
Multi Family Same-Store | Evergreen Apartment Homes - Isanti, MN | Maximum      
Gross amount at which carries at close of period [Abstract]      
Life on which depreciation in latest income statement is computed 37 years    
Multi Family Same-Store | FreightYard Townhomes & Flats - Minneapolis, MN      
Real Estate And Accumulated Depreciation [Abstract]      
Encumbrances $ 0    
Initial Cost to Company [Abstract]      
Land 1,889    
Buildings & Improvements 23,616    
Costs capitalized subsequent to acquisition 1,372    
Gross amount at which carries at close of period [Abstract]      
Land 1,895    
Buildings & Improvements 24,982    
Total 26,877    
Accumulated Depreciation $ (3,031)    
Life on which depreciation in latest income statement is computed 30 years    
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]      
Balance at close of year $ 26,877    
Deductions during year      
Balance at close of year 3,031    
Multi Family Same-Store | Gardens Apartments - Grand Forks, ND      
Real Estate And Accumulated Depreciation [Abstract]      
Encumbrances 0    
Initial Cost to Company [Abstract]      
Land 518    
Buildings & Improvements 8,702    
Costs capitalized subsequent to acquisition 160    
Gross amount at which carries at close of period [Abstract]      
Land 535    
Buildings & Improvements 8,845    
Total 9,380    
Accumulated Depreciation (2,441)    
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]      
Balance at close of year 9,380    
Deductions during year      
Balance at close of year $ 2,441    
Multi Family Same-Store | Gardens Apartments - Grand Forks, ND | Minimum      
Gross amount at which carries at close of period [Abstract]      
Life on which depreciation in latest income statement is computed 30 years    
Multi Family Same-Store | Gardens Apartments - Grand Forks, ND | Maximum      
Gross amount at which carries at close of period [Abstract]      
Life on which depreciation in latest income statement is computed 37 years    
Multi Family Same-Store | Grand Gateway Apartment Homes - St. Cloud, MN      
Real Estate And Accumulated Depreciation [Abstract]      
Encumbrances $ 0    
Initial Cost to Company [Abstract]      
Land 814    
Buildings & Improvements 7,086    
Costs capitalized subsequent to acquisition 2,388    
Gross amount at which carries at close of period [Abstract]      
Land 970    
Buildings & Improvements 9,318    
Total 10,288    
Accumulated Depreciation (4,316)    
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]      
Balance at close of year 10,288    
Deductions during year      
Balance at close of year $ 4,316    
Multi Family Same-Store | Grand Gateway Apartment Homes - St. Cloud, MN | Minimum      
Gross amount at which carries at close of period [Abstract]      
Life on which depreciation in latest income statement is computed 30 years    
Multi Family Same-Store | Grand Gateway Apartment Homes - St. Cloud, MN | Maximum      
Gross amount at which carries at close of period [Abstract]      
Life on which depreciation in latest income statement is computed 37 years    
Multi Family Same-Store | Greenfield - Omaha, NE      
Real Estate And Accumulated Depreciation [Abstract]      
Encumbrances $ 0    
Initial Cost to Company [Abstract]      
Land 578    
Buildings & Improvements 4,122    
Costs capitalized subsequent to acquisition 3,241    
Gross amount at which carries at close of period [Abstract]      
Land 876    
Buildings & Improvements 7,065    
Total 7,941    
Accumulated Depreciation (3,324)    
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]      
Balance at close of year 7,941    
Deductions during year      
Balance at close of year $ 3,324    
Multi Family Same-Store | Greenfield - Omaha, NE | Minimum      
Gross amount at which carries at close of period [Abstract]      
Life on which depreciation in latest income statement is computed 30 years    
Multi Family Same-Store | Greenfield - Omaha, NE | Maximum      
Gross amount at which carries at close of period [Abstract]      
Life on which depreciation in latest income statement is computed 37 years    
Multi Family Same-Store | Homestead Garden Apartments - Rapid City, SD      
Real Estate And Accumulated Depreciation [Abstract]      
Encumbrances $ 0    
Initial Cost to Company [Abstract]      
Land 655    
Buildings & Improvements 14,139    
Costs capitalized subsequent to acquisition 1,547    
Gross amount at which carries at close of period [Abstract]      
Land 792    
Buildings & Improvements 15,549    
Total 16,341    
Accumulated Depreciation (4,560)    
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]      
Balance at close of year 16,341    
Deductions during year      
Balance at close of year $ 4,560    
Multi Family Same-Store | Homestead Garden Apartments - Rapid City, SD | Minimum      
Gross amount at which carries at close of period [Abstract]      
Life on which depreciation in latest income statement is computed 30 years    
Multi Family Same-Store | Homestead Garden Apartments - Rapid City, SD | Maximum      
Gross amount at which carries at close of period [Abstract]      
Life on which depreciation in latest income statement is computed 37 years    
Multi Family Same-Store | Ironwood - New Hope, MN      
Real Estate And Accumulated Depreciation [Abstract]      
Encumbrances $ 0    
Initial Cost to Company [Abstract]      
Land 2,165    
Buildings & Improvements 36,874    
Costs capitalized subsequent to acquisition 540    
Gross amount at which carries at close of period [Abstract]      
Land 2,167    
Buildings & Improvements 37,412    
Total 39,579    
Accumulated Depreciation $ (3,966)    
Life on which depreciation in latest income statement is computed 30 years    
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]      
Balance at close of year $ 39,579    
Deductions during year      
Balance at close of year 3,966    
Multi Family Same-Store | Lakeside Village Apartment Homes - Lincoln, NE      
Real Estate And Accumulated Depreciation [Abstract]      
Encumbrances 0    
Initial Cost to Company [Abstract]      
Land 1,215    
Buildings & Improvements 15,837    
Costs capitalized subsequent to acquisition 5,069    
Gross amount at which carries at close of period [Abstract]      
Land 1,476    
Buildings & Improvements 20,645    
Total 22,121    
Accumulated Depreciation (7,156)    
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]      
Balance at close of year 22,121    
Deductions during year      
Balance at close of year $ 7,156    
Multi Family Same-Store | Lakeside Village Apartment Homes - Lincoln, NE | Minimum      
Gross amount at which carries at close of period [Abstract]      
Life on which depreciation in latest income statement is computed 30 years    
Multi Family Same-Store | Lakeside Village Apartment Homes - Lincoln, NE | Maximum      
Gross amount at which carries at close of period [Abstract]      
Life on which depreciation in latest income statement is computed 37 years    
Multi Family Same-Store | Legacy Apartments - Grand Forks, ND      
Real Estate And Accumulated Depreciation [Abstract]      
Encumbrances $ 0    
Initial Cost to Company [Abstract]      
Land 1,362    
Buildings & Improvements 21,727    
Costs capitalized subsequent to acquisition 11,036    
Gross amount at which carries at close of period [Abstract]      
Land 2,474    
Buildings & Improvements 31,651    
Total 34,125    
Accumulated Depreciation (20,814)    
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]      
Balance at close of year 34,125    
Deductions during year      
Balance at close of year $ 20,814    
Multi Family Same-Store | Legacy Apartments - Grand Forks, ND | Minimum      
Gross amount at which carries at close of period [Abstract]      
Life on which depreciation in latest income statement is computed 30 years    
Multi Family Same-Store | Legacy Apartments - Grand Forks, ND | Maximum      
Gross amount at which carries at close of period [Abstract]      
Life on which depreciation in latest income statement is computed 37 years    
Multi Family Same-Store | Legacy Heights Apartment Homes - Bismarck, ND      
Real Estate And Accumulated Depreciation [Abstract]      
Encumbrances $ 0    
Initial Cost to Company [Abstract]      
Land 1,207    
Buildings & Improvements 13,742    
Costs capitalized subsequent to acquisition 399    
Gross amount at which carries at close of period [Abstract]      
Land 1,142    
Buildings & Improvements 14,206    
Total 15,348    
Accumulated Depreciation (3,592)    
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]      
Balance at close of year 15,348    
Deductions during year      
Balance at close of year $ 3,592    
Multi Family Same-Store | Legacy Heights Apartment Homes - Bismarck, ND | Minimum      
Gross amount at which carries at close of period [Abstract]      
Life on which depreciation in latest income statement is computed 30 years    
Multi Family Same-Store | Legacy Heights Apartment Homes - Bismarck, ND | Maximum      
Gross amount at which carries at close of period [Abstract]      
Life on which depreciation in latest income statement is computed 37 years    
Multi Family Same-Store | Lugano at Cherry Creek - Denver, CO      
Real Estate And Accumulated Depreciation [Abstract]      
Encumbrances $ 0    
Initial Cost to Company [Abstract]      
Land 7,679    
Buildings & Improvements 87,766    
Costs capitalized subsequent to acquisition 3,577    
Gross amount at which carries at close of period [Abstract]      
Land 7,679    
Buildings & Improvements 91,343    
Total 99,022    
Accumulated Depreciation $ (11,223)    
Life on which depreciation in latest income statement is computed 30 years    
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]      
Balance at close of year $ 99,022    
Deductions during year      
Balance at close of year 11,223    
Multi Family Same-Store | Meadows Apartments - Jamestown, ND      
Real Estate And Accumulated Depreciation [Abstract]      
Encumbrances 0    
Initial Cost to Company [Abstract]      
Land 590    
Buildings & Improvements 4,519    
Costs capitalized subsequent to acquisition 2,103    
Gross amount at which carries at close of period [Abstract]      
Land 730    
Buildings & Improvements 6,482    
Total 7,212    
Accumulated Depreciation (4,287)    
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]      
Balance at close of year 7,212    
Deductions during year      
Balance at close of year $ 4,287    
Multi Family Same-Store | Meadows Apartments - Jamestown, ND | Minimum      
Gross amount at which carries at close of period [Abstract]      
Life on which depreciation in latest income statement is computed 30 years    
Multi Family Same-Store | Meadows Apartments - Jamestown, ND | Maximum      
Gross amount at which carries at close of period [Abstract]      
Life on which depreciation in latest income statement is computed 37 years    
Multi Family Same-Store | Monticello Crossings - Monticello, MN      
Real Estate And Accumulated Depreciation [Abstract]      
Encumbrances $ 0    
Initial Cost to Company [Abstract]      
Land 1,734    
Buildings & Improvements 30,136    
Costs capitalized subsequent to acquisition 631    
Gross amount at which carries at close of period [Abstract]      
Land 1,951    
Buildings & Improvements 30,550    
Total 32,501    
Accumulated Depreciation (7,538)    
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]      
Balance at close of year 32,501    
Deductions during year      
Balance at close of year $ 7,538    
Multi Family Same-Store | Monticello Crossings - Monticello, MN | Minimum      
Gross amount at which carries at close of period [Abstract]      
Life on which depreciation in latest income statement is computed 30 years    
Multi Family Same-Store | Monticello Crossings - Monticello, MN | Maximum      
Gross amount at which carries at close of period [Abstract]      
Life on which depreciation in latest income statement is computed 37 years    
Multi Family Same-Store | Monticello Village - Monticello, MN      
Real Estate And Accumulated Depreciation [Abstract]      
Encumbrances $ 0    
Initial Cost to Company [Abstract]      
Land 490    
Buildings & Improvements 3,756    
Costs capitalized subsequent to acquisition 1,263    
Gross amount at which carries at close of period [Abstract]      
Land 655    
Buildings & Improvements 4,854    
Total 5,509    
Accumulated Depreciation (2,865)    
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]      
Balance at close of year 5,509    
Deductions during year      
Balance at close of year $ 2,865    
Multi Family Same-Store | Monticello Village - Monticello, MN | Minimum      
Gross amount at which carries at close of period [Abstract]      
Life on which depreciation in latest income statement is computed 30 years    
Multi Family Same-Store | Monticello Village - Monticello, MN | Maximum      
Gross amount at which carries at close of period [Abstract]      
Life on which depreciation in latest income statement is computed 37 years    
Multi Family Same-Store | Northridge Apartments - Bismarck, ND      
Real Estate And Accumulated Depreciation [Abstract]      
Encumbrances $ 0    
Initial Cost to Company [Abstract]      
Land 884    
Buildings & Improvements 7,515    
Costs capitalized subsequent to acquisition 266    
Gross amount at which carries at close of period [Abstract]      
Land 1,048    
Buildings & Improvements 7,617    
Total 8,665    
Accumulated Depreciation (2,182)    
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]      
Balance at close of year 8,665    
Deductions during year      
Balance at close of year $ 2,182    
Multi Family Same-Store | Northridge Apartments - Bismarck, ND | Minimum      
Gross amount at which carries at close of period [Abstract]      
Life on which depreciation in latest income statement is computed 30 years    
Multi Family Same-Store | Northridge Apartments - Bismarck, ND | Maximum      
Gross amount at which carries at close of period [Abstract]      
Life on which depreciation in latest income statement is computed 37 years    
Multi Family Same-Store | Olympic Village Apartments - Billings, MT      
Real Estate And Accumulated Depreciation [Abstract]      
Encumbrances $ 0    
Initial Cost to Company [Abstract]      
Land 1,164    
Buildings & Improvements 10,441    
Costs capitalized subsequent to acquisition 4,464    
Gross amount at which carries at close of period [Abstract]      
Land 1,885    
Buildings & Improvements 14,184    
Total 16,069    
Accumulated Depreciation (9,160)    
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]      
Balance at close of year 16,069    
Deductions during year      
Balance at close of year $ 9,160    
Multi Family Same-Store | Olympic Village Apartments - Billings, MT | Minimum      
Gross amount at which carries at close of period [Abstract]      
Life on which depreciation in latest income statement is computed 30 years    
Multi Family Same-Store | Olympic Village Apartments - Billings, MT | Maximum      
Gross amount at which carries at close of period [Abstract]      
Life on which depreciation in latest income statement is computed 37 years    
Multi Family Same-Store | Oxbo Urban Rentals - St Paul, MN      
Real Estate And Accumulated Depreciation [Abstract]      
Encumbrances $ 0    
Initial Cost to Company [Abstract]      
Land 5,809    
Buildings & Improvements 51,586    
Costs capitalized subsequent to acquisition 565    
Gross amount at which carries at close of period [Abstract]      
Land 5,822    
Buildings & Improvements 52,138    
Total 57,960    
Accumulated Depreciation $ (10,412)    
Life on which depreciation in latest income statement is computed 30 years    
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]      
Balance at close of year $ 57,960    
Deductions during year      
Balance at close of year 10,412    
Multi Family Same-Store | Park Meadows Apartment Homes - Waite Park, MN      
Real Estate And Accumulated Depreciation [Abstract]      
Encumbrances 0    
Initial Cost to Company [Abstract]      
Land 1,143    
Buildings & Improvements 9,099    
Costs capitalized subsequent to acquisition 10,149    
Gross amount at which carries at close of period [Abstract]      
Land 2,140    
Buildings & Improvements 18,251    
Total 20,391    
Accumulated Depreciation (13,904)    
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]      
Balance at close of year 20,391    
Deductions during year      
Balance at close of year $ 13,904    
Multi Family Same-Store | Park Meadows Apartment Homes - Waite Park, MN | Minimum      
Gross amount at which carries at close of period [Abstract]      
Life on which depreciation in latest income statement is computed 30 years    
Multi Family Same-Store | Park Meadows Apartment Homes - Waite Park, MN | Maximum      
Gross amount at which carries at close of period [Abstract]      
Life on which depreciation in latest income statement is computed 37 years    
Multi Family Same-Store | Park Place Apartments - Plymouth, MN      
Real Estate And Accumulated Depreciation [Abstract]      
Encumbrances $ 0    
Initial Cost to Company [Abstract]      
Land 10,609    
Buildings & Improvements 80,781    
Costs capitalized subsequent to acquisition 19,032    
Gross amount at which carries at close of period [Abstract]      
Land 10,819    
Buildings & Improvements 99,603    
Total 110,422    
Accumulated Depreciation $ (21,002)    
Life on which depreciation in latest income statement is computed 30 years    
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]      
Balance at close of year $ 110,422    
Deductions during year      
Balance at close of year 21,002    
Multi Family Same-Store | Parkhouse Apartment Homes - Thornton, CO      
Real Estate And Accumulated Depreciation [Abstract]      
Encumbrances 0    
Initial Cost to Company [Abstract]      
Land 10,474    
Buildings & Improvements 132,105    
Costs capitalized subsequent to acquisition 1,583    
Gross amount at which carries at close of period [Abstract]      
Land 10,484    
Buildings & Improvements 133,678    
Total 144,162    
Accumulated Depreciation $ (12,245)    
Life on which depreciation in latest income statement is computed 30 years    
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]      
Balance at close of year $ 144,162    
Deductions during year      
Balance at close of year 12,245    
Multi Family Same-Store | Plaza Apartments - Minot, ND      
Real Estate And Accumulated Depreciation [Abstract]      
Encumbrances 0    
Initial Cost to Company [Abstract]      
Land 867    
Buildings & Improvements 12,784    
Costs capitalized subsequent to acquisition 3,160    
Gross amount at which carries at close of period [Abstract]      
Land 1,011    
Buildings & Improvements 15,800    
Total 16,811    
Accumulated Depreciation (6,823)    
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]      
Balance at close of year 16,811    
Deductions during year      
Balance at close of year $ 6,823    
Multi Family Same-Store | Plaza Apartments - Minot, ND | Minimum      
Gross amount at which carries at close of period [Abstract]      
Life on which depreciation in latest income statement is computed 30 years    
Multi Family Same-Store | Plaza Apartments - Minot, ND | Maximum      
Gross amount at which carries at close of period [Abstract]      
Life on which depreciation in latest income statement is computed 37 years    
Multi Family Same-Store | Pointe West Apartments - Rapid City, SD      
Real Estate And Accumulated Depreciation [Abstract]      
Encumbrances $ 0    
Initial Cost to Company [Abstract]      
Land 240    
Buildings & Improvements 3,538    
Costs capitalized subsequent to acquisition 2,299    
Gross amount at which carries at close of period [Abstract]      
Land 463    
Buildings & Improvements 5,614    
Total 6,077    
Accumulated Depreciation (4,303)    
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]      
Balance at close of year 6,077    
Deductions during year      
Balance at close of year $ 4,303    
Multi Family Same-Store | Pointe West Apartments - Rapid City, SD | Minimum      
Gross amount at which carries at close of period [Abstract]      
Life on which depreciation in latest income statement is computed 30 years    
Multi Family Same-Store | Pointe West Apartments - Rapid City, SD | Maximum      
Gross amount at which carries at close of period [Abstract]      
Life on which depreciation in latest income statement is computed 37 years    
Multi Family Same-Store | Ponds at Heritage Place - Sartell, MN      
Real Estate And Accumulated Depreciation [Abstract]      
Encumbrances $ 0    
Initial Cost to Company [Abstract]      
Land 395    
Buildings & Improvements 4,564    
Costs capitalized subsequent to acquisition 566    
Gross amount at which carries at close of period [Abstract]      
Land 419    
Buildings & Improvements 5,106    
Total 5,525    
Accumulated Depreciation (1,993)    
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]      
Balance at close of year 5,525    
Deductions during year      
Balance at close of year $ 1,993    
Multi Family Same-Store | Ponds at Heritage Place - Sartell, MN | Minimum      
Gross amount at which carries at close of period [Abstract]      
Life on which depreciation in latest income statement is computed 30 years    
Multi Family Same-Store | Ponds at Heritage Place - Sartell, MN | Maximum      
Gross amount at which carries at close of period [Abstract]      
Life on which depreciation in latest income statement is computed 37 years    
Multi Family Same-Store | Prosper West - Waite Park, MN      
Real Estate And Accumulated Depreciation [Abstract]      
Encumbrances $ 16,425    
Initial Cost to Company [Abstract]      
Land 939    
Buildings & Improvements 10,167    
Costs capitalized subsequent to acquisition 17,243    
Gross amount at which carries at close of period [Abstract]      
Land 1,912    
Buildings & Improvements 26,437    
Total 28,349    
Accumulated Depreciation (14,646)    
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]      
Balance at close of year 28,349    
Deductions during year      
Balance at close of year $ 14,646    
Multi Family Same-Store | Prosper West - Waite Park, MN | Minimum      
Gross amount at which carries at close of period [Abstract]      
Life on which depreciation in latest income statement is computed 30 years    
Multi Family Same-Store | Prosper West - Waite Park, MN | Maximum      
Gross amount at which carries at close of period [Abstract]      
Life on which depreciation in latest income statement is computed 37 years    
Multi Family Same-Store | Quarry Ridge Apartments - Rochester, MN      
Real Estate And Accumulated Depreciation [Abstract]      
Encumbrances $ 22,733    
Initial Cost to Company [Abstract]      
Land 2,254    
Buildings & Improvements 30,024    
Costs capitalized subsequent to acquisition 8,777    
Gross amount at which carries at close of period [Abstract]      
Land 2,412    
Buildings & Improvements 38,643    
Total 41,055    
Accumulated Depreciation (14,145)    
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]      
Balance at close of year 41,055    
Deductions during year      
Balance at close of year $ 14,145    
Multi Family Same-Store | Quarry Ridge Apartments - Rochester, MN | Minimum      
Gross amount at which carries at close of period [Abstract]      
Life on which depreciation in latest income statement is computed 30 years    
Multi Family Same-Store | Quarry Ridge Apartments - Rochester, MN | Maximum      
Gross amount at which carries at close of period [Abstract]      
Life on which depreciation in latest income statement is computed 37 years    
Multi Family Same-Store | Red 20 Apartments - Minneapolis, MN      
Real Estate And Accumulated Depreciation [Abstract]      
Encumbrances $ 20,256    
Initial Cost to Company [Abstract]      
Land 1,900    
Buildings & Improvements 24,116    
Costs capitalized subsequent to acquisition 758    
Gross amount at which carries at close of period [Abstract]      
Land 1,908    
Buildings & Improvements 24,866    
Total 26,774    
Accumulated Depreciation (8,313)    
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]      
Balance at close of year 26,774    
Deductions during year      
Balance at close of year $ 8,313    
Multi Family Same-Store | Red 20 Apartments - Minneapolis, MN | Minimum      
Gross amount at which carries at close of period [Abstract]      
Life on which depreciation in latest income statement is computed 30 years    
Multi Family Same-Store | Red 20 Apartments - Minneapolis, MN | Maximum      
Gross amount at which carries at close of period [Abstract]      
Life on which depreciation in latest income statement is computed 37 years    
Multi Family Same-Store | Regency Park Estates - St. Cloud, MN      
Real Estate And Accumulated Depreciation [Abstract]      
Encumbrances $ 6,923    
Initial Cost to Company [Abstract]      
Land 702    
Buildings & Improvements 10,198    
Costs capitalized subsequent to acquisition 8,040    
Gross amount at which carries at close of period [Abstract]      
Land 1,179    
Buildings & Improvements 17,761    
Total 18,940    
Accumulated Depreciation (6,476)    
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]      
Balance at close of year 18,940    
Deductions during year      
Balance at close of year $ 6,476    
Multi Family Same-Store | Regency Park Estates - St. Cloud, MN | Minimum      
Gross amount at which carries at close of period [Abstract]      
Life on which depreciation in latest income statement is computed 30 years    
Multi Family Same-Store | Regency Park Estates - St. Cloud, MN | Maximum      
Gross amount at which carries at close of period [Abstract]      
Life on which depreciation in latest income statement is computed 37 years    
Multi Family Same-Store | Rimrock West Apartments - Billings, MT      
Real Estate And Accumulated Depreciation [Abstract]      
Encumbrances $ 0    
Initial Cost to Company [Abstract]      
Land 330    
Buildings & Improvements 3,489    
Costs capitalized subsequent to acquisition 2,102    
Gross amount at which carries at close of period [Abstract]      
Land 568    
Buildings & Improvements 5,353    
Total 5,921    
Accumulated Depreciation (3,623)    
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]      
Balance at close of year 5,921    
Deductions during year      
Balance at close of year $ 3,623    
Multi Family Same-Store | Rimrock West Apartments - Billings, MT | Minimum      
Gross amount at which carries at close of period [Abstract]      
Life on which depreciation in latest income statement is computed 30 years    
Multi Family Same-Store | Rimrock West Apartments - Billings, MT | Maximum      
Gross amount at which carries at close of period [Abstract]      
Life on which depreciation in latest income statement is computed 37 years    
Multi Family Same-Store | River Ridge Apartment Homes - Bismarck, ND      
Real Estate And Accumulated Depreciation [Abstract]      
Encumbrances $ 0    
Initial Cost to Company [Abstract]      
Land 576    
Buildings & Improvements 24,670    
Costs capitalized subsequent to acquisition 1,214    
Gross amount at which carries at close of period [Abstract]      
Land 922    
Buildings & Improvements 25,538    
Total 26,460    
Accumulated Depreciation (9,992)    
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]      
Balance at close of year 26,460    
Deductions during year      
Balance at close of year $ 9,992    
Multi Family Same-Store | River Ridge Apartment Homes - Bismarck, ND | Minimum      
Gross amount at which carries at close of period [Abstract]      
Life on which depreciation in latest income statement is computed 30 years    
Multi Family Same-Store | River Ridge Apartment Homes - Bismarck, ND | Maximum      
Gross amount at which carries at close of period [Abstract]      
Life on which depreciation in latest income statement is computed 37 years    
Multi Family Same-Store | Rocky Meadows Apartments - Billings, MT      
Real Estate And Accumulated Depreciation [Abstract]      
Encumbrances $ 0    
Initial Cost to Company [Abstract]      
Land 656    
Buildings & Improvements 5,726    
Costs capitalized subsequent to acquisition 1,732    
Gross amount at which carries at close of period [Abstract]      
Land 840    
Buildings & Improvements 7,274    
Total 8,114    
Accumulated Depreciation (5,084)    
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]      
Balance at close of year 8,114    
Deductions during year      
Balance at close of year $ 5,084    
Multi Family Same-Store | Rocky Meadows Apartments - Billings, MT | Minimum      
Gross amount at which carries at close of period [Abstract]      
Life on which depreciation in latest income statement is computed 30 years    
Multi Family Same-Store | Rocky Meadows Apartments - Billings, MT | Maximum      
Gross amount at which carries at close of period [Abstract]      
Life on which depreciation in latest income statement is computed 37 years    
Multi Family Same-Store | Rum River Apartments - Isanti, MN      
Real Estate And Accumulated Depreciation [Abstract]      
Encumbrances $ 0    
Initial Cost to Company [Abstract]      
Land 843    
Buildings & Improvements 4,823    
Costs capitalized subsequent to acquisition 542    
Gross amount at which carries at close of period [Abstract]      
Land 870    
Buildings & Improvements 5,338    
Total 6,208    
Accumulated Depreciation (2,591)    
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]      
Balance at close of year 6,208    
Deductions during year      
Balance at close of year $ 2,591    
Multi Family Same-Store | Rum River Apartments - Isanti, MN | Minimum      
Gross amount at which carries at close of period [Abstract]      
Life on which depreciation in latest income statement is computed 30 years    
Multi Family Same-Store | Rum River Apartments - Isanti, MN | Maximum      
Gross amount at which carries at close of period [Abstract]      
Life on which depreciation in latest income statement is computed 37 years    
Multi Family Same-Store | Silver Springs Apartment Homes - Rapid City, SD      
Real Estate And Accumulated Depreciation [Abstract]      
Encumbrances $ 0    
Initial Cost to Company [Abstract]      
Land 215    
Buildings & Improvements 3,007    
Costs capitalized subsequent to acquisition 1,116    
Gross amount at which carries at close of period [Abstract]      
Land 273    
Buildings & Improvements 4,065    
Total 4,338    
Accumulated Depreciation (1,319)    
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]      
Balance at close of year 4,338    
Deductions during year      
Balance at close of year $ 1,319    
Multi Family Same-Store | Silver Springs Apartment Homes - Rapid City, SD | Minimum      
Gross amount at which carries at close of period [Abstract]      
Life on which depreciation in latest income statement is computed 30 years    
Multi Family Same-Store | Silver Springs Apartment Homes - Rapid City, SD | Maximum      
Gross amount at which carries at close of period [Abstract]      
Life on which depreciation in latest income statement is computed 37 years    
Multi Family Same-Store | South Pointe Apartment Homes - Minot, ND      
Real Estate And Accumulated Depreciation [Abstract]      
Encumbrances $ 0    
Initial Cost to Company [Abstract]      
Land 550    
Buildings & Improvements 9,548    
Costs capitalized subsequent to acquisition 6,374    
Gross amount at which carries at close of period [Abstract]      
Land 1,489    
Buildings & Improvements 14,983    
Total 16,472    
Accumulated Depreciation (11,368)    
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]      
Balance at close of year 16,472    
Deductions during year      
Balance at close of year $ 11,368    
Multi Family Same-Store | South Pointe Apartment Homes - Minot, ND | Minimum      
Gross amount at which carries at close of period [Abstract]      
Life on which depreciation in latest income statement is computed 30 years    
Multi Family Same-Store | South Pointe Apartment Homes - Minot, ND | Maximum      
Gross amount at which carries at close of period [Abstract]      
Life on which depreciation in latest income statement is computed 37 years    
Multi Family Same-Store | SouthFork Townhomes + Flats - Lakeville, MN      
Real Estate And Accumulated Depreciation [Abstract]      
Encumbrances $ 21,675    
Initial Cost to Company [Abstract]      
Land 3,502    
Buildings & Improvements 40,153    
Costs capitalized subsequent to acquisition 11,146    
Gross amount at which carries at close of period [Abstract]      
Land 3,583    
Buildings & Improvements 51,218    
Total 54,801    
Accumulated Depreciation $ (9,354)    
Life on which depreciation in latest income statement is computed 30 years    
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]      
Balance at close of year $ 54,801    
Deductions during year      
Balance at close of year 9,354    
Multi Family Same-Store | Southpoint Apartments - Grand Forks, ND      
Real Estate And Accumulated Depreciation [Abstract]      
Encumbrances 0    
Initial Cost to Company [Abstract]      
Land 576    
Buildings & Improvements 9,893    
Costs capitalized subsequent to acquisition 444    
Gross amount at which carries at close of period [Abstract]      
Land 663    
Buildings & Improvements 10,250    
Total 10,913    
Accumulated Depreciation (3,098)    
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]      
Balance at close of year 10,913    
Deductions during year      
Balance at close of year $ 3,098    
Multi Family Same-Store | Southpoint Apartments - Grand Forks, ND | Minimum      
Gross amount at which carries at close of period [Abstract]      
Life on which depreciation in latest income statement is computed 30 years    
Multi Family Same-Store | Southpoint Apartments - Grand Forks, ND | Maximum      
Gross amount at which carries at close of period [Abstract]      
Life on which depreciation in latest income statement is computed 37 years    
Multi Family Same-Store | Sunset Trail Apartment Homes - Rochester, MN      
Real Estate And Accumulated Depreciation [Abstract]      
Encumbrances $ 0    
Initial Cost to Company [Abstract]      
Land 336    
Buildings & Improvements 12,814    
Costs capitalized subsequent to acquisition 3,621    
Gross amount at which carries at close of period [Abstract]      
Land 826    
Buildings & Improvements 15,945    
Total 16,771    
Accumulated Depreciation (10,109)    
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]      
Balance at close of year 16,771    
Deductions during year      
Balance at close of year $ 10,109    
Multi Family Same-Store | Sunset Trail Apartment Homes - Rochester, MN | Minimum      
Gross amount at which carries at close of period [Abstract]      
Life on which depreciation in latest income statement is computed 30 years    
Multi Family Same-Store | Sunset Trail Apartment Homes - Rochester, MN | Maximum      
Gross amount at which carries at close of period [Abstract]      
Life on which depreciation in latest income statement is computed 37 years    
Multi Family Same-Store | Thomasbrook Apartment - Lincoln, NE      
Real Estate And Accumulated Depreciation [Abstract]      
Encumbrances $ 13,100    
Initial Cost to Company [Abstract]      
Land 600    
Buildings & Improvements 10,306    
Costs capitalized subsequent to acquisition 6,391    
Gross amount at which carries at close of period [Abstract]      
Land 1,710    
Buildings & Improvements 15,587    
Total 17,297    
Accumulated Depreciation (9,677)    
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]      
Balance at close of year 17,297    
Deductions during year      
Balance at close of year $ 9,677    
Multi Family Same-Store | Thomasbrook Apartment - Lincoln, NE | Minimum      
Gross amount at which carries at close of period [Abstract]      
Life on which depreciation in latest income statement is computed 30 years    
Multi Family Same-Store | Thomasbrook Apartment - Lincoln, NE | Maximum      
Gross amount at which carries at close of period [Abstract]      
Life on which depreciation in latest income statement is computed 37 years    
Multi Family Same-Store | Westend - Denver, CO      
Real Estate And Accumulated Depreciation [Abstract]      
Encumbrances $ 0    
Initial Cost to Company [Abstract]      
Land 25,525    
Buildings & Improvements 102,180    
Costs capitalized subsequent to acquisition 1,270    
Gross amount at which carries at close of period [Abstract]      
Land 25,532    
Buildings & Improvements 103,443    
Total 128,975    
Accumulated Depreciation $ (17,153)    
Life on which depreciation in latest income statement is computed 30 years    
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]      
Balance at close of year $ 128,975    
Deductions during year      
Balance at close of year 17,153    
Multi Family Same-Store | Whispering Ridge - Omaha, NE      
Real Estate And Accumulated Depreciation [Abstract]      
Encumbrances 18,691    
Initial Cost to Company [Abstract]      
Land 2,139    
Buildings & Improvements 25,424    
Costs capitalized subsequent to acquisition 5,780    
Gross amount at which carries at close of period [Abstract]      
Land 2,551    
Buildings & Improvements 30,792    
Total 33,343    
Accumulated Depreciation (10,636)    
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]      
Balance at close of year 33,343    
Deductions during year      
Balance at close of year $ 10,636    
Multi Family Same-Store | Whispering Ridge - Omaha, NE | Minimum      
Gross amount at which carries at close of period [Abstract]      
Life on which depreciation in latest income statement is computed 30 years    
Multi Family Same-Store | Whispering Ridge - Omaha, NE | Maximum      
Gross amount at which carries at close of period [Abstract]      
Life on which depreciation in latest income statement is computed 37 years    
Multi Family Same-Store | Woodridge on Second - Rochester, MN      
Real Estate And Accumulated Depreciation [Abstract]      
Encumbrances $ 0    
Initial Cost to Company [Abstract]      
Land 370    
Buildings & Improvements 6,028    
Costs capitalized subsequent to acquisition 6,373    
Gross amount at which carries at close of period [Abstract]      
Land 761    
Buildings & Improvements 12,010    
Total 12,771    
Accumulated Depreciation (7,328)    
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]      
Balance at close of year 12,771    
Deductions during year      
Balance at close of year $ 7,328    
Multi Family Same-Store | Woodridge on Second - Rochester, MN | Minimum      
Gross amount at which carries at close of period [Abstract]      
Life on which depreciation in latest income statement is computed 30 years    
Multi Family Same-Store | Woodridge on Second - Rochester, MN | Maximum      
Gross amount at which carries at close of period [Abstract]      
Life on which depreciation in latest income statement is computed 37 years    
MultiFamily Non-Same-Store      
Real Estate And Accumulated Depreciation [Abstract]      
Encumbrances $ 262,718    
Initial Cost to Company [Abstract]      
Land 65,558    
Buildings & Improvements 623,230    
Costs capitalized subsequent to acquisition 24,116    
Gross amount at which carries at close of period [Abstract]      
Land 66,562    
Buildings & Improvements 646,342    
Total 712,904    
Accumulated Depreciation (29,868)    
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]      
Balance at close of year 712,904    
Deductions during year      
Balance at close of year 29,868    
MultiFamily Non-Same-Store | Bayberry Place - Eagan, MN      
Real Estate And Accumulated Depreciation [Abstract]      
Encumbrances 11,048    
Initial Cost to Company [Abstract]      
Land 1,807    
Buildings & Improvements 14,113    
Costs capitalized subsequent to acquisition 801    
Gross amount at which carries at close of period [Abstract]      
Land 1,865    
Buildings & Improvements 14,856    
Total 16,721    
Accumulated Depreciation $ (736)    
Life on which depreciation in latest income statement is computed 30 years    
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]      
Balance at close of year $ 16,721    
Deductions during year      
Balance at close of year 736    
MultiFamily Non-Same-Store | Burgandy & Hillsboro - New Hope, MN      
Real Estate And Accumulated Depreciation [Abstract]      
Encumbrances 23,570    
Initial Cost to Company [Abstract]      
Land 2,834    
Buildings & Improvements 31,149    
Costs capitalized subsequent to acquisition 1,816    
Gross amount at which carries at close of period [Abstract]      
Land 2,913    
Buildings & Improvements 32,886    
Total 35,799    
Accumulated Depreciation $ (1,686)    
Life on which depreciation in latest income statement is computed 30 years    
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]      
Balance at close of year $ 35,799    
Deductions during year      
Balance at close of year 1,686    
MultiFamily Non-Same-Store | Civic Lofts - Denver, CO      
Real Estate And Accumulated Depreciation [Abstract]      
Encumbrances 0    
Initial Cost to Company [Abstract]      
Land 6,166    
Buildings & Improvements 55,182    
Costs capitalized subsequent to acquisition 172    
Gross amount at which carries at close of period [Abstract]      
Land 6,171    
Buildings & Improvements 55,349    
Total 61,520    
Accumulated Depreciation $ (2,318)    
Life on which depreciation in latest income statement is computed 30 years    
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]      
Balance at close of year $ 61,520    
Deductions during year      
Balance at close of year 2,318    
MultiFamily Non-Same-Store | Elements of Linden Hills - Minneapolis, MN      
Real Estate And Accumulated Depreciation [Abstract]      
Encumbrances 5,969    
Initial Cost to Company [Abstract]      
Land 941    
Buildings & Improvements 7,853    
Costs capitalized subsequent to acquisition 178    
Gross amount at which carries at close of period [Abstract]      
Land 949    
Buildings & Improvements 8,023    
Total 8,972    
Accumulated Depreciation $ (332)    
Life on which depreciation in latest income statement is computed 30 years    
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]      
Balance at close of year $ 8,972    
Deductions during year      
Balance at close of year 332    
MultiFamily Non-Same-Store | Gatewood - Waite Park, MN      
Real Estate And Accumulated Depreciation [Abstract]      
Encumbrances 5,156    
Initial Cost to Company [Abstract]      
Land 327    
Buildings & Improvements 6,858    
Costs capitalized subsequent to acquisition 808    
Gross amount at which carries at close of period [Abstract]      
Land 342    
Buildings & Improvements 7,651    
Total 7,993    
Accumulated Depreciation $ (428)    
Life on which depreciation in latest income statement is computed 30 years    
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]      
Balance at close of year $ 7,993    
Deductions during year      
Balance at close of year 428    
MultiFamily Non-Same-Store | Grove Ridge - Cottage Grove, MN      
Real Estate And Accumulated Depreciation [Abstract]      
Encumbrances 7,992    
Initial Cost to Company [Abstract]      
Land 1,250    
Buildings & Improvements 10,271    
Costs capitalized subsequent to acquisition 551    
Gross amount at which carries at close of period [Abstract]      
Land 1,293    
Buildings & Improvements 10,779    
Total 12,072    
Accumulated Depreciation $ (546)    
Life on which depreciation in latest income statement is computed 30 years    
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]      
Balance at close of year $ 12,072    
Deductions during year      
Balance at close of year 546    
MultiFamily Non-Same-Store | Legacy Waite Park - Waite Park, MN      
Real Estate And Accumulated Depreciation [Abstract]      
Encumbrances 6,923    
Initial Cost to Company [Abstract]      
Land 412    
Buildings & Improvements 9,556    
Costs capitalized subsequent to acquisition 1,008    
Gross amount at which carries at close of period [Abstract]      
Land 426    
Buildings & Improvements 10,550    
Total 10,976    
Accumulated Depreciation $ (580)    
Life on which depreciation in latest income statement is computed 30 years    
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]      
Balance at close of year $ 10,976    
Deductions during year      
Balance at close of year 580    
MultiFamily Non-Same-Store | Lyra Apartments - Centennial, CO      
Real Estate And Accumulated Depreciation [Abstract]      
Encumbrances 0    
Initial Cost to Company [Abstract]      
Land 6,473    
Buildings & Improvements 86,149    
Costs capitalized subsequent to acquisition 163    
Gross amount at which carries at close of period [Abstract]      
Land 6,481    
Buildings & Improvements 86,304    
Total 92,785    
Accumulated Depreciation $ (1,123)    
Life on which depreciation in latest income statement is computed 30 years    
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]      
Balance at close of year $ 92,785    
Deductions during year      
Balance at close of year 1,123    
MultiFamily Non-Same-Store | Martin Blu - Eden Prairie, MN      
Real Estate And Accumulated Depreciation [Abstract]      
Encumbrances 27,939    
Initial Cost to Company [Abstract]      
Land 3,547    
Buildings & Improvements 45,212    
Costs capitalized subsequent to acquisition 323    
Gross amount at which carries at close of period [Abstract]      
Land 3,560    
Buildings & Improvements 45,522    
Total 49,082    
Accumulated Depreciation $ (1,854)    
Life on which depreciation in latest income statement is computed 30 years    
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]      
Balance at close of year $ 49,082    
Deductions during year      
Balance at close of year 1,854    
MultiFamily Non-Same-Store | New Hope Garden & Village - New Hope, MN      
Real Estate And Accumulated Depreciation [Abstract]      
Encumbrances 9,943    
Initial Cost to Company [Abstract]      
Land 1,603    
Buildings & Improvements 12,578    
Costs capitalized subsequent to acquisition 1,032    
Gross amount at which carries at close of period [Abstract]      
Land 1,651    
Buildings & Improvements 13,562    
Total 15,213    
Accumulated Depreciation $ (742)    
Life on which depreciation in latest income statement is computed 30 years    
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]      
Balance at close of year $ 15,213    
Deductions during year      
Balance at close of year 742    
MultiFamily Non-Same-Store | Noko Apartments - Minneapolis, MN      
Real Estate And Accumulated Depreciation [Abstract]      
Encumbrances 0    
Initial Cost to Company [Abstract]      
Land 1,915    
Buildings & Improvements 42,636    
Costs capitalized subsequent to acquisition 98    
Gross amount at which carries at close of period [Abstract]      
Land 1,918    
Buildings & Improvements 42,731    
Total 44,649    
Accumulated Depreciation $ (1,690)    
Life on which depreciation in latest income statement is computed 30 years    
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]      
Balance at close of year $ 44,649    
Deductions during year      
Balance at close of year 1,690    
MultiFamily Non-Same-Store | Palisades - Roseville, MN      
Real Estate And Accumulated Depreciation [Abstract]      
Encumbrances 22,048    
Initial Cost to Company [Abstract]      
Land 6,919    
Buildings & Improvements 46,577    
Costs capitalized subsequent to acquisition 1,010    
Gross amount at which carries at close of period [Abstract]      
Land 6,959    
Buildings & Improvements 47,547    
Total 54,506    
Accumulated Depreciation $ (2,360)    
Life on which depreciation in latest income statement is computed 30 years    
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]      
Balance at close of year $ 54,506    
Deductions during year      
Balance at close of year 2,360    
MultiFamily Non-Same-Store | Plymouth Pointe - Plymouth, MN      
Real Estate And Accumulated Depreciation [Abstract]      
Encumbrances 9,575    
Initial Cost to Company [Abstract]      
Land 1,042    
Buildings & Improvements 12,810    
Costs capitalized subsequent to acquisition 801    
Gross amount at which carries at close of period [Abstract]      
Land 1,073    
Buildings & Improvements 13,580    
Total 14,653    
Accumulated Depreciation $ (723)    
Life on which depreciation in latest income statement is computed 30 years    
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]      
Balance at close of year $ 14,653    
Deductions during year      
Balance at close of year 723    
MultiFamily Non-Same-Store | Pointe West - St. Cloud, MN      
Real Estate And Accumulated Depreciation [Abstract]      
Encumbrances 5,008    
Initial Cost to Company [Abstract]      
Land 246    
Buildings & Improvements 6,850    
Costs capitalized subsequent to acquisition 765    
Gross amount at which carries at close of period [Abstract]      
Land 260    
Buildings & Improvements 7,601    
Total 7,861    
Accumulated Depreciation $ (422)    
Life on which depreciation in latest income statement is computed 30 years    
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]      
Balance at close of year $ 7,861    
Deductions during year      
Balance at close of year 422    
MultiFamily Non-Same-Store | Portage - Minneapolis, MN      
Real Estate And Accumulated Depreciation [Abstract]      
Encumbrances 5,991    
Initial Cost to Company [Abstract]      
Land 2,133    
Buildings & Improvements 6,685    
Costs capitalized subsequent to acquisition 535    
Gross amount at which carries at close of period [Abstract]      
Land 2,226    
Buildings & Improvements 7,127    
Total 9,353    
Accumulated Depreciation $ (348)    
Life on which depreciation in latest income statement is computed 30 years    
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]      
Balance at close of year $ 9,353    
Deductions during year      
Balance at close of year 348    
MultiFamily Non-Same-Store | River Pointe - Fridley, MN      
Real Estate And Accumulated Depreciation [Abstract]      
Encumbrances 25,412    
Initial Cost to Company [Abstract]      
Land 3,346    
Buildings & Improvements 33,118    
Costs capitalized subsequent to acquisition 2,144    
Gross amount at which carries at close of period [Abstract]      
Land 3,426    
Buildings & Improvements 35,182    
Total 38,608    
Accumulated Depreciation $ (1,764)    
Life on which depreciation in latest income statement is computed 30 years    
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]      
Balance at close of year $ 38,608    
Deductions during year      
Balance at close of year 1,764    
MultiFamily Non-Same-Store | Southdale Parc - Richfield, MN      
Real Estate And Accumulated Depreciation [Abstract]      
Encumbrances 5,301    
Initial Cost to Company [Abstract]      
Land 1,569    
Buildings & Improvements 7,740    
Costs capitalized subsequent to acquisition 466    
Gross amount at which carries at close of period [Abstract]      
Land 1,618    
Buildings & Improvements 8,157    
Total 9,775    
Accumulated Depreciation $ (401)    
Life on which depreciation in latest income statement is computed 30 years    
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]      
Balance at close of year $ 9,775    
Deductions during year      
Balance at close of year 401    
MultiFamily Non-Same-Store | Union Pointe - Longmont, CO      
Real Estate And Accumulated Depreciation [Abstract]      
Encumbrances 0    
Initial Cost to Company [Abstract]      
Land 5,727    
Buildings & Improvements 69,966    
Costs capitalized subsequent to acquisition 624    
Gross amount at which carries at close of period [Abstract]      
Land 5,736    
Buildings & Improvements 70,581    
Total 76,317    
Accumulated Depreciation $ (5,495)    
Life on which depreciation in latest income statement is computed 30 years    
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]      
Balance at close of year $ 76,317    
Deductions during year      
Balance at close of year 5,495    
MultiFamily Non-Same-Store | Venue on Knox - Minneapolis, MN      
Real Estate And Accumulated Depreciation [Abstract]      
Encumbrances 11,660    
Initial Cost to Company [Abstract]      
Land 3,438    
Buildings & Improvements 14,743    
Costs capitalized subsequent to acquisition 2,514    
Gross amount at which carries at close of period [Abstract]      
Land 3,530    
Buildings & Improvements 17,165    
Total 20,695    
Accumulated Depreciation $ (815)    
Life on which depreciation in latest income statement is computed 30 years    
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]      
Balance at close of year $ 20,695    
Deductions during year      
Balance at close of year 815    
MultiFamily Non-Same-Store | Windsor Gates - Brooklyn Park, MN      
Real Estate And Accumulated Depreciation [Abstract]      
Encumbrances 14,731    
Initial Cost to Company [Abstract]      
Land 2,140    
Buildings & Improvements 18,943    
Costs capitalized subsequent to acquisition 1,850    
Gross amount at which carries at close of period [Abstract]      
Land 2,204    
Buildings & Improvements 20,729    
Total 22,933    
Accumulated Depreciation $ (1,065)    
Life on which depreciation in latest income statement is computed 30 years    
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]      
Balance at close of year $ 22,933    
Deductions during year      
Balance at close of year 1,065    
MultiFamily Non-Same-Store | Wingate - New Hope, MN      
Real Estate And Accumulated Depreciation [Abstract]      
Encumbrances 10,459    
Initial Cost to Company [Abstract]      
Land 1,480    
Buildings & Improvements 13,530    
Costs capitalized subsequent to acquisition 1,018    
Gross amount at which carries at close of period [Abstract]      
Land 1,526    
Buildings & Improvements 14,502    
Total 16,028    
Accumulated Depreciation $ (766)    
Life on which depreciation in latest income statement is computed 30 years    
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]      
Balance at close of year $ 16,028    
Deductions during year      
Balance at close of year 766    
MultiFamily Non-Same-Store | Woodhaven - Minneapolis, MN      
Real Estate And Accumulated Depreciation [Abstract]      
Encumbrances 14,408    
Initial Cost to Company [Abstract]      
Land 3,940    
Buildings & Improvements 20,080    
Costs capitalized subsequent to acquisition 1,223    
Gross amount at which carries at close of period [Abstract]      
Land 4,040    
Buildings & Improvements 21,203    
Total 25,243    
Accumulated Depreciation $ (1,036)    
Life on which depreciation in latest income statement is computed 30 years    
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]      
Balance at close of year $ 25,243    
Deductions during year      
Balance at close of year 1,036    
MultiFamily Non-Same-Store | Woodland Pointe - Woodbury, MN      
Real Estate And Accumulated Depreciation [Abstract]      
Encumbrances 31,675    
Initial Cost to Company [Abstract]      
Land 5,367    
Buildings & Improvements 40,422    
Costs capitalized subsequent to acquisition 3,932    
Gross amount at which carries at close of period [Abstract]      
Land 5,449    
Buildings & Improvements 44,272    
Total 49,721    
Accumulated Depreciation $ (2,217)    
Life on which depreciation in latest income statement is computed 30 years    
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]      
Balance at close of year $ 49,721    
Deductions during year      
Balance at close of year 2,217    
MultiFamily Non-Same-Store | Zest - Minneapolis, MN      
Real Estate And Accumulated Depreciation [Abstract]      
Encumbrances 7,910    
Initial Cost to Company [Abstract]      
Land 936    
Buildings & Improvements 10,209    
Costs capitalized subsequent to acquisition 284    
Gross amount at which carries at close of period [Abstract]      
Land 946    
Buildings & Improvements 10,483    
Total 11,429    
Accumulated Depreciation $ (421)    
Life on which depreciation in latest income statement is computed 30 years    
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]      
Balance at close of year $ 11,429    
Deductions during year      
Balance at close of year 421    
Total Multifamily      
Real Estate And Accumulated Depreciation [Abstract]      
Encumbrances 498,277    
Initial Cost to Company [Abstract]      
Land 207,794    
Buildings & Improvements 2,050,346    
Costs capitalized subsequent to acquisition 249,308    
Gross amount at which carries at close of period [Abstract]      
Land 225,217    
Buildings & Improvements 2,282,231    
Total 2,507,448    
Accumulated Depreciation (527,199)    
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]      
Balance at close of year 2,507,448    
Deductions during year      
Balance at close of year 527,199    
Other - Mixed Use      
Real Estate And Accumulated Depreciation [Abstract]      
Encumbrances 0    
Initial Cost to Company [Abstract]      
Land 389    
Buildings & Improvements 19,090    
Costs capitalized subsequent to acquisition 5,212    
Gross amount at which carries at close of period [Abstract]      
Land 607    
Buildings & Improvements 24,084    
Total 24,691    
Accumulated Depreciation (7,904)    
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]      
Balance at close of year 24,691    
Deductions during year      
Balance at close of year 7,904    
Other - Mixed Use | 71 France - Edina, MN      
Real Estate And Accumulated Depreciation [Abstract]      
Encumbrances 0    
Initial Cost to Company [Abstract]      
Land 0    
Buildings & Improvements 5,879    
Costs capitalized subsequent to acquisition 518    
Gross amount at which carries at close of period [Abstract]      
Land 0    
Buildings & Improvements 6,397    
Total 6,397    
Accumulated Depreciation (1,457)    
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]      
Balance at close of year 6,397    
Deductions during year      
Balance at close of year $ 1,457    
Other - Mixed Use | 71 France - Edina, MN | Minimum      
Gross amount at which carries at close of period [Abstract]      
Life on which depreciation in latest income statement is computed 30 years    
Other - Mixed Use | 71 France - Edina, MN | Maximum      
Gross amount at which carries at close of period [Abstract]      
Life on which depreciation in latest income statement is computed 37 years    
Other - Mixed Use | Lugano at Cherry Creek - Denver, CO      
Real Estate And Accumulated Depreciation [Abstract]      
Encumbrances $ 0    
Initial Cost to Company [Abstract]      
Land 0    
Buildings & Improvements 1,600    
Costs capitalized subsequent to acquisition 738    
Gross amount at which carries at close of period [Abstract]      
Land 0    
Buildings & Improvements 2,338    
Total 2,338    
Accumulated Depreciation $ (234)    
Life on which depreciation in latest income statement is computed 30 years    
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]      
Balance at close of year $ 2,338    
Deductions during year      
Balance at close of year 234    
Other - Mixed Use | Civic Lofts - Denver, CO      
Real Estate And Accumulated Depreciation [Abstract]      
Encumbrances 0    
Initial Cost to Company [Abstract]      
Land 0    
Buildings & Improvements 0    
Costs capitalized subsequent to acquisition 0    
Gross amount at which carries at close of period [Abstract]      
Land 0    
Buildings & Improvements 0    
Total 0    
Accumulated Depreciation $ 0    
Life on which depreciation in latest income statement is computed 30 years    
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]      
Balance at close of year $ 0    
Deductions during year      
Balance at close of year 0    
Other - Mixed Use | Zest - Minneapolis, MN      
Real Estate And Accumulated Depreciation [Abstract]      
Encumbrances 0    
Initial Cost to Company [Abstract]      
Land 0    
Buildings & Improvements 52    
Costs capitalized subsequent to acquisition 1    
Gross amount at which carries at close of period [Abstract]      
Land 0    
Buildings & Improvements 53    
Total 53    
Accumulated Depreciation $ (10)    
Life on which depreciation in latest income statement is computed 30 years    
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]      
Balance at close of year $ 53    
Deductions during year      
Balance at close of year 10    
Other - Mixed Use | Noko - Minneapolis, MN      
Real Estate And Accumulated Depreciation [Abstract]      
Encumbrances 0    
Initial Cost to Company [Abstract]      
Land 0    
Buildings & Improvements 118    
Costs capitalized subsequent to acquisition 0    
Gross amount at which carries at close of period [Abstract]      
Land 0    
Buildings & Improvements 118    
Total 118    
Accumulated Depreciation $ (8)    
Life on which depreciation in latest income statement is computed 30 years    
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]      
Balance at close of year $ 118    
Deductions during year      
Balance at close of year 8    
Other - Mixed Use | 191 homes - Oxbo - St Paul, MN      
Real Estate And Accumulated Depreciation [Abstract]      
Encumbrances 0    
Initial Cost to Company [Abstract]      
Land 0    
Buildings & Improvements 3,472    
Costs capitalized subsequent to acquisition 54    
Gross amount at which carries at close of period [Abstract]      
Land 0    
Buildings & Improvements 3,526    
Total 3,526    
Accumulated Depreciation $ (620)    
Life on which depreciation in latest income statement is computed 30 years    
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]      
Balance at close of year $ 3,526    
Deductions during year      
Balance at close of year 620    
Other - Mixed Use | Plaza - Minot, ND      
Real Estate And Accumulated Depreciation [Abstract]      
Encumbrances 0    
Initial Cost to Company [Abstract]      
Land 389    
Buildings & Improvements 5,444    
Costs capitalized subsequent to acquisition 3,467    
Gross amount at which carries at close of period [Abstract]      
Land 607    
Buildings & Improvements 8,693    
Total 9,300    
Accumulated Depreciation (4,683)    
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]      
Balance at close of year 9,300    
Deductions during year      
Balance at close of year $ 4,683    
Other - Mixed Use | Plaza - Minot, ND | Minimum      
Gross amount at which carries at close of period [Abstract]      
Life on which depreciation in latest income statement is computed 30 years    
Other - Mixed Use | Plaza - Minot, ND | Maximum      
Gross amount at which carries at close of period [Abstract]      
Life on which depreciation in latest income statement is computed 37 years    
Other - Mixed Use | Red 20 - Minneapolis, MN      
Real Estate And Accumulated Depreciation [Abstract]      
Encumbrances $ 0    
Initial Cost to Company [Abstract]      
Land 0    
Buildings & Improvements 2,525    
Costs capitalized subsequent to acquisition 434    
Gross amount at which carries at close of period [Abstract]      
Land 0    
Buildings & Improvements 2,959    
Total 2,959    
Accumulated Depreciation (892)    
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]      
Balance at close of year 2,959    
Deductions during year      
Balance at close of year $ 892    
Other - Mixed Use | Red 20 - Minneapolis, MN | Minimum      
Gross amount at which carries at close of period [Abstract]      
Life on which depreciation in latest income statement is computed 30 years    
Other - Mixed Use | Red 20 - Minneapolis, MN | Maximum      
Gross amount at which carries at close of period [Abstract]      
Life on which depreciation in latest income statement is computed 37 years    
Other - Commercial      
Real Estate And Accumulated Depreciation [Abstract]      
Encumbrances $ 0    
Initial Cost to Company [Abstract]      
Land 246    
Buildings & Improvements 1,866    
Costs capitalized subsequent to acquisition (127)    
Gross amount at which carries at close of period [Abstract]      
Land 246    
Buildings & Improvements 1,739    
Total 1,985    
Accumulated Depreciation (298)    
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]      
Balance at close of year 1,985    
Deductions during year      
Balance at close of year 298    
Other - Commercial | 3100 10th St SW - Minot, ND      
Real Estate And Accumulated Depreciation [Abstract]      
Encumbrances 0    
Initial Cost to Company [Abstract]      
Land 246    
Buildings & Improvements 1,866    
Costs capitalized subsequent to acquisition (127)    
Gross amount at which carries at close of period [Abstract]      
Land 246    
Buildings & Improvements 1,739    
Total 1,985    
Accumulated Depreciation $ (298)    
Life on which depreciation in latest income statement is computed 30 years    
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]      
Balance at close of year $ 1,985    
Deductions during year      
Balance at close of year 298    
Total      
Real Estate And Accumulated Depreciation [Abstract]      
Encumbrances 498,277    
Initial Cost to Company [Abstract]      
Land 208,429    
Buildings & Improvements 2,071,302    
Costs capitalized subsequent to acquisition 254,393    
Gross amount at which carries at close of period [Abstract]      
Land 226,070    
Buildings & Improvements 2,308,054    
Total 2,534,124    
Accumulated Depreciation (535,401)    
SEC Schedule, 12-28, Real Estate Companies, Investment in Real Estate [Roll Forward]      
Balance at close of year 2,534,124    
Deductions during year      
Balance at close of year $ 535,401