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Pay vs Performance Disclosure
 12 Months Ended
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Pay vs Performance Disclosure          
Pay vs Performance Disclosure, Table
Value of Initial Fixed
$100 Investment Based On:
Year
Summary
Compensation
Table Total
for CEO(1)
Compensation
Actually Paid
to CEO(1)(5)
Average
Summary
Compensation
Table Total
for Non-CEO
NEOs
Average
Compensation
Actually Paid
to Non-CEO
NEOs(5)
Total
Stockholder
 Return
Peer Group
Total
Stockholder
Return(6)
Net Income (in thousands)Return On Average Equity
2024$1,246,543$1,309,926
$736,626(2)
$804,714(2)
105.98122.10$24,05010.71 %
20231,303,3881,128,618
790,259(2)
662,863(2)
98.38100.0824,13711.42 
20221,262,6481,060,570
905,793(2)
764,704(2)
112.2898.0346,39920.71 
20211,024,7971,623,245
765,149(3)
1,269,978(3)
131.21113.5949,60720.33 
2020967,524725,866
731,858(4)
490,200(4)
78.8285.9832,71214.49 
        
Company Selected Measure Name Return On Average Equity        
Named Executive Officers, Footnote
(1) The CEO in 2024, 2023, 2022, 2021 and 2020 was Mr. Nelson.
(2) Non-CEO NEOs in 2024, 2023 and 2022 were Messrs. Olafson, Winterbottom and Peters and Ms. Funk.
(3) Non-CEO NEOs in 2021 were Messrs. Gulling, Olafson, Winterbottom and Peters.
(4) Non-CEO NEOs in 2020 were Messrs. Gulling, Olafson and Winterbottom.
        
Peer Group Issuers, Footnote The peer group consists of the S&P U.S. BMI Banks - Midwest Region Index.        
PEO Total Compensation Amount $ 1,246,543 $ 1,303,388 $ 1,262,648 $ 1,024,797 $ 967,524
PEO Actually Paid Compensation Amount $ 1,309,926 1,128,618 1,060,570 1,623,245 725,866
Adjustment To PEO Compensation, Footnote See the table immediately following these footnotes for a reconciliation of the Summary Compensation Table compensation and the Compensation Actually Paid to the CEO        
Non-PEO NEO Average Total Compensation Amount $ 736,626 790,259 905,793 765,149 731,858
Non-PEO NEO Average Compensation Actually Paid Amount $ 804,714 662,863 764,704 1,269,978 490,200
Adjustment to Non-PEO NEO Compensation Footnote and Non-CEO NEOs        
Total Shareholder Return Amount $ 105.98 98.38 112.28 131.21 78.82
Peer Group Total Shareholder Return Amount 122.10 100.08 98.03 113.59 85.98
Net Income (Loss) $ 24,050 $ 24,137 $ 46,399 $ 49,607 $ 32,712
Company Selected Measure Amount 0.1071 0.1142 0.2071 0.2033 0.1449
PEO Name Mr. Nelson. Mr. Nelson. Mr. Nelson.    
PEO | Grant date fair value of stock awards granted in fiscal year [Member]          
Pay vs Performance Disclosure          
Adjustment to Compensation, Amount $ (234,473) $ (288,788) $ (395,589) $ (257,325) $ (188,198)
PEO | Fair value at fiscal year-end of outstanding and unvested stock awards granted in prior fiscal years [Member]          
Pay vs Performance Disclosure          
Adjustment to Compensation, Amount 307,998 297,160 319,725 407,213 261,150
PEO | Change in fair value of outstanding and unvested stock awards granted in fiscal year [Member]          
Pay vs Performance Disclosure          
Adjustment to Compensation, Amount 34,907 (119,715) (151,725) 361,410 (178,260)
PEO | Change in fair value as of vesting date of stock awards granted in prior fiscal years for which applicable vesting conditions were satisfied during fiscal year [Member]          
Pay vs Performance Disclosure          
Adjustment to Compensation, Amount (45,049) (63,427) 25,511 87,150 (136,350)
Non-PEO NEO | Grant date fair value of stock awards granted in fiscal year [Member]          
Pay vs Performance Disclosure          
Adjustment to Compensation, Amount (206,888) (254,813) (348,532) (235,881) (188,198)
Non-PEO NEO | Fair value at fiscal year-end of outstanding and unvested stock awards granted in prior fiscal years [Member]          
Pay vs Performance Disclosure          
Adjustment to Compensation, Amount 271,763 262,200 287,753 377,761 261,150
Non-PEO NEO | Change in fair value of outstanding and unvested stock awards granted in fiscal year [Member]          
Pay vs Performance Disclosure          
Adjustment to Compensation, Amount 30,976 (92,717) (104,453) 294,169 (178,260)
Non-PEO NEO | Change in fair value as of vesting date of stock awards granted in prior fiscal years for which applicable vesting conditions were satisfied during fiscal year [Member]          
Pay vs Performance Disclosure          
Adjustment to Compensation, Amount $ (27,763) $ (42,066) $ 24,143 $ 68,780 $ (136,350)