XML 71 R61.htm IDEA: XBRL DOCUMENT v3.7.0.1
Other Assets Tax Credits Narrative (Details) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Investment Holdings [Line Items]      
Investment in limited partnerships $ 3,983,000   $ 3,963,000
Impairment of tax credit investments 113,000 $ 112,000  
BOC Investment, LLC | Historic Rehabilitation Tax Credits      
Investment Holdings [Line Items]      
Investment in limited partnerships 174,000   174,000
Tax Credit Benefits Recognized     3,800,000
Impairment of tax credit investments     3,300,000
Mitchell Street Apartments Investment, LLC | Historic Rehabilitation Tax Credits      
Investment Holdings [Line Items]      
Investment in limited partnerships 563,000   563,000
Tax Credit Benefits Recognized 0    
Estimated Capital Contributions 5,500,000    
Rimrock Road Investment Fund, LLC | New Market Tax Credits      
Investment Holdings [Line Items]      
Investment in limited partnerships 7,000,000   $ 7,100,000
Tax Credit Benefits Recognized $ 113,000    
New Market Tax Credit Benefit, Period of Recognition 7 years    
Federal New Market Tax Credits Not Yet Recognized $ 1,700,000    
Federal New Market Tax Credit [Member] | Rimrock Road Investment Fund, LLC | New Market Tax Credits      
Investment Holdings [Line Items]      
Tax Credit Benefits Recognized   $ 113,000