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Other Assets Other Assets (Tax Credits) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Other Assets [Abstract]    
Investment in historic development entities $ 2,216,000 $ 1,653,000
Capital Contributions to Historic Rehabilitation Tax Credits 9,400,000 2,000,000
Tax Credit Benefits Recognized on Federal Historic Tax Credits 5,200,000 2,535,000
Expense Related to Investment in Historic Rehabilitation Tax Credits 3,600,000 1,633,000
Gain on sale of investments 413,000  
Proceeds from sale of other investments   0
Investment in a community development entity $ 5,571,000 6,081,000
New Market Tax Credit Benefit, Period of Recognition 7 years  
Federal New Market Tax Credits Not Yet Recognized $ 450,000  
Tax Credit Benefits Recognized on New Market Tax Credits $ 450,000 $ 450,000