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Other Assets Other Assets (Tax Credits) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Other Assets [Abstract]    
Investment in historic development entities $ 2,356,000 $ 2,216,000
Capital Contributions to Historic Rehabilitation Tax Credits 4,400,000 9,400,000
Tax Credit Benefits Recognized on Federal Historic Tax Credits 2,800,000 5,200,000
Expense Related to Investment in Historic Rehabilitation Tax Credits 1,900,000 3,600,000
Tax Credit Benefits Recognized on State Historic Tax Credits 2,700,000 4,700,000
Gain on sale of investments 275,000 413,000
Investment in a community development entity $ 5,306,000 5,571,000
New Market Tax Credit Benefit, Period of Recognition 7 years  
Tax Credit Benefits Recognized on New Market Tax Credits $ 450,000 $ 450,000