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Other Assets Other Assets (Tax Credits) (Details) - USD ($) | 12 Months Ended
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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

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