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Other Assets Accrued Interest Receivable and Other Assets (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract] |  |
Accrued interest receivable | $ 5,678 | $ 5,019
Net deferred tax asset | 2,173 | 2,584
Investment in historic development entities | 1,849 | 1,161
Investment in a community development entity | 6,209 | 6,591
Investment in limited partnerships | 3,888 | 4,261
Investment in Trust II | 315 | 315
Fair value of interest rate swaps | 2,470 | 942
Prepaid expenses | 3,266 | 3,091
Other assets | 5,445 | 5,884
Total accrued interest receivable and other assets | $ 31,293 | $ 29,848

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