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Other Assets Accrued Interest Receivable and Other Assets (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
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Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract] |  |
Accrued interest receivable | $ 4,722 | $ 4,677
Net deferred tax asset | 5,543 | 4,052
Investment in historic development entities | 1,154 | 737
Investment in a CDE | 6,719 | 7,106
Investment in limited partnerships | 4,607 | 3,963
Investment in Trust II | 315 | 315
Fair value of interest rate swaps | 1,380 | 352
Prepaid expenses | 3,338 | 3,074
Other assets | 4,450 | 4,331
Total accrued interest receivable and other assets | $ 32,228 | $ 28,607

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