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Other Assets Other Assets Tax Credit Narrative (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Tax Credit Carryforward [Line Items] |  |  |  |
Investment in limited partnerships | $ 3,963,000 | $ 3,963,000 | $ 3,215,000 |
Investment Tax Credit Impairment Cost |  | 3,691,000 | 0 | $ 0
Investment in Community Development Entities | 7,106,000 | 7,106,000 | 7,500,000 |
Mitchell Street Apartments | Historic Rehabilitation Tax Credits |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |
Investment in limited partnerships | 563,000 | 563,000 |  |
Estimated Capital Contributions | 5,500,000 | $ 5,500,000 |  |
Tax Credit Benefit Recognized, Period for Recapture |  | 5 years |  |
Tax Credit Benefits Recognized |  | $ 0 |  |
Rimrock Road | New Market Tax Credits |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |
New Market Tax Credit Benefit, Period of Recognition |  | 7 years |  |
Federal New Market Tax Credits Not Yet Recognized | 1,800,000 | $ 1,800,000 |  |
Tax Credit Benefits Recognized |  | 375,000 |  |
Rimrock Road | New Market Tax Credits | Federal New Market Tax Credit |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |
Tax Credit Benefits Recognized |  |  | 375,000 |
BOC Investment | Historic Rehabilitation Tax Credits |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |
Investment in limited partnerships | 174,000 | 174,000 | $ 578,000 |
Capital Contributions |  | $ 2,800,000 |  |
Investment Tax Credit Impairment Cost | 3,300,000 |  |  |
Tax Credit Benefits Recognized | $ 3,800,000 |  |  |

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