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Other Assets Tax Credits Narrative (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | Dec. 31, 2015
Investment Holdings [Line Items] |  |  |  |  |
Investment in Limited Partnerships | $ 3,881,000 |  | $ 3,881,000 |  | $ 3,215,000
Impairment of tax credit investments | 3,314,000 | $ 0 | 3,520,000 | $ 0 |
BOC Investment, LLC | Historic Rehabilitation Tax Credits |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Investment in Limited Partnerships | 169,000 |  | 169,000 |  | 578,000
Tax Credit Benefits Recognized | 3,600,000 |  |  |  |
Impairment of tax credit investments | 3,200,000 |  |  |  |
Mitchell Street Apartments Investment, LLC | Historic Rehabilitation Tax Credits |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Investment in Limited Partnerships | 130,000 |  | 130,000 |  |
Estimated Capital Contributions | 5,500,000 |  | 5,500,000 |  |
Tax Credit Benefits Recognized |  |  | $ 0 |  |
Tax Credit Benefit Recognized, Period for Recapture |  |  | 5 years |  |
Rimrock Road Investment Fund, LLC | New Market Tax Credits |  |  |  |  |
Investment Holdings [Line Items] |  |  |  |  |
Investment in Limited Partnerships | 7,200,000 |  | $ 7,200,000 |  | $ 7,500,000
New Market Tax Credit Benefit, Period of Recognition |  |  | 7 years |  |
Federal New Market Tax Credits Not Yet Recognized | $ 1,900,000 |  | $ 1,900,000 |  |
Tax Credit Benefits Recognized |  |  | $ 281,000 | $ 281,000 |

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