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Other Assets Tax Credits Narrative (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Dec. 31, 2016
Investment Holdings [Line Items] |  |  |
Investment in limited partnerships | $ 3,983,000 |  | $ 3,963,000
Impairment of tax credit investments | 113,000 | $ 112,000 |
BOC Investment, LLC | Historic Rehabilitation Tax Credits |  |  |
Investment Holdings [Line Items] |  |  |
Investment in limited partnerships | 174,000 |  | 174,000
Tax Credit Benefits Recognized |  |  | 3,800,000
Impairment of tax credit investments |  |  | 3,300,000
Mitchell Street Apartments Investment, LLC | Historic Rehabilitation Tax Credits |  |  |
Investment Holdings [Line Items] |  |  |
Investment in limited partnerships | 563,000 |  | 563,000
Tax Credit Benefits Recognized | 0 |  |
Estimated Capital Contributions | 5,500,000 |  |
Rimrock Road Investment Fund, LLC | New Market Tax Credits |  |  |
Investment Holdings [Line Items] |  |  |
Investment in limited partnerships | 7,000,000 |  | $ 7,100,000
Tax Credit Benefits Recognized | $ 113,000 |  |
New Market Tax Credit Benefit, Period of Recognition | 7 years |  |
Federal New Market Tax Credits Not Yet Recognized | $ 1,700,000 |  |
Federal New Market Tax Credit [Member] | Rimrock Road Investment Fund, LLC | New Market Tax Credits |  |  |
Investment Holdings [Line Items] |  |  |
Tax Credit Benefits Recognized |  | $ 113,000 |

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