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Commitments, Off-Balance Sheet Arrangements, Legal Proceedings and Regulatory Matters Residential Mortgage Repurchase Reserve (Details) - USD ($) $ in Thousands | 6 Months Ended
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Jun. 30, 2018 | Jun. 30, 2017
Residential mortgage repurchase reserve |  |
Balance at beginning of period | $ 24,000 |
Balance at end of period | 26,000 |
Mortgage Repurchase Reserve |  |
Residential mortgage repurchase reserve |  |
Balance at beginning of period | 987 | $ 900
Repurchase provision expense | 150 | 246
Charge offs, net | (90) | (159)
SEC Schedule, 12-09, Valuation Allowances and Reserves, Business Acquired | 88 | $ 0
Balance at end of period | $ 1,135 |

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