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Goodwill and Intangible Assets (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 USD ($) $ / loans Rate | Dec. 31, 2016 USD ($) $ / loans Rate | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Servicing Asset at Amortized Cost [Line Items] |  |  |  |
Servicing Asset at Amortized Cost | $ 21,945,000 | $ 20,415,000 | $ 19,351,000 | $ 16,688,000
Servicing Asset at Amortized Cost, Additions | 7,174,000 | 5,931,000 | 5,910,000 |
Amortization | (5,648,000) | (4,958,000) | (4,002,000) |
Valuation Allowance for Impairment of Recognized Servicing Assets, Provisions (Recoveries) | (4,000) | (91,000) | (755,000) |
Valuation Allowance for Impairment of Recognized Servicing Assets, Balance | 0 | 4,000 | 95,000 | $ 850,000
Residential Mortgage Loans Serviced | $ 2,810,000,000 | $ 2,490,000,000 | 2,150,000,000 |
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Prepayment Speed | Rate | 10.93% | 10.42% |  |
Contractually Specified Servicing Fee, Late Fee, and Ancillary Fee Earned in Exchange for Servicing Financial Asset | $ 7,100,000 | $ 5,800,000 | 5,400,000 |
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Cost to Service Loans | $ / loans | 64.03 | 62.75 |  |
Goodwill [Roll Forward] |  |  |  |
Beginning goodwill | $ 150,601,000 | $ 139,773,000 |  |
Ending goodwill | 150,601,000 | 150,601,000 | 139,773,000 |
Finite-lived Intangible Assets [Roll Forward] |  |  |  |
Beginning balance | 57,625,000 | 71,635,000 |  |
Amortization | (17,194,000) | (16,850,000) |  |
Ending balance | 51,151,000 | 57,625,000 | $ 71,635,000 |
Finite-Lived Intangible Assets [Abstract] |  |  |  |
Gross balance | 128,761,000 | 118,041,000 |  |
Accumulated amortization | (77,610,000) | (60,416,000) |  |
Carrying value | 51,151,000 | 57,625,000 |  |
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] |  |  |  |
2018 | 15,394,000 |  |  |
2019 | 12,275,000 |  |  |
2020 | 9,431,000 |  |  |
2021 | 6,799,000 |  |  |
2022 | 4,288,000 |  |  |
North Milwaukee State Bank |  |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |  |
Intangible assets acquired | 0 | 240,000 |  |
First CornerStone Bank |  |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |  |
Intangible assets acquired | 0 | 390,000 |  |
Cordia Bancorp Inc. |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Goodwill acquired | 0 | 10,828,000 |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |  |
Intangible assets acquired | 0 | 2,210,000 |  |
Harvest Community Bank |  |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |  |
Intangible assets acquired | 850,000 | 0 |  |
Guaranty Bank |  |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |  |
Intangible assets acquired | $ 9,870,000 | $ 0 |  |
Conventional fixed loans |  |  |  |
Servicing Asset at Amortized Cost [Line Items] |  |  |  |
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Discount Rate | Rate | 9.41% | 9.45% |  |
All loans and leases excluding conventional fixed loans [Member] |  |  |  |
Servicing Asset at Amortized Cost [Line Items] |  |  |  |
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Discount Rate | Rate | 10.41% | 10.45% |  |
Core deposits | Minimum |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Useful life | 1 year |  |  |
Core deposits | Maximum |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Useful life | 8 years |  |  |

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