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Goodwill and Intangible Assets (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 USD ($) $ / loans Rate | Dec. 31, 2015 USD ($) $ / loans Rate | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($)
Servicing Asset at Amortized Cost [Line Items] |  |  |  |
Servicing Asset at Amortized Cost | $ 20,415,000 | $ 19,351,000 | $ 16,688,000 | $ 16,000
Servicing Asset at Amortized Cost, Additions | 5,931,000 | 5,910,000 | 727,000 |
Valuation Allowance for Impairment of Recognized Servicing Assets, Balance | 4,000 | 95,000 | 850,000 | $ 0
Residential Mortgage Loans Serviced | $ 2,490,000,000 | $ 2,150,000,000 | 1,950,000,000 |
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Prepayment Speed | Rate | 10.42% | 11.01% |  |
Contractually Specified Servicing Fees, Late Fees, and Ancillary Fees Earned in Exchange for Servicing Financial Assets | $ 5,800,000 | $ 5,400,000 | 600,000 |
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Cost to Service Loans | $ / loans | 62.75 | 56.61 |  |
Amortization | $ (4,958,000) | $ (4,002,000) | (919,000) |
Goodwill [Roll Forward] |  |  |  |
Beginning goodwill | 139,773,000 | 139,773,000 |  |
Ending goodwill | 150,601,000 | 139,773,000 | 139,773,000 |
Finite-lived Intangible Assets [Roll Forward] |  |  |  |
Beginning balance | 90,986,000 |  |  |
Finite Lived Intangible Assets Removed Due To Branch Sale | 0 | (85,000) |  |
Amortization | (16,850,000) | (18,892,000) |  |
Ending balance | 78,040,000 | 90,986,000 |  |
Finite-Lived Intangible Assets [Abstract] |  |  |  |
Gross balance | 118,041,000 | 115,201,000 |  |
Accumulated amortization | (60,416,000) | (43,566,000) |  |
Carrying value | 57,625,000 | 71,635,000 |  |
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] |  |  |  |
2015 | 14,556,000 |  |  |
2016 | 12,220,000 |  |  |
2017 | 9,892,000 |  |  |
2018 | 7,838,000 |  |  |
2019 | 5,996,000 |  |  |
Other Intangible Assets, Net | 57,625,000 | 71,635,000 | 89,922,000 |
Valuation Allowance for Impairment of Recognized Servicing Assets, Provisions (Recoveries) | (91,000) | (755,000) | 850,000 |
1st Financial |  |  |  |
Servicing Asset at Amortized Cost [Line Items] |  |  |  |
Servicing Asset at Fair Value, Additions | $ 0 | 0 | 148,000 |
Goodwill [Roll Forward] |  |  |  |
Useful life | 3 months |  |  |
Cordia Bancorp Inc. |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Goodwill acquired | $ 10,828,000 | 0 |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |  |
Intangible assets acquired | 2,210,000 | 0 |  |
Capitol City Bank and Trust |  |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |  |
Intangible assets acquired | 0 | 690,000 |  |
North Milwaukee State Bank |  |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |  |
Intangible assets acquired | 240,000 | 0 |  |
First CornerStone Bank |  |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |  |
Intangible assets acquired | 390,000 | 0 |  |
Bancorporation |  |  |  |
Servicing Asset at Amortized Cost [Line Items] |  |  |  |
Servicing Asset at Fair Value, Additions | $ 0 | $ 0 | $ 17,566,000 |
Goodwill [Roll Forward] |  |  |  |
Useful life | 5 years 6 months |  |  |
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 | 9.45% | 9.31% |  |
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 | 10.45% | 10.31% |  |
Core deposits | Minimum |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Useful life | 2 years |  |  |
Core deposits | Maximum |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Useful life | 9 years |  |  |

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