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Goodwill and Intangible Assets (Details) |  |  | 12 Months Ended
--- | --- | --- | ---
Oct. 02, 2014 USD ($) | Jan. 02, 2014 USD ($) | Dec. 31, 2015 USD ($) $ / loans Rate | Dec. 31, 2014 USD ($) $ / loans Rate | Dec. 31, 2013 USD ($)
Servicing Asset at Amortized Cost [Line Items] |  |  |  |  |
Servicing Asset at Amortized Cost |  |  | $ 19,351,000 | $ 16,688,000 | $ 16,000
Servicing Asset at Amortized Cost, Additions |  |  | 5,910,000 | 727,000 |
Valuation Allowance for Impairment of Recognized Servicing Assets, Balance |  |  | 95,000 | 850,000 | 0
Residential Mortgage Loans Serviced |  |  | $ 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 |  |  | 11.01% | 14.25% |
Contractually Specified Servicing Fees, Late Fees, and Ancillary Fees Earned in Exchange for Servicing Financial Assets |  |  | $ 5,400,000 | $ 600,000 | 300,000
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Cost to Service Loans | $ / loans |  |  | 56,610.00 | 56,020.00 |
Amortization |  |  | $ (4,002,000) | $ (919,000) | (205,000)
Goodwill [Roll Forward] |  |  |  |  |
Beginning goodwill |  | $ 102,625,000 | 139,773,000 | 102,625,000 |
Ending goodwill |  |  | 139,773,000 | 139,773,000 | 102,625,000
Finite-lived Intangible Assets [Roll Forward] |  |  |  |  |
Beginning balance |  |  | 106,610,000 |  |
Finite Lived Intangible Assets Removed Due To Branch Sale |  |  | (85,000) | 0 |
Amortization |  |  | (18,892,000) | (6,955,000) |
Ending balance |  |  | 90,986,000 | 106,610,000 |
Finite-Lived Intangible Assets [Abstract] |  |  |  |  |
Gross balance |  |  | 115,201,000 | 114,596,000 |
Accumulated amortization |  |  | (43,566,000) | (24,674,000) |
Carrying value |  |  | 71,635,000 | 89,922,000 |
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] |  |  |  |  |
2015 |  |  | 16,440,000 |  |
2016 |  |  | 14,075,000 |  |
2017 |  |  | 11,710,000 |  |
2018 |  |  | 9,457,000 |  |
2019 |  |  | 7,492,000 |  |
Other Intangible Assets, Net |  |  | 71,635,000 | 89,922,000 | $ 1,247,000
Valuation Allowance for Impairment of Recognized Servicing Assets, Provisions (Recoveries) |  |  | 755,000 | (850,000) |
Capitol City Bank and Trust |  |  |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |  |  |
Intangible assets acquired |  |  | 690,000 | 0 |
1st Financial |  |  |  |  |
Servicing Asset at Amortized Cost [Line Items] |  |  |  |  |
Finite-Lived Core Deposits, Gross |  |  | 3,800,000 |  |
Servicing Asset at Fair Value, Additions |  |  | 0 | 148,000 |
Goodwill [Roll Forward] |  |  |  |  |
Goodwill acquired |  | $ 32,915,000 | $ 0 | 32,915,000 |
Useful life |  |  | 3 months |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |  |  |
Intangible assets acquired |  |  | $ 0 | 3,780,000 |
Bancorporation |  |  |  |  |
Servicing Asset at Amortized Cost [Line Items] |  |  |  |  |
Finite-Lived Core Deposits, Gross |  |  | 91,900,000 |  |
Servicing Asset at Fair Value, Additions |  |  | 0 | 17,566,000 |
Goodwill [Roll Forward] |  |  |  |  |
Goodwill acquired | $ 4,233,000 |  | $ 0 | 4,233,000 |
Useful life |  |  | 5 years 6 months |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |  |  |
Intangible assets acquired |  |  | $ 0 | $ 91,850,000 |
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 |  |  | 9.31% | 7.20% |
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 |  |  | 10.31% | 9.20% |
Core deposits | Minimum |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
Useful life |  |  | 2 years |  |
Core deposits | Maximum |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
Useful life |  |  | 9 years |  |

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