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Goodwill and Intangible Assets (Details) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 USD ($) $ / loans Rate | Dec. 31, 2017 USD ($) $ / loans Rate | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Servicing Asset at Amortized Cost [Line Items] |  |  |  |
Servicing Asset at Amortized Cost | $ 21,396,000 | $ 21,945,000 | $ 20,415,000 | $ 19,351,000
Servicing Asset at Amortized Cost, Additions | 5,258,000 | 7,174,000 | 5,931,000 |
Amortization | (5,807,000) | (5,648,000) | (4,958,000) |
Valuation Allowance for Impairment of Recognized Servicing Assets, Provisions (Recoveries) | 0 | (4,000) | (91,000) |
Residential Mortgage Loans Serviced | $ 2,950,000,000 | $ 2,810,000,000 | 2,490,000,000 |
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Prepayment Speed | Rate | 9.26% | 10.93% |  |
Contractually Specified Servicing Fee, Late Fee, and Ancillary Fee Earned in Exchange for Servicing Financial Asset | $ 7,500,000 | $ 7,100,000 | 5,800,000 |
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Cost to Service Loans | $ / loans | 72.65 | 64.03 |  |
Goodwill [Roll Forward] |  |  |  |
Beginning goodwill | $ 150,601,000 | $ 150,601,000 |  |
Ending goodwill | 236,347,000 | 150,601,000 | 150,601,000 |
Finite-lived Intangible Assets [Roll Forward] |  |  |  |
Beginning balance | 51,151,000 | 57,625,000 |  |
Amortization | (17,165,000) | (17,194,000) |  |
Ending balance | 48,232,000 | 51,151,000 | $ 57,625,000 |
Finite-Lived Intangible Assets [Abstract] |  |  |  |
Gross balance | 143,007,000 | 128,761,000 |  |
Accumulated amortization | (94,775,000) | (77,610,000) |  |
Carrying value | 48,232,000 | 51,151,000 |  |
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] |  |  |  |
2019 | 14,964,000 |  |  |
2020 | 11,729,000 |  |  |
2021 | 8,706,000 |  |  |
2022 | 5,805,000 |  |  |
2023 and subsequent | 7,028,000 |  |  |
Other servicing rights | 2,700,000 | 0 |  |
HomeBancorp Inc. |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Goodwill acquired | 57,616,000 | 0 |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |  |
Intangible assets acquired | 9,860,000 | 0 |  |
Capital Commerce Bancorp |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Goodwill acquired | 10,680,000 | 0 |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |  |
Intangible assets acquired | 2,680,000 | 0 |  |
Palmetto Heritage Bancshares |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Goodwill acquired | 17,450,000 | 0 |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |  |
Intangible assets acquired | 1,706,000 | 0 |  |
Harvest Community Bank |  |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |  |
Intangible assets acquired | 0 | 850,000 |  |
Guaranty Bank |  |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |  |
Intangible assets acquired | $ 0 | $ 9,870,000 |  |
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 | 9.6851% | 9.41% |  |
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 | 10.6851% | 10.41% |  |
Core deposits | Minimum |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Useful life | 1 year |  |  |
Core deposits | Maximum |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Useful life | 10 years |  |  |

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