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Goodwill and Other Intangible Assets (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Goodwill [Roll Forward] |  |  |
Beginning balance | $ 265,439 | $ 265,957 |
Goodwill acquired | 2,604 | 2,047 |
Goodwill adjustments |  | (2,565) |
Ending balance | 268,043 | 265,439 | $ 265,957
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross carrying amount | 42,607 | 41,313 |
Less: accumulated amortization | 29,187 | 25,498 |
Net carrying amount | 13,420 | 15,815 |
Impairment of intangible assets | 1,500 | 0 |
Impairment of goodwill | 0 | 2,565 |
Amortization Expense [Abstract] |  |  |
Amortization of intangible assets | 3,960 | 3,928 | $ 4,864
Future Amortization Expense [Abstract] |  |  |
2018 | 3,300 |  |
2019 | 2,700 |  |
2020 | 2,200 |  |
2021 | 1,600 |  |
2022 | 1,100 |  |
Thereafter | $ 2,500 |  |
Minimum [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Intangible asset useful life | 1 year |  |
Maximum [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Intangible asset useful life | 20 years |  |
Core Deposits Intangibles [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross carrying amount | $ 8,975 | 8,975 |
Less: accumulated amortization | 6,581 | 5,626 |
Net carrying amount | 2,394 | 3,349 |
Identified Intangible Assets [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross carrying amount | 33,632 | 32,338 |
Less: accumulated amortization | 22,606 | 19,872 |
Net carrying amount | $ 11,026 | $ 12,466 |

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