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Time Deposit Maturities (Tables) | 12 Months Ended
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Dec. 31, 2017
Maturities of Time Deposits [Abstract] |
Schedule of Time Deposits Included in Interest-Bearing Deposits |
(Dollars in thousands) |  |
2018 |  | $ | 2,001,083 |
2019 |  | 612,010 |
2020 |  | 155,788 |
2021 |  | 131,580 |
2022 |  | 406,963 |
2023 and after |  | 15,497 |
Total |  | $ | 3,322,921 |

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