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Commitments (Tables) | 12 Months Ended
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Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract] |
Schedule of Commitments | The contractual amounts of off-balance-sheet financial instruments as of December 31, 2017, and December 31, 2016, are as follows:
(in thousands) | December 31, 2017 |  | December 31, 2016
Commitments to extend credit | $ | 1,298,423 |  |  | $ | 1,075,170 |
Letters of credit | 73,790 |  |  | 78,954 |

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