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Commitments (Tables) | 6 Months Ended
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Jun. 30, 2018
Commitments and Contingencies Disclosure [Abstract] |
Schedule of Commitments | The contractual amounts of off-balance-sheet financial instruments as of June 30, 2018, and December 31, 2017, are as follows:
(in thousands) | June 30, 2018 |  | December 31, 2017
Commitments to extend credit | $ | 1,272,570 |  |  | $ | 1,298,423 |
Letters of credit | 54,647 |  |  | 73,790 |

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