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Commitments and Contingencies (Tables) | 3 Months Ended
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Mar. 31, 2018
Commitments and Contingencies Disclosure [Abstract] |
Summary of Outstanding Commitments to Extend Credit and Letters of Credit | The outstanding amounts of commitments to extend credit and letters of credit were as follows:
| March 31, 2018 |  | December 31, 2017
| (in thousands)
Commitments to extend credit | $ | 6,418,380 |  |  | $ | 6,205,029 |
Standby letters of credit | 318,827 |  |  | 326,973 |
Commercial letters of credit | 43,709 |  |  | 41,801 |

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