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Commitments and Contingencies (Tables) | 6 Months Ended
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Jun. 30, 2017
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:
| June 30, 2017 |  | December 31, 2016
| (in thousands)
Commitments to extend credit | $ | 6,382,314 |  |  | $ | 6,075,567 |
Standby letters of credit | 349,953 |  |  | 356,359 |
Commercial letters of credit | 41,501 |  |  | 38,901 |

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