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Commitments and Contingencies (Tables) | 6 Months Ended
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Jun. 30, 2019
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, 2019 |  | December 31, 2018
| (in thousands)
Commitments to extend credit | $ | 6,688,574 |  |  | $ | 6,306,583 |
Standby letters of credit | 300,262 |  |  | 309,352 |
Commercial letters of credit | 47,368 |  |  | 48,682 |

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