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Commitments and Contingencies (Tables) | 9 Months Ended
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Sep. 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:
| September 30, 2019 |  | December 31, 2018
| (in thousands)
Commitments to extend credit | $ | 6,872,248 |  |  | $ | 6,306,583 |
Standby letters of credit | 308,533 |  |  | 309,352 |
Commercial letters of credit | 48,047 |  |  | 48,682 |

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