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Commitments and Contingencies (Tables) | 9 Months Ended
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Sep. 30, 2020
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, 2020 |  | December 31, 2019
| (in thousands)
Commitments to extend credit | $ | 8,325,169 |  |  | $ | 6,689,519 |
Standby letters of credit | 294,429 |  |  | 303,020 |
Commercial letters of credit | 54,112 |  |  | 50,432 |

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