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Commitments and Contingencies (Tables) | 9 Months Ended
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Sep. 30, 2016
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 as of the dates indicated were as follows:
| September 30, 2016 |  | December 31, 2015
| (in thousands)
Commitments to extend credit | $ | 6,073,712 |  |  | $ | 5,784,138 |
Standby letters of credit | 365,562 |  |  | 374,729 |
Commercial letters of credit | 35,532 |  |  | 39,529 |

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