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Commitments and Contingencies (Tables) | 3 Months Ended
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Mar. 31, 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:
| March 31, 2016 |  | December 31, 2015
| (in thousands)
Commitments to extend credit | $ | 5,932,144 |  |  | $ | 5,784,138 |
Standby letters of credit | 369,932 |  |  | 374,729 |
Commercial letters of credit | 37,596 |  |  | 39,529 |

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