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Commitments and Contingencies (Tables) | 12 Months Ended
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Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract] |
Summary of Outstanding Commitments to Extend Credit and Letters of Credit | The following table presents commitments to extend credit and letters of credit:
| 2017 |  | 2016
| (in thousands)
Commercial and other | $ | 3,689,700 |  |  | $ | 3,673,815 |
Home equity | 1,422,284 |  |  | 1,368,465 |
Commercial mortgage and construction | 1,093,045 |  |  | 1,033,287 |
Total commitments to extend credit | $ | 6,205,029 |  |  | $ | 6,075,567 |
Standby letters of credit | $ | 326,973 |  |  | $ | 356,359 |
Commercial letters of credit | 41,801 |  |  | 38,901 |
Total letters of credit | $ | 368,774 |  |  | $ | 395,260 |

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