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Financial Instruments with Off-Balance-Sheet Risk (Tables) | 12 Months Ended
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Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract] |
Schedule of Financial Instruments Outstanding Contract Amounts Represent Credit Risk | The following financial instruments were outstanding whose contract amounts represent credit risk:
| December 31,
| 2017 |  | 2016
(amounts in thousands) |
Commitments to fund loans | $ | 333,874 |  |  | $ | 244,784 |
Unfunded commitments to fund mortgage warehouse loans | 1,567,139 |  |  | 1,230,596 |
Unfunded commitments under lines of credit | 485,345 |  |  | 480,446 |
Letters of credit | 39,890 |  |  | 40,223 |
Other unused commitments | 6,679 |  |  | 5,310 |

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