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Commitments and Contingencies (Tables) | 9 Months Ended
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Sep. 30, 2018
Commitments and Contingencies [Abstract] |
Off-Balance Sheet Financial Instruments |
﻿ |  |  |  |  |  |
﻿ |  |  | September 30, |  |  | December 31,
﻿(in thousands) |  |  | 2018 |  |  | 2017
﻿Commitments to extend credit |  | $ | 7,212,886 |  | $ | 6,689,033
﻿Letters of credit |  |  | 353,490 |  |  | 348,377
﻿

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