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Other Income And Other Expense (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
All other income and commissions: |  |  |
Other service charges | $ 12,532,000 | $ 11,731,000 | $ 11,610,000
ATM interchange fees | 12,425,000 | 11,965,000 | 11,917,000
Deferred compensation | 6,322,000 | 3,025,000 | (1,369,000)
Electronic banking fees | 5,082,000 | 5,477,000 | 5,840,000
Letter of credit fees | 4,661,000 | 4,103,000 | 4,621,000
Mortgage banking | 4,649,000 | 10,215,000 | 3,870,000
Insurance commissions | 2,514,000 | 2,981,000 | 2,627,000
Gain/(loss) on extinguishment of debt | (14,329,000) | 0 | 5,793,000
Other | 11,029,000 | 14,734,000 | 15,821,000
Total | 44,885,000 | 64,231,000 | 60,730,000
All other expense: |  |  |
Litigation and regulatory matters | 40,517,000 | 30,469,000 | 187,607,000
Travel and entertainment | 11,462,000 | 10,275,000 | 9,590,000
Other insurance and taxes | 9,686,000 | 10,891,000 | 12,941,000
Customer relations | 5,750,000 | 6,255,000 | 5,382,000
Employee training and dues | 5,551,000 | 5,691,000 | 5,390,000
Supplies | 4,106,000 | 4,434,000 | 3,827,000
Tax credit investments | 3,468,000 | 3,349,000 | 4,582,000
Miscellaneous loan costs | 2,751,000 | 2,586,000 | 2,656,000
OREO | 1,006,000 | 773,000 | 2,104,000
Other | 48,891,000 | 41,568,000 | 34,123,000
Total | 133,188,000 | $ 116,291,000 | $ 268,202,000
Class of Stock [Line Items] |  |  |
Charitable contribution | $ 8,800,000 |  |
Visa Class B Shares |  |  |
Class of Stock [Line Items] |  |  |
Stock issued for charitable contributions (in shares) | 65,000 |  |
Cost basis of shared issued for charitable contribution | $ 0 |  |

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