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Comprehensive Income/Loss (Comprehensive Income/(Loss) Presented Net of Taxes) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Equity [Abstract] |  |  |  |  |
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, before Tax |  | $ 11,955 | $ (157) | $ 16,527 | $ 139
Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), after Adjustments, Tax |  | (3,365) | 45 | (4,652) | (36)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax |  | 8,590 | (112) | 11,875 | 103
COMPREHENSIVE INCOME |  |  |  |  |
Change in fair value of securities available for sale, pre tax amount |  | 5,663 | (2,533) | 11,841 | (9,773)
Change in fair value of securities available for sale, tax (expense) benefit |  | (1,269) | 609 | (2,718) | 2,381
Change in fair value of securities available for sale, after tax amount |  | 4,394 | (1,924) | 9,123 | (7,392)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax |  | (1,462) | 0 | (1,462) | 0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax |  | 411 | 0 | 411 | 0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax |  | (1,051) | 0 | (1,051) | 0
Change in fair value of securities available for sale, pre tax amount |  | 7,125 | (2,533) | 13,303 | (9,773)
Change in fair value of securities available for sale, tax (expense) benefit |  | (1,680) | 609 | (3,129) | 2,381
Change in fair value of securities available for sale, after tax amount |  | 5,445 | (1,924) | 10,174 | (7,392)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax |  | 12,349 | 10 | 17,345 | 396
Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), before Adjustments, Tax |  | (3,476) | (2) | (4,882) | (108)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, after Tax |  | 8,873 | 8 | 12,463 | 288
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax |  | 394 | 167 | 818 | 257
Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), Adjustments, Tax |  | (111) | (47) | (230) | (72)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax |  | 283 | 120 | 588 | 185
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax |  | (11) |  | (22) |
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, Tax |  | 3 |  | 6 |
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, after Tax |  | (8) |  | (16) |
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax |  | (2) | 93 | (4) | 187
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, Tax |  |  | (27) | 1 | (53)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, after Tax |  | (2) | 66 | (3) | 134
Amortization of certain costs included in net periodic retirement costs, pre tax amount |  | 69 | 69 | 138 | 138
Amortization of certain costs included in net periodic retirement costs, tax (expense) benefit |  | (19) | (18) | (39) | (38)
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, after Tax |  | 50 | 51 | 99 | 100
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax | [1] | 56 | 162 | 112 | 325
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax | [1] | (16) | (45) | (32) | (91)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax | [1] | 40 | 117 | 80 | 234
Total other comprehensive income, pre tax amount |  | 19,136 | (2,528) | 29,942 | (9,309)
Total other comprehensive income, tax (expense) benefit |  | (5,061) | 609 | (7,813) | 2,254
Total other comprehensive income, after tax amount |  | $ 14,075 | $ (1,919) | $ 22,129 | $ (7,055)
[1] | The amortization of prior service costs is included in the computation of net periodic pension cost as disclosed in the Employee Benefit Plans footnote in the Company's Annual Report on Form 10-K for the year ended December 31, 2018, filed with the Securities and Exchange Commission.

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