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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, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Equity [Abstract] |  |  |  |  |
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, before Tax |  | $ 274 | $ 11,955 | $ 32,255 | $ 16,527
Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), after Adjustments, Tax |  | (77) | (3,365) | (9,074) | (4,652)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax |  | 197 | 8,590 | 23,181 | 11,875
COMPREHENSIVE INCOME |  |  |  |  |
Change in fair value of securities available for sale, pre tax amount |  | 2,332 | 5,663 | 14,455 | 11,841
Change in fair value of securities available for sale, tax (expense) benefit |  | (637) | (1,269) | (3,413) | (2,718)
Change in fair value of securities available for sale, after tax amount |  | 1,695 | 4,394 | 11,042 | 9,123
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax |  | 0 | (1,462) | 0 | (1,462)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax |  | 0 | 411 | 0 | 411
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax |  | 0 | (1,051) | 0 | (1,051)
Change in fair value of securities available for sale, pre tax amount |  | 2,332 | 7,125 | 14,455 | 13,303
Change in fair value of securities available for sale, tax (expense) benefit |  | (637) | (1,680) | (3,413) | (3,129)
Change in fair value of securities available for sale, after tax amount |  | 1,695 | 5,445 | 11,042 | 10,174
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax |  | 4,250 | 12,349 | 37,817 | 17,345
Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), before Adjustments, Tax |  | (1,195) | (3,476) | (10,638) | (4,882)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, after Tax |  | 3,055 | 8,873 | 27,179 | 12,463
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax |  | 3,976 | 394 | 5,562 | 818
Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), Adjustments, Tax |  | (1,118) | (111) | (1,564) | (230)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax |  | 2,858 | 283 | 3,998 | 588
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax |  | (1) | (11) | (1,390) | (22)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, Tax |  | 0 | 3 | 391 | 6
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, after Tax |  | (1) | (8) | (999) | (16)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax |  | 246 | (2) | 491 | (4)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, Tax |  | (69) |  | (138) | 1
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, after Tax |  | 177 | (2) | 353 | (3)
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 |  | (20) | (19) | (39) | (39)
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, after Tax |  | 49 | 50 | 99 | 99
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax | [1] | 314 | 56 | (761) | 112
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax | [1] | (89) | (16) | 214 | (32)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax | [1] | 225 | 40 | (547) | 80
Total other comprehensive income, pre tax amount |  | 2,920 | 19,136 | 45,949 | 29,942
Total other comprehensive income, tax (expense) benefit |  | (803) | (5,061) | (12,273) | (7,813)
Total other comprehensive income, after tax amount |  | $ 2,117 | $ 14,075 | $ 33,676 | $ 22,129
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