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Comprehensive Income/Loss (Comprehensive Income/(Loss) Presented Net of Taxes) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Equity [Abstract] |  |  |  |  |
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, before Tax |  | $ (3,798) | $ 4,216 | $ 28,457 | $ 20,743
Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), after Adjustments, Tax |  | 1,069 | (1,186) | (8,005) | (5,838)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax |  | (2,729) | 3,030 | 20,452 | 14,905
COMPREHENSIVE INCOME |  |  |  |  |
Change in fair value of securities available for sale, pre tax amount |  | (857) | 2,858 | 13,598 | 14,699
Change in fair value of securities available for sale, tax (expense) benefit |  | 148 | (683) | (3,265) | (3,401)
Change in fair value of securities available for sale, after tax amount |  | (709) | 2,175 | 10,333 | 11,298
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax |  | 0 | 0 | 0 | (1,462)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax |  | 0 | 0 | 0 | 411
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax |  | 0 | 0 | 0 | (1,051)
Change in fair value of securities available for sale, pre tax amount |  | (857) | 2,858 | 13,598 | 16,161
Change in fair value of securities available for sale, tax (expense) benefit |  | 148 | (683) | (3,265) | (3,812)
Change in fair value of securities available for sale, after tax amount |  | (709) | 2,175 | 10,333 | 12,349
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax |  | (143) | 4,568 | 37,674 | 21,913
Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), before Adjustments, Tax |  | 41 | (1,285) | (10,597) | (6,167)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, after Tax |  | (102) | 3,283 | 27,077 | 15,746
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax |  | 4,339 | 352 | 9,901 | 1,170
Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), Adjustments, Tax |  | (1,220) | (99) | (2,784) | (329)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax |  | 3,119 | 253 | 7,117 | 841
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Loss on Termination of Derivatives, After Tax |  | (492) |  | (492) |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Loss on Termination of Derviatives, Tax |  | (192) |  | (192) |
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax |  | (2) | (11) | (1,392) | (33)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, Tax |  | 1 | 3 | 392 | 9
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, after Tax |  | (1) | (8) | (1,000) | (24)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax |  | 245 | (2) | 736 | (6)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, Tax |  | (69) | 1 | (207) | 2
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, after Tax |  | 176 | (1) | 529 | (4)
Amortization of certain costs included in net periodic retirement costs, pre tax amount |  | 69 | 69 | 207 | 207
Amortization of certain costs included in net periodic retirement costs, tax (expense) benefit |  | (19) | (19) | (58) | (58)
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, after Tax |  | 50 | 50 | 149 | 149
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax | [1] | 312 | 56 | (449) | 168
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax | [1] | (87) | (15) | 127 | (47)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax | [1] | 225 | 41 | (322) | 121
Total other comprehensive income, pre tax amount |  | (4,343) | 7,130 | 41,606 | 37,072
Total other comprehensive income, tax (expense) benefit |  | 1,130 | (1,884) | (11,143) | (9,697)
Total other comprehensive income, after tax amount |  | (3,213) | 5,246 | 30,463 | 27,375
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Loss on Termination of Derivatives, before Tax |  | (684) | 0 | (684) | 0
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Loss on Termination of Derivatives, before Tax |  | (684) | $ 0 | (684) | $ 0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Loss on Termination of Derviatives, Tax |  | (192) |  | (192) |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Loss on Termination of Derivatives, After Tax |  | $ (492) |  | $ (492) |
[1] | The following tables present a reconciliation of the changes in the components of other comprehensive income (loss) for the periods indicated, including the amount of income tax (expense) benefit allocated to each component of other comprehensive income (loss):
| Three Months Ended September 30, 2020 |  | Nine Months Ended September 30, 2020
| Pre Tax Amount |  | Tax (Expense) Benefit |  | After Tax Amount |  | Pre Tax Amount |  | Tax (Expense) Benefit |  | After Tax Amount
| (Dollars in thousands)
Change in fair value of securities available for sale | $ | (857) |  |  | $ | 148 |  |  | $ | (709) |  |  | $ | 13,598 |  |  | $ | (3,265) |  |  | $ | 10,333 |
Less: net security losses reclassified into other noninterest expense | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Net change in fair value of securities available for sale | (857) |  |  | 148 |  |  | (709) |  |  | 13,598 |  |  | (3,265) |  |  | 10,333 |
Change in fair value of cash flow hedges | (143) |  |  | 41 |  |  | (102) |  |  | 37,674 |  |  | (10,597) |  |  | 27,077 |
Less: net cash flow hedge gains reclassified into interest income or interest expense | 4,339 |  |  | (1,220) |  |  | 3,119 |  |  | 9,901 |  |  | (2,784) |  |  | 7,117 |
Less: Loss on termination of hedge reclassified into noninterest expense | (684) |  |  | 192 |  |  | (492) |  |  | (684) |  |  | 192 |  |  | (492) |
Net change in fair value of cash flow hedges | (3,798) |  |  | 1,069 |  |  | (2,729) |  |  | 28,457 |  |  | (8,005) |  |  | 20,452 |
Net unamortized loss related to defined benefit pension and other postretirement adjustments arising during the period | (2) |  |  | 1 |  |  | (1) |  |  | (1,392) |  |  | 392 |  |  | (1,000) |
Amortization of net actuarial losses | 245 |  |  | (69) |  |  | 176 |  |  | 736 |  |  | (207) |  |  | 529 |
Amortization of net prior service costs | 69 |  |  | (19) |  |  | 50 |  |  | 207 |  |  | (58) |  |  | 149 |
Net change in other comprehensive income for defined benefit postretirement plans (1) | 312 |  |  | (87) |  |  | 225 |  |  | (449) |  |  | 127 |  |  | (322) |
Total other comprehensive income (loss) | $ | (4,343) |  |  | $ | 1,130 |  |  | $ | (3,213) |  |  | $ | 41,606 |  |  | $ | (11,143) |  |  | $ | 30,463 |
| Three Months Ended September 30, 2019 |  | Nine Months Ended September 30, 2019
| Pre Tax Amount |  | Tax (Expense) Benefit |  | After Tax Amount |  | Pre Tax Amount |  | Tax (Expense) Benefit |  | After Tax Amount
| (Dollars in thousands)
Change in fair value of securities available for sale | $ | 2,858 |  |  | $ | (683) |  |  | $ | 2,175 |  |  | $ | 14,699 |  |  | $ | (3,401) |  |  | $ | 11,298 |
Less: net security losses reclassified into other noninterest expense | — |  |  | — |  |  | — |  |  | (1,462) |  |  | 411 |  |  | (1,051) |
Net change in fair value of securities available for sale | 2,858 |  |  | (683) |  |  | 2,175 |  |  | 16,161 |  |  | (3,812) |  |  | 12,349 |
Change in fair value of cash flow hedges | 4,568 |  |  | (1,285) |  |  | 3,283 |  |  | 21,913 |  |  | (6,167) |  |  | 15,746 |
Less: net cash flow hedge gains reclassified into interest income or interest expense | 352 |  |  | (99) |  |  | 253 |  |  | 1,170 |  |  | (329) |  |  | 841 |
Net change in fair value of cash flow hedges | 4,216 |  |  | (1,186) |  |  | 3,030 |  |  | 20,743 |  |  | (5,838) |  |  | 14,905 |
Net unamortized loss related to defined benefit pension and other postretirement adjustments arising during the period | (11) |  |  | 3 |  |  | (8) |  |  | (33) |  |  | 9 |  |  | (24) |
Amortization of net actuarial gains | (2) |  |  | 1 |  |  | (1) |  |  | (6) |  |  | 2 |  |  | (4) |
Amortization of net prior service costs | 69 |  |  | (19) |  |  | 50 |  |  | 207 |  |  | (58) |  |  | 149 |
Net change in other comprehensive income for defined benefit postretirement plans (1) | 56 |  |  | (15) |  |  | 41 |  |  | 168 |  |  | (47) |  |  | 121 |
Total other comprehensive income | $ | 7,130 |  |  | $ | (1,884) |  |  | $ | 5,246 |  |  | $ | 37,072 |  |  | $ | (9,697) |  |  | $ | 27,375 |
(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, 2019, filed with the Securities and Exchange Commission.

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