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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, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Equity [Abstract]        
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, before Tax $ (2,217) $ 274 $ (11,376) $ 32,255
Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), after Adjustments, Tax 624 (77) 3,200 (9,074)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax (1,593) 197 (8,176) 23,181
COMPREHENSIVE INCOME        
Change in fair value of securities available for sale, pre tax amount 5,109 2,332 (5,252) 14,455
Change in fair value of securities available for sale, tax (expense) benefit (1,316) (637) 1,271 (3,413)
Change in fair value of securities available for sale, after tax amount 3,793 1,695 (3,981) 11,042
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax 0 0 0 0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax 0 0 0 0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax 0 0 0 0
Change in fair value of securities available for sale, pre tax amount 5,109 2,332 (5,252) 14,455
Change in fair value of securities available for sale, tax (expense) benefit (1,316) (637) 1,271 (3,413)
Change in fair value of securities available for sale, after tax amount 3,793 1,695 (3,981) 11,042
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax 2,481 4,250 (2,298) 37,817
Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), before Adjustments, Tax (697) (1,195) 647 (10,638)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, after Tax 1,784 3,055 (1,651) 27,179
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax 4,698 3,976 9,078 5,562
Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), Adjustments, Tax (1,321) (1,118) (2,553) (1,564)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax 3,377 2,858 6,525 3,998
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax 0 (1) 653 (1,390)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, Tax 0 0 (184) 391
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, after Tax 0 (1) 469 (999)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax 249 246 691 491
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, Tax (70) (69) (194) (138)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, after Tax 179 177 497 353
Amortization of certain costs included in net periodic retirement costs, pre tax amount 43 69 87 138
Amortization of certain costs included in net periodic retirement costs, tax (expense) benefit (12) (20) (24) (39)
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, after Tax 31 49 63 99
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax [1] 292 314 1,431 (761)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax [1] (82) (89) (402) 214
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax [1] 210 225 1,029 (547)
Total other comprehensive income, pre tax amount 3,184 2,920 (15,197) 45,949
Total other comprehensive income, tax (expense) benefit (774) (803) 4,069 (12,273)
Total other comprehensive income, after tax amount 2,410 2,117 (11,128) 33,676
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Loss on Termination of Derivatives, before Tax 0 0 0 0
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Loss on Termination of Derivatives, before Tax $ 0 $ 0 $ 0 $ 0
[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
June 30, 2021		Six Months Ended
June 30, 2021
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$5,109 $(1,316)$3,793 $(5,252)$1,271 $(3,981)
Less: net security losses reclassified into other noninterest expense— — — — — — 
Net change in fair value of securities available for sale5,109 (1,316)3,793 (5,252)1,271 (3,981)
Change in fair value of cash flow hedges2,481 (697)1,784 (2,298)647 (1,651)
Less: net cash flow hedge gains reclassified into interest income or interest expense 4,698 (1,321)3,377 9,078 (2,553)6,525 
Net change in fair value of cash flow hedges(2,217)624 (1,593)(11,376)3,200 (8,176)
Net unamortized gain related to defined benefit pension and other postretirement adjustments arising during the period— — — 653 (184)469 
Amortization of net actuarial losses249 (70)179 691 (194)497 
Amortization of net prior service costs43 (12)31 87 (24)63 
Net change in other comprehensive income for defined benefit postretirement plans (1)292 (82)210 1,431 (402)1,029 
Total other comprehensive income (loss)$3,184 $(774)$2,410 $(15,197)$4,069 $(11,128)
 Three Months Ended
June 30, 2020		Six Months Ended
June 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$2,332 $(637)$1,695 $14,455 $(3,413)$11,042 
Less: net security losses reclassified into other noninterest expense— — — — — — 
Net change in fair value of securities available for sale2,332 (637)1,695 14,455 (3,413)11,042 
Change in fair value of cash flow hedges4,250 (1,195)3,055 37,817 (10,638)27,179 
Less: net cash flow hedge gains reclassified into interest income or interest expense 3,976 (1,118)2,858 5,562 (1,564)3,998 
Net change in fair value of cash flow hedges274 (77)197 32,255 (9,074)23,181 
Net unamortized loss related to defined benefit pension and other postretirement adjustments arising during the period(1)— (1)(1,390)391 (999)
Amortization of net actuarial losses246 (69)177 491 (138)353 
Amortization of net prior service costs69 (20)49 138 (39)99 
Net change in other comprehensive income for defined benefit postretirement plans (1)314 (89)225 (761)214 (547)
Total other comprehensive income (loss)$2,920 $(803)$2,117 $45,949 $(12,273)$33,676 
(1)The amortization of prior service costs is included in the computation of net periodic pension cost as disclosed in Note 15 "Employee Benefit Plans" within the Notes to the Consolidated Financial Statements included in Item 8 of the Company's 2020 Form 10-K.