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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, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Equity [Abstract]        
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, before Tax $ (4,707) $ (3,798) $ (16,083) $ 28,457
Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), after Adjustments, Tax 1,324 1,069 4,524 (8,005)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax (3,383) (2,729) (11,559) 20,452
COMPREHENSIVE INCOME        
Change in fair value of securities available for sale, pre tax amount (10,337) (857) (15,589) 13,598
Change in fair value of securities available for sale, tax (expense) benefit 2,440 148 3,711 (3,265)
Change in fair value of securities available for sale, after tax amount (7,897) (709) (11,878) 10,333
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 (10,337) (857) (15,589) 13,598
Change in fair value of securities available for sale, tax (expense) benefit 2,440 148 3,711 (3,265)
Change in fair value of securities available for sale, after tax amount (7,897) (709) (11,878) 10,333
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax 84 (143) (2,214) 37,674
Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), before Adjustments, Tax (23) 41 624 (10,597)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, after Tax 61 (102) (1,590) 27,077
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax 4,791 4,339 13,869 9,901
Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), Adjustments, Tax (1,347) (1,220) (3,900) (2,784)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax 3,444 3,119 9,969 7,117
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Loss on Termination of Derivatives, before Tax 0 (684) 0 (684)
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)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax 0 (2) 653 (1,392)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, Tax 0 1 (184) 392
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, after Tax 0 (1) 469 (1,000)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax 346 245 1,037 736
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, Tax (97) (69) (291) (207)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, after Tax 249 176 746 529
Amortization of certain costs included in net periodic retirement costs, pre tax amount 44 69 131 207
Amortization of certain costs included in net periodic retirement costs, tax (expense) benefit (13) (19) (37) (58)
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, after Tax 31 50 94 149
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax [1] 390 312 1,821 (449)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax [1] (110) (87) (512) 127
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax [1] 280 225 1,309 (322)
Total other comprehensive income, pre tax amount (14,654) (4,343) (29,851) 41,606
Total other comprehensive income, tax (expense) benefit 3,654 1,130 7,723 (11,143)
Total other comprehensive income, after tax amount (11,000) (3,213) (22,128) 30,463
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Loss on Termination of Derivatives, before Tax $ 0 $ (684) $ 0 $ (684)
[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, 2021		Nine Months Ended
September 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$(10,337)$2,440 $(7,897)$(15,589)$3,711 $(11,878)
Less: net security losses reclassified into other noninterest expense— — — — — — 
Net change in fair value of securities available for sale(10,337)2,440 (7,897)(15,589)3,711 (11,878)
Change in fair value of cash flow hedges84 (23)61 (2,214)624 (1,590)
Less: net cash flow hedge gains reclassified into interest income or interest expense 4,791 (1,347)3,444 13,869 (3,900)9,969 
Net change in fair value of cash flow hedges(4,707)1,324 (3,383)(16,083)4,524 (11,559)
Net unamortized gain related to defined benefit pension and other postretirement adjustments arising during the period— — — 653 (184)469 
Amortization of net actuarial losses346 (97)249 1,037 (291)746 
Amortization of net prior service costs44 (13)31 131 (37)94 
Net change in other comprehensive income for defined benefit postretirement plans (1)390 (110)280 1,821 (512)1,309 
Total other comprehensive loss$(14,654)$3,654 $(11,000)$(29,851)$7,723 $(22,128)
 Three Months Ended
September 30, 2020		Nine Months Ended
September 30, 2020
 Pre Tax
Amount		Tax (Expense)
Benefit		After Tax
Amount		Pre Tax
Amount		Tax (Expense)
Benefit		After Tax
Amount
 (Dollars in thousands)
Change in fair value of securities available for sale$(857)$148 $(709)$13,598 $(3,265)$10,333 
Less: net security losses reclassified into other noninterest expense— — — — — — 
Net change in fair value of securities available for sale(857)148 (709)13,598 (3,265)10,333 
Change in fair value of cash flow hedges(143)41 (102)37,674 (10,597)27,077 
Less: net cash flow hedge gains reclassified into interest income or interest expense 4,339 (1,220)3,119 9,901 (2,784)7,117 
Less: loss on termination of hedge reclassified into noninterest expense(684)192 (492)(684)192 (492)
Net change in fair value of cash flow hedges(3,798)1,069 (2,729)28,457 (8,005)20,452 
Net unamortized loss related to defined benefit pension and other postretirement adjustments arising during the period(2)1 (1)(1,392)392 (1,000)
Amortization of net actuarial losses245 (69)176 736 (207)529 
Amortization of net prior service costs69 (19)50 207 (58)149 
Net change in other comprehensive income for defined benefit postretirement plans (1)312 (87)225 (449)127 (322)
Total other comprehensive income (loss)$(4,343)$1,130 $(3,213)$41,606 $(11,143)$30,463 

(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.