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Comprehensive Income/Loss (Tables)
 9 Months Ended
Sep. 30, 2021
Equity [Abstract]  
Comprehensive income
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.
Company's accumulated other comprehensive loss, net of tax
Information on the Company’s accumulated other comprehensive income (loss), net of tax, is comprised of the following components as of the dates indicated:
Unrealized Gain (Loss)
on Securities		Unrealized Gain (Loss) on Cash Flow HedgeDefined Benefit Postretirement PlansAccumulated Other Comprehensive Income (Loss)
(Dollars in thousands)
2021
Beginning balance: January 1, 2021$13,255 $33,276 $(5,836)$40,695 
Net change in other comprehensive income (loss)(11,878)(11,559)1,309 (22,128)
Ending balance: September 30, 2021$1,377 $21,717 $(4,527)$18,567 
 2020
Beginning balance: January 1, 2020$4,398 $16,479 $(2,708)$18,169 
Net change in other comprehensive income (loss)10,333 20,452 (322)30,463 
Ending balance: September 30, 2020$14,731 $36,931 $(3,030)$48,632