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Comprehensive Income/Loss
 9 Months Ended
Sep. 30, 2020
Equity [Abstract]  
COMPREHENSIVE INCOME/LOSS OTHER COMPREHENSIVE INCOME (LOSS)
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)$10,333 
Less: net security losses reclassified into other noninterest expense— — — — — — 
Net change in fair value of securities available for sale(857)148 (709)13,598 (3,265)10,333 
Change in fair value of cash flow hedges(143)41 (102)37,674 (10,597)27,077 
Less: net cash flow hedge gains reclassified into interest income or interest expense 4,339 (1,220)3,119 9,901 (2,784)7,117 
Less: Loss on termination of hedge reclassified into noninterest expense(684)192 (492)(684)192 (492)
Net change in fair value of cash flow hedges(3,798)1,069 (2,729)28,457 (8,005)20,452 
Net unamortized loss related to defined benefit pension and other postretirement adjustments arising during the period(2)1 (1)(1,392)392 (1,000)
Amortization of net actuarial losses245 (69)176 736 (207)529 
Amortization of net prior service costs69 (19)50 207 (58)149 
Net change in other comprehensive income for defined benefit postretirement plans (1)312 (87)225 (449)127 (322)
Total other comprehensive income (loss)$(4,343)$1,130 $(3,213)$41,606 $(11,143)$30,463 
 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 sale2,858 (683)2,175 16,161 (3,812)12,349 
Change in fair value of cash flow hedges4,568 (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 hedges4,216 (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 costs69 (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.
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 on Cash Flow HedgeDefined Benefit Postretirement PlansAccumulated Other Comprehensive Income (Loss)
(Dollars in thousands)
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)$48,632 
 2019
Beginning balance: January 1, 2019$(5,947)$6,148 $(1,374)$(1,173)
Net change in other comprehensive income (loss)12,349 14,905 121 27,375 
Ending balance: September 30, 2019$6,402 $21,053 $(1,253)$26,202