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Accumulated Other Comprehensive Income (Loss)
 9 Months Ended
Sep. 30, 2021
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Accumulated Other Comprehensive Loss ACCUMULATED OTHER COMPREHENSIVE (LOSS) INCOME
Accumulated other comprehensive (loss) income included the following as of September 30, 2021 and December 31, 2020:
 September 30, 2021December 31, 2020
(Dollars in thousands)Accumulated
other
comprehensive
income (loss)		Deferred
tax
expense
(benefit)		Accumulated
other
comprehensive
income (loss),
net of tax		Accumulated
other
comprehensive
income (loss)		Deferred
tax
expense
(benefit)		Accumulated
other
comprehensive
income (loss),
net of tax
Unrealized gains on securities available for sale$25,986 $5,977 $20,009 $102,278 $23,524 $78,754 
Unrealized gains on securities available for sale transferred to held to maturity3,709 853 2,856 5,399 1,242 4,157 
Defined benefit pension items(71,431)(16,429)(55,002)(91,751)(21,103)(70,648)
Total$(41,736)$(9,599)$(32,137)$15,926 $3,663 $12,263 
The following table highlights changes in accumulated other comprehensive (loss) income by component for the three and nine months ended September 30, 2021 and 2020:
Three months ended September 30, 2021
(Dollars in thousands, net of tax)Unrealized gains (losses) on securities available for saleUnrealized gains on securities available for sale transferred to held to maturityDefined benefit pension itemsTotal
Beginning balance$34,910 $3,187 $(60,217)$(22,120)
Net unrealized losses arising during period(8,677)— — (8,677)
Amounts reclassified from accumulated other comprehensive loss(6,224)(331)5,215 (1,340)
Net current period other comprehensive (loss) income(14,901)(331)5,215 (10,017)
Ending balance$20,009 $2,856 $(55,002)$(32,137)
Three months ended September 30, 2020
(Dollars in thousands, net of tax)Unrealized gains (losses) on securities available for saleUnrealized gains on securities available for sale transferred to held to maturityDefined benefit pension itemsTotal
Beginning balance$113,102 $— $(122,766)$(9,664)
Net unrealized gains arising during period7,530 — — 7,530 
Amounts reclassified from accumulated other comprehensive loss(16,497)— 4,875 (11,622)
Net current period other comprehensive income(8,967)— 4,875 (4,092)
Ending balance$104,135 $— $(117,891)$(13,756)
Nine months ended September 30, 2021
(Dollars in thousands, net of tax)Unrealized gains on securities available for saleUnrealized gains on securities available for sale transferred to held to maturityDefined benefit pension itemsTotal
Beginning balance$78,754 $4,157 $(70,648)$12,263 
Net unrealized losses arising during period(33,243)— — (33,243)
Amounts reclassified from accumulated other comprehensive income(25,502)(1,301)15,646 (11,157)
Net current period other comprehensive (loss) income(58,745)(1,301)15,646 (44,400)
Ending balance$20,009 $2,856 $(55,002)$(32,137)
Nine months ended September 30, 2020
(Dollars in thousands, net of tax)Unrealized gains on securities available for saleUnrealized gains on securities available for sale transferred to held to maturityDefined benefit pension itemsTotal
Beginning balance$5,792 $— $(132,515)$(126,723)
Net unrealized gains arising during period140,671 — — 140,671 
Amounts reclassified from accumulated other comprehensive loss(42,328)— 14,624 (27,704)
Net current period other comprehensive income98,343 — 14,624 112,967 
Ending balance$104,135 $— $(117,891)$(13,756)
The following table presents the amounts reclassified from accumulated other comprehensive (loss) income and the line item affected in the statement where net income is presented for the three and nine months ended September 30, 2021 and 2020:
(Dollars in thousands)Three months ended September 30, 2021
Details about accumulated other comprehensive income (loss) Amounts reclassified from accumulated other comprehensive income (loss)Affected line item in the statement where net income is presented
Unrealized gains on securities available for sale$8,082 Realized gains on investment securities available for sale, net
(1,858)Income taxes
$6,224 
Accretion of unrealized gains on securities available for sale transferred to held to maturity$430 Net interest income
(99)Income taxes
$331 
Amortization of defined benefit pension actuarial losses(6,773)Other noninterest expense
1,558 Income taxes
$(5,215)
Total reclassifications for the period$1,340 
(Dollars in thousands)Three months ended September 30, 2020
Details about accumulated other comprehensive income (loss) Amounts reclassified from accumulated other comprehensive income (loss)Affected line item in the statement where net income is presented
Unrealized gains on securities available for sale$21,425 Realized gains on investment securities available for sale, net
(4,928)Income taxes
$16,497 
Amortization of defined benefit pension actuarial losses(6,332)Other noninterest expense
1,457 Income taxes
$(4,875)
Total reclassifications for the period$11,622 
(Dollars in thousands)Nine months ended September 30, 2021
Details about accumulated other comprehensive income (loss) Amounts reclassified from accumulated other comprehensive income (loss)Affected line item in the statement where net income is presented
Unrealized gains on securities available for sale$33,119 Realized gains on investment securities available for sale, net
(7,617)Income taxes
$25,502 
Amortization of unrealized losses on securities available for sale transferred to held to maturity$1,690 Net interest income
(389)Income taxes
$1,301 
Amortization of defined benefit pension actuarial losses$(20,320)Other noninterest expense
4,674 Income taxes
$(15,646)
Total reclassifications for the period$11,157 
(Dollars in thousands)Nine months ended September 30, 2020
Details about accumulated other comprehensive income (loss) Amounts reclassified from accumulated other comprehensive income (loss)Affected line item in the statement where net income is presented
Unrealized gains on securities available for sale$54,972 Realized gains on investment securities available for sale, net
(12,644)Income taxes
$42,328 
Amortization of defined benefit pension actuarial losses(18,994)Other noninterest expense
4,370 Income taxes
$(14,624)
Total reclassifications for the period$27,704