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Accumulated Other Comprehensive Income (Loss)
 6 Months Ended
Jun. 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 June 30, 2021 and December 31, 2020:
 June 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$45,338 $10,428 $34,910 $102,278 $23,524 $78,754 
Unrealized gains on securities available for sale transferred to held to maturity4,139 952 3,187 5,399 1,242 4,157 
Defined benefit pension items(78,204)(17,987)(60,217)(91,751)(21,103)(70,648)
Total$(28,727)$(6,607)$(22,120)$15,926 $3,663 $12,263 
The following table highlights changes in accumulated other comprehensive (loss) income by component for the three and six months ended June 30, 2021 and 2020:
Three months ended June 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$28,159 $3,791 $(65,621)$(33,671)
Net unrealized gains arising during period18,940 — — 18,940 
Amounts reclassified from accumulated other comprehensive loss(12,189)(604)5,404 (7,389)
Net current period other comprehensive (loss) income6,751 (604)5,404 11,551 
Ending balance$34,910 $3,187 $(60,217)$(22,120)
Three months ended June 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$102,080 $— $(127,692)$(25,612)
Net unrealized gains arising during period21,611 — — 21,611 
Amounts reclassified from accumulated other comprehensive loss(10,589)— 4,926 (5,663)
Net current period other comprehensive income11,022 — 4,926 15,948 
Ending balance$113,102 $— $(122,766)$(9,664)
Six months ended June 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(24,566)— — (24,566)
Amounts reclassified from accumulated other comprehensive income(19,278)(970)10,431 (9,817)
Net current period other comprehensive (loss) income(43,844)(970)10,431 (34,383)
Ending balance$34,910 $3,187 $(60,217)$(22,120)
Six months ended June 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 period133,141 — — 133,141 
Amounts reclassified from accumulated other comprehensive loss(25,831)— 9,749 (16,082)
Net current period other comprehensive income107,310 — 9,749 117,059 
Ending balance$113,102 $— $(122,766)$(9,664)
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 six months ended June 30, 2021 and 2020:
(Dollars in thousands)Three months ended June 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$15,830 Realized gains on investment securities available for sale, net
(3,641)Income taxes
$12,189 
Accretion of unrealized gains on securities available for sale transferred to held to maturity$785 Net interest income
(181)Income taxes
$604 
Amortization of defined benefit pension actuarial losses(7,018)Other noninterest expense
1,614 Income taxes
$(5,404)
Total reclassifications for the period$7,389 
(Dollars in thousands)Three months ended June 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$13,752 Realized gains on investment securities available for sale, net
(3,163)Income taxes
$10,589 
Amortization of defined benefit pension actuarial losses(6,398)Other noninterest expense
1,472 Income taxes
$(4,926)
Total reclassifications for the period$5,663 
Six months ended June 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$25,037 Realized gains on investment securities available for sale, net
(5,759)Income taxes
$19,278 
Amortization of unrealized losses on securities available for sale transferred to held to maturity$1,260 Net interest income
(290)Income taxes
$970 
Amortization of defined benefit pension actuarial losses$(13,547)Other noninterest expense
3,116 Income taxes
$(10,431)
Total reclassifications for the period$9,817 
Six months ended June 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$33,547 Realized gains on investment securities available for sale, net
(7,716)Income taxes
$25,831 
Amortization of defined benefit pension actuarial losses(12,662)Other noninterest expense
2,913 Income taxes
$(9,749)
Total reclassifications for the period$16,082