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Accumulated Other Comprehensive Income (Loss)
 9 Months Ended
Sep. 30, 2020
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Accumulated Other Comprehensive Loss ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)
Accumulated other comprehensive income (loss) included the following as of September 30, 2020 and December 31, 2019:
 September 30, 2020December 31, 2019
(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$135,240 $31,105 $104,135 $7,522 $1,730 $5,792 
Defined benefit pension items(153,104)(35,213)(117,891)(172,098)(39,583)(132,515)
Total$(17,864)$(4,108)$(13,756)$(164,576)$(37,853)$(126,723)
The following table highlights changes in accumulated other comprehensive income (loss) by component for the three and nine months ended September 30, 2020 and 2019:
Three months ended September 30, 2020
(Dollars in thousands, net of tax)Unrealized gains (losses) on securities available for saleUnrealized losses 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 (loss) income(8,967)— 4,875 (4,092)
Ending balance$104,135 $— $(117,891)$(13,756)
Three months ended September 30, 2019
(Dollars in thousands, net of tax)Unrealized gains (losses) on securities available for saleUnrealized losses on securities available for sale transferred to held to maturityDefined benefit pension itemsTotal
Beginning balance$2,554 $(61,979)$(121,306)$(180,731)
Net unrealized gains arising during period3,026 — — 3,026 
Amounts reclassified from accumulated other comprehensive loss(874)4,693 2,114 5,933 
Net current period other comprehensive income2,152 4,693 2,114 8,959 
Ending balance$4,706 $(57,286)$(119,192)$(171,772)
Nine months ended September 30, 2020
(Dollars in thousands, net of tax)Unrealized gains on securities available for saleUnrealized losses 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)
Nine months ended September 30, 2019
(Dollars in thousands, net of tax)Unrealized gains on securities available for saleUnrealized losses on securities available for sale transferred to held to maturityDefined benefit pension itemsTotal
Beginning balance$(38,505)$(71,149)$(125,533)$(235,187)
Net unrealized gains arising during period48,489 — — 48,489 
Amounts reclassified from accumulated other comprehensive loss(5,278)13,863 6,341 14,926 
Net current period other comprehensive income43,211 13,863 6,341 63,415 
Ending balance$4,706 $(57,286)$(119,192)$(171,772)
The following table presents the amounts reclassified from accumulated other comprehensive income (loss) and the line item affected in the statement where net income is presented for the three and nine months ended September 30, 2020 and 2019:
(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 
Three months ended September 30, 2019
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$1,136 Realized gains on investment securities available for sale, net
(262)Income taxes
$874 
Amortization of unrealized losses on securities available for sale transferred to held to maturity$(6,095)Net interest income
1,402 Income taxes
$(4,693)
Amortization of defined benefit pension items
Prior service costs$(15)Salaries and wages
Actuarial losses(2,730)Other noninterest expense
(2,745)Income before income taxes
631 Income taxes
$(2,114)
Total reclassifications for the period$(5,933)
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
$42,328 
Amortization of defined benefit pension items
Actuarial losses$(18,994)Other
4,370 Income taxes
$(14,624)
Total reclassifications for the period$27,704 
Nine months ended September 30, 2019
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$6,855 Realized gains on investment securities available for sale, net
(1,577)Income taxes
$5,278 Net income
Amortization of unrealized losses on securities available for sale transferred to held to maturity$(18,004)Net interest income
4,141 Income taxes
$(13,863)
Amortization of defined benefit pension items
Prior service costs$(43)Salaries and wages
Actuarial losses(8,192)Other noninterest expense
(8,235)Income before income taxes
1,894 Income taxes
$(6,341)
Total reclassifications for the period$(14,926)