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Accumulated Other Comprehensive Loss | 12 Months Ended
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Dec. 31, 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 at December 31, 2020 and 2019:
| December 31, 2020 |  | December 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 | $ | 102,278 |  |  | $ | 23,524 |  |  | $ | 78,754 |  |  | $ | 7,522 |  |  | $ | 1,730 |  |  | $ | 5,792 |
Unrealized gains on securities available for sale transferred from (to) held to maturity | 5,399 |  |  | 1,242 |  |  | 4,157 |  |  | — |  |  | — |  |  | — |
Defined benefit pension items | (91,751) |  |  | (21,103) |  |  | (70,648) |  |  | (172,098) |  |  | (39,583) |  |  | (132,515) |
Total | $ | 15,926 |  |  | $ | 3,663 |  |  | $ | 12,263 |  |  | $ | (164,576) |  |  | $ | (37,853) |  |  | $ | (126,723) |
The following table highlights changes in accumulated other comprehensive income (loss) by component for the years ended December 31, 2020 and 2019:
(Dollars in thousands) |  |  | Unrealized gains (losses) on securities available-for-sale(1) |  | Unrealized gains (losses) on securities available for sale transferred to held to maturity(1)(2) |  | Defined benefit pension items(1) |  | Total
Balance at January 1, 2019 |  |  | $ | (38,505) |  |  | $ | (71,149) |  |  | $ | (125,533) |  |  | $ | (235,187) |
Net unrealized gains (losses) arising during period |  |  | 49,776 |  |  | 55,834 |  |  | (15,438) |  |  | 90,172 |
Amounts reclassified from accumulated other comprehensive loss |  |  | (5,479) |  |  | 15,315 |  |  | 8,456 |  |  | 18,292 |
Net current period other comprehensive income (loss) |  |  | 44,297 |  |  | 71,149 |  |  | (6,982) |  |  | 108,464 |
Balance at December 31, 2019 |  |  | 5,792 |  |  | — |  |  | (132,515) |  |  | (126,723) |
Net unrealized gains arising during period |  |  | 119,357 |  |  | 4,538 |  |  | 42,367 |  |  | 166,262 |
Amounts reclassified from accumulated other comprehensive loss |  |  | (46,395) |  |  | (381) |  |  | 19,500 |  |  | (27,276) |
Net current period other comprehensive income |  |  | 72,962 |  |  | 4,157 |  |  | 61,867 |  |  | 138,986 |
Balance at December 31, 2020 |  |  | $ | 78,754 |  |  | $ | 4,157 |  |  | $ | (70,648) |  |  | $ | 12,263 |
(1) All amounts are net of tax. Amounts in parentheses indicate debits. (2) Net unrealized gains (losses) represent unrealized gains and losses related to the reclassification of investment securities between categories. See Note C, Investments, for additional information. 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 years ended December 31, 2020 and 2019:
(Dollars in thousands) |  | Year ended December 31, 2020
Details about accumulated other comprehensive income (loss) |  | Amount reclassified from accumulated other comprehensive income (loss)(1) |  | Affected line item in the statement where net income is presented
Unrealized gains on available for sale securities |  | $ | 60,253 |  |  | Realized gains on investment securities available for sale, net
|  | (13,858) |  |  | Income taxes
|  | $ | 46,395 |  |  |
Amortization of unrealized gains on securities available for sale transferred to held to maturity |  | $ | 495 |  |  | Net interest income
|  | (114) |  |  | Income taxes
|  | $ | 381 |  |  |
Amortization of actuarial losses on defined benefit pension items |  | $ | (25,324) |  |  | Other noninterest expense
|  | 5,824 |  |  | Income taxes
|  | $ | (19,500) |  |  |
Total reclassifications for the period |  | $ | 27,276 |  |  |
|  | Year ended December 31, 2019
Details about accumulated other comprehensive (loss) income |  | Amount reclassified from accumulated other comprehensive income (loss)(1) |  | Affected line item in the statement where net income is presented
Unrealized gains on available for sale securities |  | $ | 7,115 |  |  | Realized gains on investment securities available for sale, net
|  | (1,636) |  |  | Income taxes
|  | $ | 5,479 |  |  |
Amortization of unrealized losses on securities available for sale transferred to held to maturity |  | $ | (19,889) |  |  | Net interest income
|  | 4,574 |  |  | Income taxes
|  | $ | (15,315) |  |  |
Amortization of defined benefit pension items |  |  |  |
Prior service costs |  | $ | (57) |  |  | Salaries and wages
Actuarial losses |  | (10,924) |  |  | Other noninterest expense
|  | (10,981) |  |  | Income before income taxes
|  | 2,525 |  |  | Income taxes
|  | $ | (8,456) |  |  |
Total reclassifications for the period |  | $ | (18,292) |  |  |
(1) Amounts in parentheses indicate debits to profit/loss.

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- Definition The entire disclosure for comprehensive income, which includes, but is not limited to, 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -URI http://asc.fasb.org/topic&trid=2134417 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(21)) -URI http://asc.fasb.org/extlink&oid=120395209&loc=SL114868664-224227 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(23)) -URI http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -URI http://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263 + Details
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