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Accumulated Other Comprehensive Income (Loss) | 12 Months Ended
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Dec. 31, 2023
Equity [Abstract] |
Accumulated Other Comprehensive Income (Loss) | ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) The following table summarizes the changes within each classification of AOCI, net of tax:
(dollars in thousands) | Unrealized Gains and Losses on Available- for-Sale Debt Securities |  | Unrealized Gains and Losses on Held-to- Maturity Securities |  | Gains and Losses on Hedges |  | Defined Benefit Pension Plans |  | Total
Year Ended December 31, 2023 |  |  |  |  |  |  |  |  |
Balance at beginning of period | $ | (642,346) |  |  | $ | (112,664) |  |  | $ | (31,549) |  |  | $ | 137 |  |  | $ | (786,422) |
Other comprehensive income (loss) before reclassifications | (14,817) |  |  | 1,325 |  |  | 51,871 |  |  | — |  |  | 38,379 |
Amounts reclassified from AOCI to income (1) | 4,645 |  |  | 15,867 |  |  | (11,141) |  |  | (137) |  |  | 9,234 |
Balance at end of period | $ | (652,518) |  |  | $ | (95,472) |  |  | $ | 9,181 |  |  | $ | — |  |  | $ | (738,809) |
Year Ended December 31, 2022 |  |  |  |  |  |  |  |  |
Balance at beginning of period | $ | (2,950) |  |  | $ | — |  |  | $ | 543 |  |  | $ | 32 |  |  | $ | (2,375) |
Other comprehensive income (loss) before reclassifications | (639,463) |  |  | (125,229) |  |  | (34,043) |  |  | — |  |  | (798,735) |
Amounts reclassified from AOCI to income (1) | 67 |  |  | 12,565 |  |  | 1,951 |  |  | 105 |  |  | 14,688 |
Balance at end of period | $ | (642,346) |  |  | $ | (112,664) |  |  | $ | (31,549) |  |  | $ | 137 |  |  | $ | (786,422) |
Year Ended December 31, 2021 |  |  |  |  |  |  |  |  |
Balance at beginning of period | $ | 145,335 |  |  | $ | — |  |  | $ | 2,584 |  |  | $ | (148) |  |  | $ | 147,771 |
Other comprehensive income (loss) before reclassifications | (144,948) |  |  | — |  |  | 1,433 |  |  | — |  |  | (143,515) |
Amounts reclassified from AOCI to income (1) | (3,337) |  |  | — |  |  | (3,474) |  |  | 180 |  |  | (6,631) |
Balance at end of period | $ | (2,950) |  |  | $ | — |  |  | $ | 543 |  |  | $ | 32 |  |  | $ | (2,375) |
(1)See table below for details about reclassifications to income. The following table summarizes the significant amounts reclassified out of each component of AOCI:
| Years Ended December 31, |  |
(dollars in thousands) | 2023 |  | 2022 |  | 2021 |  |
Details about AOCI Components | Amount Reclassified from AOCI |  | Affected Line Item in the Statement of Income
Unrealized gains and losses on available-for-sale debt securities | $ | (6,265) |  |  | $ | (88) |  |  | $ | 4,327 |  |  | Debt securities gains (losses), net
| 1,620 |  |  | 21 |  |  | (990) |  |  | Income tax (expense) benefit
| $ | (4,645) |  |  | $ | (67) |  |  | $ | 3,337 |  |  | Net income
Amortization of unrealized losses on held-to-maturity securities transferred from available-for-sale | $ | (21,239) |  |  | $ | (16,612) |  |  | $ | — |  |  | Interest income (expense)
| 5,372 |  |  | 4,047 |  |  | — |  |  | Income tax (expense) benefit
| $ | (15,867) |  |  | $ | (12,565) |  |  | $ | — |  |  | Net income
Gains and losses on hedges Interest rate contracts | $ | 15,067 |  |  | $ | (2,587) |  |  | $ | 4,605 |  |  | Interest income (expense)
| (3,926) |  |  | 636 |  |  | (1,131) |  |  | Income tax (expense) benefit
| $ | 11,141 |  |  | $ | (1,951) |  |  | $ | 3,474 |  |  | Net income
Amortization of defined benefit pension items |  |  |  |  |  |  |
Actuarial gains (losses) | $ | 182 |  |  | $ | (139) |  |  | $ | (239) |  |  | Salaries and employee benefits
| (45) |  |  | 34 |  |  | 59 |  |  | Income tax (expense) benefit
| $ | 137 |  |  | $ | (105) |  |  | $ | (180) |  |  | Net income
Total reclassifications for the period | $ | (9,234) |  |  | $ | (14,688) |  |  | $ | 6,631 |  |  | Net income

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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://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477250/944-220-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(21)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(23)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478524/942-220-S99-1 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/220/tableOfContent + Details
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