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Accumulated Other Comprehensive Income (Loss) (Tables) | 9 Months Ended
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Sep. 30, 2023
Equity [Abstract] |
Schedule of AOCI | 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
Three Months Ended September 30, 2023 |  |  |  |  |  |  |  |  |
Balance at beginning of period | $ | (701,393) |  |  | $ | (103,144) |  |  | $ | (4,096) |  |  | $ | — |  |  | $ | (808,633) |
Other comprehensive income (loss) before reclassifications | (156,660) |  |  | — |  |  | (11,546) |  |  | — |  |  | (168,206) |
Amounts reclassified from AOCI to income (1) | 178 |  |  | 4,193 |  |  | 3,653 |  |  | — |  |  | 8,024 |
Balance at end of period | $ | (857,875) |  |  | $ | (98,951) |  |  | $ | (11,989) |  |  | $ | — |  |  | $ | (968,815) |
Three Months Ended September 30, 2022 |  |  |  |  |  |  |  |  |
Balance at beginning of period | $ | (437,075) |  |  | $ | (122,199) |  |  | $ | (9,875) |  |  | $ | 16 |  |  | $ | (569,133) |
Other comprehensive income (loss) before reclassifications | (217,401) |  |  | — |  |  | (27,725) |  |  | — |  |  | (245,126) |
Amounts reclassified from AOCI to income (1) | 131 |  |  | 5,121 |  |  | 565 |  |  | (8) |  |  | 5,809 |
Balance at end of period | $ | (654,345) |  |  | $ | (117,078) |  |  | $ | (37,035) |  |  | $ | 8 |  |  | $ | (808,450) |
Nine Months Ended September 30, 2023 |  |  |  |  |  |  |  |  |
Balance at beginning of period | $ | (642,346) |  |  | $ | (112,664) |  |  | $ | (31,549) |  |  | $ | 137 |  |  | $ | (786,422) |
Other comprehensive income (loss) before reclassifications | (219,562) |  |  | 1,325 |  |  | 34,279 |  |  | — |  |  | (183,958) |
Amounts reclassified from AOCI to income (1) | 4,033 |  |  | 12,388 |  |  | (14,719) |  |  | (137) |  |  | 1,565 |
Balance at end of period | $ | (857,875) |  |  | $ | (98,951) |  |  | $ | (11,989) |  |  | $ | — |  |  | $ | (968,815) |
Nine Months Ended September 30, 2022 |  |  |  |  |  |  |  |  |
Balance at beginning of period | $ | (2,950) |  |  | $ | — |  |  | $ | 543 |  |  | $ | 32 |  |  | $ | (2,375) |
Other comprehensive income (loss) before reclassifications | (651,330) |  |  | (125,229) |  |  | (37,473) |  |  | — |  |  | (814,032) |
Amounts reclassified from AOCI to income (1) | (65) |  |  | 8,151 |  |  | (105) |  |  | (24) |  |  | 7,957 |
Balance at end of period | $ | (654,345) |  |  | $ | (117,078) |  |  | $ | (37,035) |  |  | $ | 8 |  |  | $ | (808,450) |
(1)See table below for details about reclassifications to income.
Reclassifications out of AOCI | The following table summarizes the amounts reclassified out of each component of AOCI for the three months ended September 30, 2023 and 2022:
| Three Months Ended September 30, |  |
(dollars in thousands) | 2023 |  | 2022 |  |
Details about AOCI Components | Amount Reclassified from AOCI |  | Affected Line Item in the Statement of Income
Unrealized gains and losses on available-for-sale securities | $ | (241) |  |  | $ | (172) |  |  | Debt securities gains (losses), net
| 63 |  |  | 41 |  |  | Income tax (expense) benefit
| $ | (178) |  |  | $ | (131) |  |  | Net income (loss)
Unrealized gains and losses on held-to-maturity securities | $ | (5,623) |  |  | $ | (6,772) |  |  | Interest income (expense)
| 1,430 |  |  | 1,651 |  |  | Income tax (expense) benefit
| $ | (4,193) |  |  | $ | (5,121) |  |  | Net income (loss)
Gains and losses on hedges Interest rate contracts | $ | (4,927) |  |  | $ | (749) |  |  | Interest income (expense)
| 1,274 |  |  | 184 |  |  | Income tax (expense) benefit
| $ | (3,653) |  |  | $ | (565) |  |  | Net income (loss)
Amortization of defined benefit pension items |  |  |  |  |
Actuarial gains (losses) | $ | — |  |  | $ | 11 |  |  | Salaries and employee benefits
| — |  |  | (3) |  |  | Income tax (expense) benefit
| $ | — |  |  | $ | 8 |  |  | Net income (loss)
Total reclassifications for the period | $ | (8,024) |  |  | $ | (5,809) |  |  | Net income (loss)
The following table summarizes the amounts reclassified out of each component of AOCI for the nine months ended September 30, 2023 and 2022:
| Nine Months Ended September 30, |  |
(dollars in thousands) | 2023 |  | 2022 |  |
Details about AOCI Components | Amount Reclassified from AOCI |  | Affected Line Item in the Statement of Income
Unrealized gains and losses on available-for-sale securities | $ | (5,440) |  |  | $ | 85 |  |  | Debt securities gains (losses), net
| 1,407 |  |  | (20) |  |  | Income tax (expense) benefit
| $ | (4,033) |  |  | $ | 65 |  |  | Net income (loss)
Unrealized gains and losses on held-to-maturity securities | $ | (16,574) |  |  | $ | (10,774) |  |  | Interest income (expense)
| 4,186 |  |  | 2,623 |  |  | Income tax (expense) benefit
| $ | (12,388) |  |  | $ | (8,151) |  |  | Net income (loss)
Gains and losses on hedges Interest rate contracts | $ | 19,893 |  |  | $ | 139 |  |  | Interest income (expense)
| (5,174) |  |  | (34) |  |  | Income tax (expense) benefit
| $ | 14,719 |  |  | $ | 105 |  |  | Net income (loss)
Amortization of defined benefit pension items |  |  |  |  |
Actuarial gains (losses) | $ | 182 |  |  | $ | 32 |  |  | Salaries and employee benefits
| (45) |  |  | (8) |  |  | Income tax (expense) benefit
| $ | 137 |  |  | $ | 24 |  |  | Net income (loss)
Total reclassifications for the period | $ | (1,565) |  |  | $ | (7,957) |  |  | Net income (loss)

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