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Accumulated Other Comprehensive (Loss) Income (Tables) | 3 Months Ended
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Mar. 31, 2025
Equity [Abstract] |
Changes in other comprehensive income (loss) | The following table presents the components of OCI:
| Before-Tax Amount |  | Tax Effect |  | Net of Tax Amount
| (dollars in thousands)
Three months ended March 31, 2025 |  |  |  |  |
Net unrealized gains on investment securities(1) | $ | 12,630 |  |  | $ | (2,861) |  |  | $ | 9,769 |
Reclassification adjustment for investment securities net change included in net income(2) | 2 |  |  | — |  |  | 2 |
Amortization of net unrealized gains (losses) on AFS investment securities transferred to HTM(2) | 1,716 |  |  | (388) |  |  | 1,328 |
Net unrealized holding gains (losses) arising during the period on interest rate derivatives used in cash flow hedges | 2,281 |  |  | (517) |  |  | 1,764 |
Reclassification adjustment for net change realized in net income on interest rate derivatives used in cash flow hedges | 4,544 |  |  | (1,029) |  |  | 3,515 |
Amortization of net unrecognized pension and postretirement items(3) | (136) |  |  | 30 |  |  | (106) |
Total Other Comprehensive Income | $ | 21,037 |  |  | $ | (4,765) |  |  | $ | 16,272 |
Three months ended March 31, 2024 |  |  |  |  |
Net unrealized losses on investment securities(1) | $ | (21,546) |  |  | $ | 4,881 |  |  | $ | (16,665) |
Amortization of net unrealized gains (losses) on AFS investment securities transferred to HTM(2) | 1,793 |  |  | (406) |  |  | 1,387 |
Net unrealized holding gains (losses) arising during the period on interest rate derivatives used in cash flow hedges | 5,556 |  |  | (1,259) |  |  | 4,297 |
Reclassification adjustment for net change realized in net income on interest rate derivatives used in cash flow hedges | 5,012 |  |  | (1,113) |  |  | 3,899 |
Amortization of net unrecognized pension and postretirement items(3) | (135) |  |  | 29 |  |  | (106) |
Total Other Comprehensive Loss | $ | (9,320) |  |  | $ | 2,132 |  |  | $ | (7,188) |
(1) Amounts reclassified out of AOCI. Before-tax amounts included in "Investment securities (losses) gains, net" on the Consolidated Statements of Income. (2) Amounts reclassified out of AOCI. Before-tax amounts included as a reduction to "Interest Income - Investment Securities" in on the Consolidated Statements of Income. (3) Amounts reclassified out of AOCI. Before-tax amounts included in "Salaries and employee benefits" on the Consolidated Statements of Income.
Changes in each component of accumulated other comprehensive income (loss) | The following table presents changes in each component of AOCI, net of tax:
| Unrealized Gains (Losses) on Investment Securities |  | Net Unrealized Gain (Loss) on Interest Rate Derivatives used in Cash Flow Hedges |  |  |  | Unrecognized Pension and Postretirement Plan Income (Costs) |  | Total
| (dollars in thousands)
Three months ended March 31, 2025 |  |  |  |  |  |  |  |  |
Balance at December 31, 2024 | $ | (275,989) |  |  | $ | (16,052) |  |  |  |  | $ | 4,222 |  |  | $ | (287,819) |
OCI before reclassifications | 9,769 |  |  | 1,764 |  |  |  |  | — |  |  | 11,533 |
Amounts reclassified from AOCI | 2 |  |  | 3,515 |  |  |  |  | (106) |  |  | 3,411 |
Amortization of net unrealized gains (losses) on AFS investment securities transferred to HTM | 1,328 |  |  | — |  |  |  |  | — |  |  | 1,328 |
Balance at March 31, 2025 | $ | (264,890) |  |  | $ | (10,773) |  |  |  |  | $ | 4,116 |  |  | $ | (271,547) |
Three months ended March 31, 2024 |  |  |  |  |  |  |  |  |
Balance at December 31, 2023 | $ | (274,862) |  |  | $ | (34,783) |  |  |  |  | $ | (2,635) |  |  | $ | (312,280) |
OCI before reclassifications | (16,665) |  |  | 4,297 |  |  |  |  | — |  |  | (12,368) |
Amounts reclassified from AOCI | — |  |  | 3,899 |  |  |  |  | (106) |  |  | 3,793 |
Amortization of net unrealized gains (losses) on AFS investment securities transferred to HTM | 1,387 |  |  | — |  |  |  |  | — |  |  | 1,387 |
Balance at March 31, 2024 | $ | (290,140) |  |  | $ | (26,587) |  |  |  |  | $ | (2,741) |  |  | $ | (319,468) |

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