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Accumulated Other Comprehensive (Loss) Income (Tables) | 9 Months Ended
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Sep. 30, 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 September 30, 2025 |  |  |  |  |
Net unrealized gains on investment securities(1) | $ | 49,911 |  |  | $ | (11,305) |  |  | $ | 38,606 |
Amortization of net unrealized gains on AFS investment securities transferred to HTM(2) | 1,719 |  |  | (389) |  |  | 1,330 |
Net unrealized holding losses arising during the period on interest rate derivatives used in cash flow hedges | (373) |  |  | 84 |  |  | (289) |
Reclassification adjustment for net change realized in net income on interest rate derivatives used in cash flow hedges | 5,929 |  |  | (1,343) |  |  | 4,586 |
Amortization of net unrecognized pension and postretirement items(3) | (139) |  |  | 33 |  |  | (106) |
Total Other Comprehensive Income | $ | 57,047 |  |  | $ | (12,920) |  |  | $ | 44,127 |
Three months ended September 30, 2024 |  |  |  |  |
Net unrealized gains on investment securities(1) | $ | 88,637 |  |  | $ | (20,077) |  |  | $ | 68,560 |
Reclassification adjustment for securities net change included in net income(2) | 1 |  |  | — |  |  | 1 |
Amortization of net unrealized gains on AFS investment securities transferred to HTM(2) | 1,837 |  |  | (415) |  |  | 1,422 |
Net unrealized holding losses arising during the period on interest rate derivatives used in cash flow hedges | (8,564) |  |  | 1,940 |  |  | (6,624) |
Reclassification adjustment for net change realized in net income on interest rate derivatives used in cash flow hedges | 5,144 |  |  | (1,165) |  |  | 3,979 |
Amortization of net unrecognized pension and postretirement items(3) | (135) |  |  | 29 |  |  | (106) |
Total Other Comprehensive Income | $ | 86,920 |  |  | $ | (19,688) |  |  | $ | 67,232 |
Nine months ended September 30, 2025 |  |  |  |  |
Net unrealized gains on investment securities(1) | $ | 55,615 |  |  | $ | (12,597) |  |  | $ | 43,018 |
Reclassification adjustment for securities net change included in net income(2) | 2 |  |  | — |  |  | 2 |
Amortization of net unrealized gains on AFS investment securities transferred to HTM(2) | 5,171 |  |  | (1,171) |  |  | 4,000 |
Net unrealized holding gains arising during the period on interest rate derivatives used in cash flow hedges | 1,964 |  | (445) |  |  | 1,519 |
Reclassification adjustment for net change realized in net income on interest rate swaps used in cash flow hedges | 15,587 |  |  | (3,531) |  |  | 12,056 |
Amortization of net unrecognized pension and postretirement item(3) | (411) |  |  | 93 |  |  | (318) |
Total Other Comprehensive Income | $ | 77,928 |  |  | $ | (17,651) |  |  | $ | 60,277 |
Nine months ended September 30, 2024 |  |  |  |  |
Net unrealized gains on investment securities(1) | $ | 48,735 |  |  | $ | (11,039) |  |  | $ | 37,696 |
Reclassification adjustment for securities net change included in net income(2) | 20,283 |  |  | (4,594) |  |  | 15,689 |
Amortization of net unrealized gains on AFS investment securities transferred to HTM(2) | 5,445 |  |  | (1,233) |  |  | 4,212 |
Net unrealized holding losses arising during the period on interest rate derivatives used in cash flow hedges | (92) |  |  | 21 |  |  | (71) |
Reclassification adjustment for change realized in net income on interest rate swaps used in cash flow hedges | 15,158 |  |  | (3,389) |  |  | 11,769 |
Amortization of net unrecognized pension and postretirement items(3) | (406) |  |  | 89 |  |  | (317) |
Total Other Comprehensive Income | $ | 89,123 |  |  | $ | (20,145) |  |  | $ | 68,978 |
(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 September 30, 2025 |  |  |  |  |  |  |  |  |
Balance at June 30, 2025 | $ | (268,905) |  |  | $ | (6,774) |  |  |  |  | $ | 4,010 |  |  | $ | (271,669) |
OCI before reclassifications | 38,606 |  |  | (289) |  |  |  |  | — |  |  | 38,317 |
Amounts reclassified from AOCI | — |  |  | 4,586 |  |  |  |  | (106) |  |  | 4,480 |
Amortization of net unrealized gains on AFS investment securities transferred to HTM | 1,330 |  |  | — |  |  |  |  | — |  |  | 1,330 |
Balance at September 30, 2025 | $ | (228,969) |  |  | $ | (2,477) |  |  |  |  | $ | 3,904 |  |  | $ | (227,542) |
Three months ended September 30, 2024 |  |  |  |  |  |  |  |  |
Balance at June 30, 2024 | $ | (287,248) |  |  | $ | (20,440) |  |  |  |  | $ | (2,846) |  |  | $ | (310,534) |
OCI before reclassifications | 68,560 |  |  | (6,624) |  |  |  |  | — |  |  | 61,936 |
Amounts reclassified from AOCI | 1 |  |  | 3,979 |  |  |  |  | (106) |  |  | 3,874 |
Amortization of net unrealized gains on AFS investment securities transferred to HTM | 1,422 |  |  | — |  |  |  |  | — |  |  | 1,422 |
Balance at September 30, 2024 | $ | (217,265) |  |  | $ | (23,085) |  |  |  |  | $ | (2,952) |  |  | $ | (243,302) |
Nine months ended September 30, 2025 |  |  |  |  |  |  |  |  |
Balance at December 31, 2024 | $ | (275,989) |  |  | $ | (16,052) |  |  |  |  | $ | 4,222 |  |  | $ | (287,819) |
OCI before reclassifications | 43,018 |  |  | 1,519 |  |  |  |  | — |  |  | 44,537 |
Amounts reclassified from AOCI | 2 |  |  | 12,056 |  |  |  |  | (318) |  |  | 11,740 |
Amortization of net unrealized gains on AFS investment securities transferred to HTM | 4,000 |  |  | — |  |  |  |  | — |  |  | 4,000 |
Balance at September 30, 2025 | $ | (228,969) |  |  | $ | (2,477) |  |  |  |  | $ | 3,904 |  |  | $ | (227,542) |
Nine months ended September 30, 2024 |  |  |  |  |  |  |  |  |
Balance at December 31, 2023 | $ | (274,862) |  |  | $ | (34,783) |  |  |  |  | $ | (2,635) |  |  | $ | (312,280) |
OCI before reclassifications | 37,696 |  |  | (71) |  |  |  |  | — |  |  | 37,625 |
Amounts reclassified from AOCI | 15,689 |  |  | 11,769 |  |  |  |  | (317) |  |  | 27,141 |
Amortization of net unrealized gains on AFS investment securities transferred to HTM | 4,212 |  |  | — |  |  |  |  | — |  |  | 4,212 |
Balance at September 30, 2024 | $ | (217,265) |  |  | $ | (23,085) |  |  |  |  | $ | (2,952) |  |  | $ | (243,302) |

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