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Accumulated Other Comprehensive Income (Tables) | 6 Months Ended
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Jun. 30, 2025
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] |
Components of Other Comprehensive Income | The following table presents the components of other comprehensive income for the three and six months ended June 30, 2025 and 2024:
(dollars in thousands) | Before Tax | Tax Effect | Net of Tax
Three Months Ended June 30, 2025 |  |  |
Net Unrealized Gains on Investment Securities: |  |  |
Net Unrealized Gains Arising During the Period | $ | 19,927 |  | $ | 5,281 |  | $ | 14,646 |
Amounts Reclassified from Accumulated Other Comprehensive Income that Decrease Net Income: |  |  |
Amortization of Unrealized Holding Losses on Held-to-Maturity Securities | 5,884 |  | 1,560 |  | 4,324 |
Net Unrealized Gains on Investment Securities | 25,811 |  | 6,841 |  | 18,970 |
Defined Benefit Plans: |  |  |
Amortization of Net Actuarial Losses | 378 |  | 100 |  | 278 |
Amortization of Prior Service Credit | (61) |  | (16) |  | (45) |
Defined Benefit Plans, Net | 317 |  | 84 |  | 233 |
Other Comprehensive Income | $ | 26,128 |  | $ | 6,925 |  | $ | 19,203 |
Three Months Ended June 30, 2024 |  |  |
Net Unrealized Gains on Investment Securities: |  |  |
Net Unrealized Gains Arising During the Period | $ | 6,022 |  | $ | 1,595 |  | $ | 4,427 |
Amounts Reclassified from Accumulated Other Comprehensive Income that Decrease Net Income: |  |  |
Amortization of Unrealized Holding Losses on Held-to-Maturity Securities | 6,294 |  | 1,669 |  | 4,625 |
Net Unrealized Gains on Investment Securities | 12,316 |  | 3,264 |  | 9,052 |
Defined Benefit Plans: |  |  |
Amortization of Net Actuarial Losses | 291 |  | 78 |  | 213 |
Amortization of Prior Service Credit | (61) |  | (16) |  | (45) |
Defined Benefit Plans, Net | 230 |  | 62 |  | 168 |
Other Comprehensive Income | $ | 12,546 |  | $ | 3,326 |  | $ | 9,220 |
Six Months Ended June 30, 2025 |  |  |
Net Unrealized Gains on Investment Securities: |  |  |
Net Unrealized Gains Arising During the Period | $ | 47,920 |  | $ | 12,699 |  | $ | 35,221 |
Amounts Reclassified from Accumulated Other Comprehensive Income that Decrease Net Income: |  |  |
Amortization of Unrealized Holding Losses on Held-to-Maturity Securities | 11,578 |  | 3,069 |  | 8,509 |
Net Unrealized Gains on Investment Securities | 59,498 |  | 15,768 |  | 43,730 |
Defined Benefit Plans: |  |  |
Amortization of Net Actuarial Losses | 755 |  | 200 |  | 555 |
Amortization of Prior Service Credit | (123) |  | (33) |  | (90) |
Defined Benefit Plans, Net | 632 |  | 167 |  | 465 |
Other Comprehensive Income | $ | 60,130 |  | $ | 15,935 |  | $ | 44,195 |
Six Months Ended June 30, 2024 |  |  |
Net Unrealized Gains on Investment Securities: |  |  |
Net Unrealized Gains Arising During the Period | $ | 17,426 |  | $ | 4,619 |  | $ | 12,807 |
Amounts Reclassified from Accumulated Other Comprehensive Income that Decrease Net Income: |  |  |
Amortization of Unrealized Holding Losses on Held-to-Maturity Securities | 12,496 |  | 3,313 |  | 9,183 |
Net Unrealized Gains on Investment Securities | 29,922 |  | 7,932 |  | 21,990 |
Defined Benefit Plans: |  |  |
Amortization of Net Actuarial Losses | 582 |  | 155 |  | 427 |
Amortization of Prior Service Credit | (122) |  | (32) |  | (90) |
Defined Benefit Plans, Net | 460 |  | 123 |  | 337 |
Other Comprehensive Income | $ | 30,382 |  | $ | 8,055 |  | $ | 22,327 |
Schedule of Accumulated Other Comprehensive Income (Loss) | The following table presents the changes in each component of accumulated other comprehensive income, net of tax, for the three and six months ended June 30, 2025 and 2024:
(dollars in thousands) | Investment Securities-Available-for-Sale | Investment Securities-Held-to-Maturity | Defined Benefit Plans | Accumulated Other Comprehensive Income (Loss)
Three Months Ended June 30, 2025 |  |  |  |
Balance at Beginning of Period | $ | (168,655) |  | $ | (126,578) |  | $ | (23,164) |  | $ | (318,397) |
Other Comprehensive Income Before Reclassifications | 14,646 |  | — |  | — |  | 14,646 |
Amounts Reclassified from Accumulated Other Comprehensive Income | — |  | 4,324 |  | 233 |  | 4,557 |
Total Other Comprehensive Income | 14,646 |  | 4,324 |  | 233 |  | 19,203 |
Balance at End of Period | $ | (154,009) |  | $ | (122,254) |  | $ | (22,931) |  | $ | (299,194) |
Three Months Ended June 30, 2024 |  |  |  |
Balance at Beginning of Period | $ | (216,027) |  | $ | (144,463) |  | $ | (23,091) |  | $ | (383,581) |
Other Comprehensive Income Before Reclassifications | 4,427 |  | — |  | — |  | 4,427 |
Amounts Reclassified from Accumulated Other Comprehensive Income | — |  | 4,625 |  | 168 |  | 4,793 |
Total Other Comprehensive Income | 4,427 |  | 4,625 |  | 168 |  | 9,220 |
Balance at End of Period | $ | (211,600) |  | $ | (139,838) |  | $ | (22,923) |  | $ | (374,361) |
Six Months Ended June 30, 2025 |  |  |  |
Balance at Beginning of Period | $ | (189,230) |  | $ | (130,763) |  | $ | (23,396) |  | $ | (343,389) |
Other Comprehensive Income Before Reclassifications | 35,221 |  | — |  | — |  | 35,221 |
Amounts Reclassified from Accumulated Other Comprehensive Income | — |  | 8,509 |  | 465 |  | 8,974 |
Total Other Comprehensive Income | 35,221 |  | 8,509 |  | 465 |  | 44,195 |
Balance at End of Period | $ | (154,009) |  | $ | (122,254) |  | $ | (22,931) |  | $ | (299,194) |
Six Months Ended June 30, 2024 |  |  |  |
Balance at Beginning of Period | $ | (224,407) |  | $ | (149,021) |  | $ | (23,260) |  | $ | (396,688) |
Other Comprehensive Income Before Reclassifications | 12,807 |  | — |  | — |  | 12,807 |
Amounts Reclassified from Accumulated Other Comprehensive Income | — |  | 9,183 |  | 337 |  | 9,520 |
Total Other Comprehensive Income | 12,807 |  | 9,183 |  | 337 |  | 22,327 |
Balance at End of Period | $ | (211,600) |  | $ | (139,838) |  | $ | (22,923) |  | $ | (374,361) |
Reclassification out of Accumulated Other Comprehensive Income | The following table presents the amounts reclassified out of each component of accumulated other comprehensive income for the three and six months ended June 30, 2025 and 2024:
Details about Accumulated Other Comprehensive Income Components | Amount Reclassified from Accumulated Other Comprehensive Income 1 |  | Affected Line Item in the Statement Where Net Income Is Presented
| Three Months Ended June 30, |  |
(dollars in thousands) | 2025 |  | 2024 |  |
Amortization of Unrealized Holding Losses on Investment Securities Held-to-Maturity | $ | (5,884) |  |  | $ | (6,294) |  |  | Interest Income
| 1,560 |  |  | 1,669 |  |  | Provision for Income Tax
| (4,324) |  |  | (4,625) |  |  | Net of Tax
Amortization of Defined Benefit Plan Items |  |  |  |  |
Prior Service Credit 2 | 61 |  |  | 61 |  |  |
Net Actuarial Losses 2 | (378) |  |  | (291) |  |  |
| (317) |  |  | (230) |  |  | Total Before Tax
| 84 |  |  | 62 |  |  | Provision for Income Tax
| (233) |  |  | (168) |  |  | Net of Tax
Total Reclassifications for the Period | $ | (4,557) |  |  | $ | (4,793) |  |  | Net of Tax
Details about Accumulated Other Comprehensive Income Components | Amount Reclassified from Accumulated Other Comprehensive Income 1 |  | Affected Line Item in the Statement Where Net Income Is Presented
| Six Months Ended June 30, |  |
(dollars in thousands) | 2025 |  | 2024 |  |
Amortization of Unrealized Holding Losses on Investment Securities Held-to-Maturity | $ | (11,578) |  |  | $ | (12,496) |  |  | Interest Income
| 3,069 |  |  | 3,313 |  |  | Provision for Income Tax
| (8,509) |  |  | (9,183) |  |  | Net of Tax
Amortization of Defined Benefit Plan Items |  |  |  |  |
Prior Service Credit 2 | 123 |  |  | 122 |  |  |
Net Actuarial Losses 2 | (755) |  |  | (582) |  |  |
| (632) |  |  | (460) |  |  | Total Before Tax
| 167 |  |  | 123 |  |  | Provision for Income Tax
| (465) |  |  | (337) |  |  | Net of Tax
Total Reclassifications for the Period | $ | (8,974) |  |  | $ | (9,520) |  |  | Net of Tax
1 Amounts in parentheses indicate reductions to net income. 2 These accumulated other comprehensive income components are included in the computation of net periodic benefit cost and are included in other noninterest expense in the unaudited consolidated statements of income.

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- Definition Tabular disclosure of components of comprehensive income (loss). Includes, but is not limited to, foreign currency translation adjustments, foreign currency transactions designated as economic hedges of a net investment in foreign entity, gain (loss) and prior service cost (credit) for pension plans and other postretirement benefit plans. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Paragraph 1 -Section 45 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482790/220-10-45-1 + Details
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