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Accumulated Other Comprehensive Income (Tables) | 9 Months Ended
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Sep. 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 nine months ended September 30, 2025 and 2024:
(dollars in thousands) | Before Tax | Tax Effect | Net of Tax
Three Months Ended September 30, 2025 |  |  |
Net Unrealized Gains on Investment Securities: |  |  |
Net Unrealized Gains Arising During the Period | $ | 25,105 |  | $ | 6,654 |  | $ | 18,451 |
Amounts Reclassified from Accumulated Other Comprehensive Income that Decrease Net Income: |  |  |
Amortization of Unrealized Holding Losses on Held-to-Maturity Securities | 5,796 |  | 1,536 |  | 4,260 |
Net Unrealized Gains on Investment Securities | 30,901 |  | 8,190 |  | 22,711 |
Defined Benefit Plans: |  |  |
Amortization of Net Actuarial Losses | 378 |  | 100 |  | 278 |
Amortization of Prior Service Credit | (61) |  | (15) |  | (46) |
Defined Benefit Plans, Net | 317 |  | 85 |  | 232 |
Other Comprehensive Income | $ | 31,218 |  | $ | 8,275 |  | $ | 22,943 |
Three Months Ended September 30, 2024 |  |  |
Net Unrealized Gains on Investment Securities: |  |  |
Net Unrealized Gains Arising During the Period | $ | 46,623 |  | $ | 12,352 |  | $ | 34,271 |
Amounts Reclassified from Accumulated Other Comprehensive Income that Decrease Net Income: |  |  |
Amortization of Unrealized Holding Losses on Held-to-Maturity Securities | 6,207 |  | 1,645 |  | 4,562 |
Net Unrealized Gains on Investment Securities | 52,830 |  | 13,997 |  | 38,833 |
Defined Benefit Plans: |  |  |
Amortization of Net Actuarial Losses | 291 |  | 77 |  | 214 |
Amortization of Prior Service Credit | (62) |  | (16) |  | (46) |
Defined Benefit Plans, Net | 229 |  | 61 |  | 168 |
Other Comprehensive Income | $ | 53,059 |  | $ | 14,058 |  | $ | 39,001 |
Nine Months Ended September 30, 2025 |  |  |
Net Unrealized Gains on Investment Securities: |  |  |
Net Unrealized Gains Arising During the Period | $ | 73,024 |  | $ | 19,352 |  | $ | 53,672 |
Amounts Reclassified from Accumulated Other Comprehensive Income that Decrease Net Income: |  |  |
Amortization of Unrealized Holding Losses on Held-to-Maturity Securities | 17,374 |  | 4,605 |  | 12,769 |
Net Unrealized Gains on Investment Securities | 90,398 |  | 23,957 |  | 66,441 |
Defined Benefit Plans: |  |  |
Amortization of Net Actuarial Losses | 1,133 |  | 300 |  | 833 |
Amortization of Prior Service Credit | (184) |  | (48) |  | (136) |
Defined Benefit Plans, Net | 949 |  | 252 |  | 697 |
Other Comprehensive Income | $ | 91,347 |  | $ | 24,209 |  | $ | 67,138 |
Nine Months Ended September 30, 2024 |  |  |
Net Unrealized Gains on Investment Securities: |  |  |
Net Unrealized Gains Arising During the Period | $ | 64,049 |  | $ | 16,971 |  | $ | 47,078 |
Amounts Reclassified from Accumulated Other Comprehensive Income that Decrease Net Income: |  |  |
Amortization of Unrealized Holding Losses on Held-to-Maturity Securities | 18,703 |  | 4,958 |  | 13,745 |
Net Unrealized Gains on Investment Securities | 82,752 |  | 21,929 |  | 60,823 |
Defined Benefit Plans: |  |  |
Amortization of Net Actuarial Losses | 873 |  | 232 |  | 641 |
Amortization of Prior Service Credit | (184) |  | (48) |  | (136) |
Defined Benefit Plans, Net | 689 |  | 184 |  | 505 |
Other Comprehensive Income | $ | 83,441 |  | $ | 22,113 |  | $ | 61,328 |
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 nine months ended September 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 September 30, 2025 |  |  |  |
Balance at Beginning of Period | $ | (154,009) |  | $ | (122,254) |  | $ | (22,931) |  | $ | (299,194) |
Other Comprehensive Income Before Reclassifications | 18,451 |  | — |  | — |  | 18,451 |
Amounts Reclassified from Accumulated Other Comprehensive Income | — |  | 4,260 |  | 232 |  | 4,492 |
Total Other Comprehensive Income | 18,451 |  | 4,260 |  | 232 |  | 22,943 |
Balance at End of Period | $ | (135,558) |  | $ | (117,994) |  | $ | (22,699) |  | $ | (276,251) |
Three Months Ended September 30, 2024 |  |  |  |
Balance at Beginning of Period | $ | (211,600) |  | $ | (139,838) |  | $ | (22,923) |  | $ | (374,361) |
Other Comprehensive Income Before Reclassifications | 34,271 |  | — |  | — |  | 34,271 |
Amounts Reclassified from Accumulated Other Comprehensive Income | — |  | 4,562 |  | 168 |  | 4,730 |
Total Other Comprehensive Income | 34,271 |  | 4,562 |  | 168 |  | 39,001 |
Balance at End of Period | $ | (177,329) |  | $ | (135,276) |  | $ | (22,755) |  | $ | (335,360) |
Nine Months Ended September 30, 2025 |  |  |  |
Balance at Beginning of Period | $ | (189,230) |  | $ | (130,763) |  | $ | (23,396) |  | $ | (343,389) |
Other Comprehensive Income Before Reclassifications | 53,672 |  | — |  | — |  | 53,672 |
Amounts Reclassified from Accumulated Other Comprehensive Income | — |  | 12,769 |  | 697 |  | 13,466 |
Total Other Comprehensive Income | 53,672 |  | 12,769 |  | 697 |  | 67,138 |
Balance at End of Period | $ | (135,558) |  | $ | (117,994) |  | $ | (22,699) |  | $ | (276,251) |
Nine Months Ended September 30, 2024 |  |  |  |
Balance at Beginning of Period | $ | (224,407) |  | $ | (149,021) |  | $ | (23,260) |  | $ | (396,688) |
Other Comprehensive Income Before Reclassifications | 47,078 |  | — |  | — |  | 47,078 |
Amounts Reclassified from Accumulated Other Comprehensive Income | — |  | 13,745 |  | 505 |  | 14,250 |
Total Other Comprehensive Income | 47,078 |  | 13,745 |  | 505 |  | 61,328 |
Balance at End of Period | $ | (177,329) |  | $ | (135,276) |  | $ | (22,755) |  | $ | (335,360) |
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 nine months ended September 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 September 30, |  |
(dollars in thousands) | 2025 |  | 2024 |  |
Amortization of Unrealized Holding Losses on Investment Securities Held-to-Maturity | $ | (5,796) |  |  | $ | (6,207) |  |  | Interest Income
| 1,536 |  |  | 1,645 |  |  | Provision for Income Tax
| (4,260) |  |  | (4,562) |  |  | Net of Tax
Amortization of Defined Benefit Plan Items |  |  |  |  |
Prior Service Credit | 61 |  |  | 62 |  |  | Other Noninterest Expense
Net Actuarial Losses | (378) |  |  | (291) |  |  | Other Noninterest Expense
| (317) |  |  | (229) |  |  | Total Before Tax
| 85 |  |  | 61 |  |  | Provision for Income Tax
| (232) |  |  | (168) |  |  | Net of Tax
Total Reclassifications for the Period | $ | (4,492) |  |  | $ | (4,730) |  |  | 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
| Nine Months Ended September 30, |  |
(dollars in thousands) | 2025 |  | 2024 |  |
Amortization of Unrealized Holding Losses on Investment Securities Held-to-Maturity | $ | (17,374) |  |  | $ | (18,703) |  |  | Interest Income
| 4,605 |  |  | 4,958 |  |  | Provision for Income Tax
| (12,769) |  |  | (13,745) |  |  | Net of Tax
Amortization of Defined Benefit Plan Items |  |  |  |  |
Prior Service Credit | 184 |  |  | 184 |  |  | Other Noninterest Expense
Net Actuarial Losses | (1,133) |  |  | (873) |  |  | Other Noninterest Expense
| (949) |  |  | (689) |  |  | Total Before Tax
| 252 |  |  | 184 |  |  | Provision for Income Tax
| (697) |  |  | (505) |  |  | Net of Tax
Total Reclassifications for the Period | $ | (13,466) |  |  | $ | (14,250) |  |  | Net of Tax
1 Amounts in parentheses indicate reductions to net income.

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