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Accumulated Other Comprehensive Income (Loss) (Tables) | 3 Months Ended
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Mar. 31, 2024
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 (loss) for the three months ended March 31, 2024, and March 31, 2023:
(dollars in thousands) |  | Before Tax |  |  | Tax Effect |  |  | Net of Tax |
Three Months Ended March 31, 2024 |  |  |  |  |  |  |  |  |
Net Unrealized Gains (Losses) on Investment Securities: |  |  |  |  |  |  |  |  |
Net Unrealized Gains (Losses) Arising During the Period |  | $ | 11,404 |  |  | $ | 3,024 |  |  | $ | 8,380 |
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) that (Increase) Decrease Net Income: |  |  |  |  |  |  |  |  |
Amortization of Unrealized Holding (Gains) Losses on Held-to- Maturity Securities 1 |  |  | 6,202 |  |  |  | 1,644 |  |  |  | 4,558 |
Net Unrealized Gains (Losses) on Investment Securities |  |  | 17,606 |  |  |  | 4,668 |  |  |  | 12,938 |
Defined Benefit Plans: |  |  |  |  |  |  |  |  |
Amortization of Net Actuarial Losses (Gains) |  |  | 291 |  |  |  | 77 |  |  |  | 214 |
Amortization of Prior Service Credit |  |  | (61 | ) |  |  | (16 | ) |  |  | (45 | )
Defined Benefit Plans, Net |  |  | 230 |  |  |  | 61 |  |  |  | 169 |
Other Comprehensive Income (Loss) |  | $ | 17,836 |  |  | $ | 4,729 |  |  | $ | 13,107 |
Three Months Ended March 31, 2023 |  |  |  |  |  |  |  |  |
Net Unrealized Gains (Losses) on Investment Securities: |  |  |  |  |  |  |  |  |
Net Unrealized Gains (Losses) Arising During the Period |  | $ | 32,918 |  |  | $ | 8,723 |  |  | $ | 24,195 |
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) that (Increase) Decrease Net Income: |  |  |  |  |  |  |  |  |
Amortization of Unrealized Holding (Gains) Losses on Held-to- Maturity Securities 1 |  |  | 6,913 |  |  |  | 1,832 |  |  |  | 5,081 |
Net Unrealized Gains (Losses) on Investment Securities |  |  | 39,831 |  |  |  | 10,555 |  |  |  | 29,276 |
Defined Benefit Plans: |  |  |  |  |  |  |  |  |
Amortization of Net Actuarial Losses (Gains) |  |  | 175 |  |  |  | 47 |  |  |  | 128 |
Amortization of Prior Service Credit |  |  | (61 | ) |  |  | (17 | ) |  |  | (44 | )
Defined Benefit Plans, Net |  |  | 114 |  |  |  | 30 |  |  |  | 84 |
Other Comprehensive Income (Loss) |  | $ | 39,945 |  |  | $ | 10,585 |  |  | $ | 29,360 |
1 These amounts relate to the amortization/accretion of unrealized net gains and losses related to the Company’s reclassification of available-for-sale investment securities to the held-to-maturity category. The unrealized net gains/losses will be amortized/accreted over the remaining life of the investment securities as an adjustment of yield.
Schedule of Accumulated Other Comprehensive Income (Loss) | The following table presents the changes in each component of accumulated other comprehensive income (loss), net of tax, for the three months ended March 31, 2024, and March 31, 2023:
(dollars in thousands) |  | Investment Securities- Available- for-Sale |  |  | Investment Securities- Held-to-Maturity |  |  | Defined Benefit Plans |  |  | Accumulated Other Comprehensive Income (Loss) |
Three Months Ended March 31, 2024 |  |  |  |  |  |  |  |  |  |  |  |
Balance at Beginning of Period |  | $ | (224,407 | ) |  | $ | (149,021 | ) |  | $ | (23,260 | ) |  | $ | (396,688 | )
Other Comprehensive Income (Loss) Before Reclassifications |  |  | 8,380 |  |  |  | — |  |  |  | — |  |  |  | 8,380 |
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  |  | — |  |  |  | 4,558 |  |  |  | 169 |  |  |  | 4,727 |
Total Other Comprehensive Income (Loss) |  |  | 8,380 |  |  |  | 4,558 |  |  |  | 169 |  |  |  | 13,107 |
Balance at End of Period |  | $ | (216,027 | ) |  | $ | (144,463 | ) |  | $ | (23,091 | ) |  | $ | (383,581 | )
Three Months Ended March 31, 2023 |  |  |  |  |  |  |  |  |  |  |  |
Balance at Beginning of Period |  | $ | (240,783 | ) |  | $ | (168,797 | ) |  | $ | (25,078 | ) |  | $ | (434,658 | )
Other Comprehensive Income (Loss) Before Reclassifications |  |  | 24,195 |  |  |  | — |  |  |  | — |  |  |  | 24,195 |
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  |  | — |  |  |  | 5,081 |  |  |  | 84 |  |  |  | 5,165 |
Total Other Comprehensive Income (Loss) |  |  | 24,195 |  |  |  | 5,081 |  |  |  | 84 |  |  |  | 29,360 |
Balance at End of Period |  | $ | (216,588 | ) |  | $ | (163,716 | ) |  | $ | (24,994 | ) |  | $ | (405,298 | )
Reclassification out of Accumulated Other Comprehensive Income | The following table presents the amounts reclassified out of each component of accumulated other comprehensive income (loss) for the three months ended March 31, 2024, and March 31, 2023:
Details about Accumulated Other Comprehensive Income (Loss) Components |  | Amount Reclassified from Accumulated Other Comprehensive Income (Loss)1 |  |  | Affected Line Item in the Statement Where Net Income Is Presented
|  | Three Months Ended March 31, |  |  |
(dollars in thousands) |  | 2024 |  |  | 2023 |  |  |
Amortization of Unrealized Holding Gains (Losses) on Investment Securities Held-to-Maturity |  | $ | (6,202 | ) |  | $ | (6,913 | ) |  | Interest Income
|  |  | 1,644 |  |  |  | 1,832 |  |  | Provision for Income Tax
|  |  | (4,558 | ) |  |  | (5,081 | ) |  | Net of Tax
Amortization of Defined Benefit Plan Items |  |  |  |  |  |  |  |
Prior Service Credit 2 |  |  | 61 |  |  |  | 61 |  |  |
Net Actuarial Losses 2 |  |  | (291 | ) |  |  | (175 | ) |  |
|  |  | (230 | ) |  |  | (114 | ) |  | Total Before Tax
|  |  | 61 |  |  |  | 30 |  |  | Provision for Income Tax
|  |  | (169 | ) |  |  | (84 | ) |  | Net of Tax
Total Reclassifications for the Period |  | $ | (4,727 | ) |  | $ | (5,165 | ) |  | Net of Tax
1 Amounts in parentheses indicate reductions to net income. 2 These accumulated other comprehensive income (loss) components are included in the computation of net periodic benefit cost and are included in other noninterest expense on the 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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