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Shareholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2024
Stockholders' Equity Note [Abstract] |
Schedule of Minimum Required Capital Amounts and Ratios for Well Capitalized Institutions and The Actual Capital Amounts and Ratios for The Company and The Bank | The table below sets forth the minimum required capital amounts and ratios for well capitalized institutions and the actual capital amounts and ratios for the Company and the Bank as of December 31, 2024 and 2023:
(dollars in thousands) |  | Well Capitalized Minimum Ratio |  |  | Company |  |  | Bank |
As of December 31, 2024 |  |  |  |  |  |  |  |  |
Common Shareholders’ Equity |  |  |  |  | $ | 1,322,774 |  |  | $ | 1,540,431 |
Common Equity Tier 1 Capital |  |  |  |  |  | 1,648,889 |  |  |  | 1,869,247 |
Tier 1 Capital |  |  |  |  |  | 1,984,990 |  |  |  | 1,869,247 |
Total Capital |  |  |  |  |  | 2,133,624 |  |  |  | 2,017,881 |
Common Equity Tier 1 Capital Ratio |  |  | 6.5 | % |  |  | 11.59 | % |  |  | 13.16 | %
Tier 1 Capital Ratio |  |  | 8.0 | % |  |  | 13.95 | % |  |  | 13.16 | %
Total Capital Ratio |  |  | 10.0 | % |  |  | 15.00 | % |  |  | 14.20 | %
Tier 1 Leverage Ratio |  |  | 5.0 | % |  |  | 8.31 | % |  |  | 7.83 | %
As of December 31, 2023 |  |  |  |  |  |  |  |  |
Common Shareholders’ Equity |  |  |  |  | $ | 1,238,756 |  |  | $ | 1,369,733 |
Common Equity Tier 1 Capital |  |  |  |  |  | 1,611,645 |  |  |  | 1,754,222 |
Tier 1 Capital |  |  |  |  |  | 1,787,132 |  |  |  | 1,754,222 |
Total Capital |  |  |  |  |  | 1,935,532 |  |  |  | 1,902,622 |
Common Equity Tier 1 Capital Ratio |  |  | 6.5 | % |  |  | 11.33 | % |  |  | 12.33 | %
Tier 1 Capital Ratio |  |  | 8.0 | % |  |  | 12.56 | % |  |  | 12.33 | %
Total Capital Ratio |  |  | 10.0 | % |  |  | 13.60 | % |  |  | 13.38 | %
Tier 1 Leverage Ratio |  |  | 5.0 | % |  |  | 7.51 | % |  |  | 7.38 | %
Components of Other Comprehensive Income | The following table presents the components of other comprehensive income (loss), net of tax:
(dollars in thousands) |  | Before Tax |  |  | Tax Effect |  |  | Net of Tax |
Year Ended December 31, 2024 |  |  |  |  |  |  |  |  |
Net Unrealized Gains on Investment Securities: |  |  |  |  |  |  |  |  |
Net Unrealized Gains Arising During the Period |  | $ | 47,860 |  |  | $ | 12,683 |  |  | $ | 35,177 |
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) that (Increase) Decrease Net Income: |  |  |  |  |  |  |  |  |
Amortization of Unrealized Holding Losses on Held-to-Maturity Securities |  |  | 24,844 |  |  |  | 6,586 |  |  |  | 18,258 |
Net Unrealized Gains on Investment Securities |  |  | 72,704 |  |  |  | 19,269 |  |  |  | 53,435 |
Defined Benefit Plans: |  |  |  |  |  |  |  |  |
Net Actuarial Losses Arising During the Period |  |  | (1,101 | ) |  |  | (291 | ) |  |  | (810 | )
Amortization of Net Actuarial Losses |  |  | 1,163 |  |  |  | 308 |  |  |  | 855 |
Amortization of Prior Service Credit |  |  | (246 | ) |  |  | (65 | ) |  |  | (181 | )
Defined Benefit Plans, Net |  |  | (184 | ) |  |  | (48 | ) |  |  | (136 | )
Other Comprehensive Income |  | $ | 72,520 |  |  | $ | 19,221 |  |  | $ | 53,299 |
Year Ended December 31, 2023 |  |  |  |  |  |  |  |  |
Net Unrealized Gains on Investment Securities: |  |  |  |  |  |  |  |  |
Net Unrealized Gains Arising During the Period |  | $ | 17,692 |  |  | $ | 4,661 |  |  | $ | 13,031 |
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) that (Increase) Decrease Net Income: |  |  |  |  |  |  |  |  |
Loss on Sale |  |  | 4,582 |  |  |  | 1,237 |  |  |  | 3,345 |
Amortization of Unrealized Holding Losses on Held-to-Maturity Securities |  |  | 26,909 |  |  |  | 7,133 |  |  |  | 19,776 |
Net Unrealized Gains on Investment Securities |  |  | 49,183 |  |  |  | 13,031 |  |  |  | 36,152 |
Defined Benefit Plans: |  |  |  |  |  |  |  |  |
Net Actuarial Gains Arising During the Period |  |  | 1,968 |  |  |  | 521 |  |  |  | 1,447 |
Amortization of Net Actuarial Losses |  |  | 751 |  |  |  | 199 |  |  |  | 552 |
Amortization of Prior Service Credit |  |  | (246 | ) |  |  | (65 | ) |  |  | (181 | )
Defined Benefit Plans, Net |  |  | 2,473 |  |  |  | 655 |  |  |  | 1,818 |
Other Comprehensive Income |  | $ | 51,656 |  |  | $ | 13,686 |  |  | $ | 37,970 |
Year Ended December 31, 2022 |  |  |  |  |  |  |  |  |
Net Unrealized Losses on Investment Securities: |  |  |  |  |  |  |  |  |
Net Unrealized Losses Arising During the Period |  | $ | (523,221 | ) |  | $ | (138,678 | ) |  | $ | (384,543 | )
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) that (Increase) Decrease Net Income: |  |  |  |  |  |  |  |  |
Amortization of Unrealized Holding Losses on Held-to-Maturity Securities |  |  | 10,680 |  |  |  | 2,831 |  |  |  | 7,849 |
Net Unrealized Losses on Investment Securities |  |  | (512,541 | ) |  |  | (135,847 | ) |  |  | (376,694 | )
Defined Benefit Plans: |  |  |  |  |  |  |  |  |
Net Actuarial Gains Arising During the Period |  |  | 9,525 |  |  |  | 2,525 |  |  |  | 7,000 |
Amortization of Net Actuarial Losses |  |  | 2,175 |  |  |  | 576 |  |  |  | 1,599 |
Amortization of Prior Service Credit |  |  | (246 | ) |  |  | (65 | ) |  |  | (181 | )
Defined Benefit Plans, Net |  |  | 11,454 |  |  |  | 3,036 |  |  |  | 8,418 |
Other Comprehensive Loss |  | $ | (501,087 | ) |  | $ | (132,811 | ) |  | $ | (368,276 | )
The amortization of unrealized holding losses on HTM securities amounts relate to the amortization/accretion of unrealized losses related to the Company’s reclassification of AFS investment securities to the HTM category. The unrealized losses will be amortized 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:
(dollars in thousands) |  |  | Investment Securities- Available-For-Sale |  |  | Investment Securities-Held-To-Maturity |  |  | Defined Benefit Plans |  |  | Accumulated Other Comprehensive Income (Loss)
Year Ended December 31, 2024 |  |  |  |  |  |  |  |  |  |  |  |
Balance at Beginning of Period |  | $ | (224,407) |  | $ | (149,021) |  | $ | (23,260) |  | $ | (396,688)
Other Comprehensive Income (Loss) Before Reclassifications |  |  | 35,177 |  |  | — |  |  | (810) |  |  | 34,367
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  |  | — |  |  | 18,258 |  |  | 674 |  |  | 18,932
Total Other Comprehensive Income (Loss) |  |  | 35,177 |  |  | 18,258 |  |  | (136) |  |  | 53,299
Balance at End of Period |  | $ | (189,230) |  | $ | (130,763) |  | $ | (23,396) |  | $ | (343,389)
Year Ended December 31, 2023 |  |  |  |  |  |  |  |  |  |  |  |
Balance at Beginning of Period |  | $ | (240,783) |  | $ | (168,797) |  | $ | (25,078) |  | $ | (434,658)
Other Comprehensive Income (Loss) Before Reclassifications |  |  | 13,031 |  |  | — |  |  | 1,447 |  |  | 14,478
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  |  | 3,345 |  |  | 19,776 |  |  | 371 |  |  | 23,492
Total Other Comprehensive Income (Loss) |  |  | 16,376 |  |  | 19,776 |  |  | 1,818 |  |  | 37,970
Balance at End of Period |  | $ | (224,407) |  | $ | (149,021) |  | $ | (23,260) |  | $ | (396,688)
Year Ended December 31, 2022 |  |  |  |  |  |  |  |  |  |  |  |
Balance at Beginning of Period |  | $ | (32,940) |  | $ | 54 |  | $ | (33,496) |  | $ | (66,382)
Other Comprehensive Income (Loss) Before Reclassifications |  |  | (384,543) |  |  | — |  |  | 7,000 |  |  | (377,543)
Unrealized Net Losses Related to the Transfer of Securities from Available-for-Sale to Held-to-Maturity |  |  | 176,700 |  |  | (176,700) |  |  | — |  |  | —
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  |  | — |  |  | 7,849 |  |  | 1,418 |  |  | 9,267
Total Other Comprehensive Income (Loss) |  |  | (207,843) |  |  | (168,851) |  |  | 8,418 |  |  | (368,276)
Balance at End of Period |  | $ | (240,783) |  | $ | (168,797) |  | $ | (25,078) |  | $ | (434,658)
Reclassification out of Accumulated Other Comprehensive Income | The following table presents the amounts reclassified out of each component of accumulated other comprehensive income (loss):
|  | Amount Reclassified from Accumulated Other |  |  |
|  | Comprehensive Income (Loss) 1 |  |  | Affected Line Item in the
|  | Year Ended December 31, |  |  | Statement Where
(dollars in thousands) |  | 2024 |  |  | 2023 |  |  | 2022 |  |  | Net Income is Presented
Amortization of Unrealized Holding Gains (Losses) on Investment Securities Held-to-Maturity |  | $ | (24,844 | ) |  | $ | (26,909 | ) |  | $ | (10,680 | ) |  | Interest Income
|  |  | 6,586 |  |  |  | 7,133 |  |  |  | 2,831 |  |  | Provision for Income Tax
|  |  | (18,258 | ) |  |  | (19,776 | ) |  |  | (7,849 | ) |  | Net of Tax
Sales of Investment Securities Available-for-Sale |  |  | — |  |  |  | (4,582 | ) |  |  | — |  |  | Investment Securities Gains (Losses), Net
|  |  | — |  |  |  | 1,237 |  |  |  | — |  |  | Provision for Income Tax
|  |  | — |  |  |  | (3,345 | ) |  |  | — |  |  | Net of Tax
Amortization of Defined Benefit Plans Items |  |  |  |  |  |  |  |  |  |  |
Prior Service Credit 2 |  |  | 246 |  |  |  | 246 |  |  |  | 246 |  |  |
Net Actuarial Losses 2 |  |  | (1,163 | ) |  |  | (751 | ) |  |  | (2,175 | ) |  |
|  |  | (917 | ) |  |  | (505 | ) |  |  | (1,929 | ) |  | Total Before Tax
|  |  | 243 |  |  |  | 134 |  |  |  | 511 |  |  | Provision for Income Tax
|  |  | (674 | ) |  |  | (371 | ) |  |  | (1,418 | ) |  | Net of Tax
Total Reclassifications for the Period |  | $ | (18,932 | ) |  | $ | (23,492 | ) |  | $ | (9,267 | ) |  | 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 in the consolidated statements of income.

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