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Accumulated Other Comprehensive Income (Loss) (Tables) | 3 Months Ended
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Mar. 31, 2022
Comprehensive Income Net Of Tax [Abstract] |
Components of Other Comprehensive Income | The following table presents the components of other comprehensive income (loss) for the three months ended March 31, 2022, and March 31, 2021:
(dollars in thousands) |  | Before Tax |  |  | Tax Effect |  |  | Net of Tax |
Three Months Ended March 31, 2022 |  |  |  |  |  |  |  |  |  |  |  |
Net Unrealized Gains (Losses) on Investment Securities: |  |  |  |  |  |  |  |  |  |  |  |
Net Unrealized Gains (Losses) Arising During the Period |  | $ | (245,147 | ) |  | $ | (64,974 | ) |  | $ | (180,173 | )
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 |  |  | 67 |  |  |  | 18 |  |  |  | 49 |
Net Unrealized Gains (Losses) on Investment Securities |  |  | (245,080 | ) |  |  | (64,956 | ) |  |  | (180,124 | )
Defined Benefit Plans: |  |  |  |  |  |  |  |  |  |  |  |
Amortization of Net Actuarial Losses (Gains) |  |  | 542 |  |  |  | 143 |  |  |  | 399 |
Amortization of Prior Service Credit |  |  | (62 | ) |  |  | (16 | ) |  |  | (46 | )
Defined Benefit Plans, Net |  |  | 480 |  |  |  | 127 |  |  |  | 353 |
Other Comprehensive Income (Loss) |  | $ | (244,600 | ) |  | $ | (64,829 | ) |  | $ | (179,771 | )
Three Months Ended March 31, 2021 |  |  |  |  |  |  |  |  |  |  |  |
Net Unrealized Gains (Losses) on Investment Securities: |  |  |  |  |  |  |  |  |  |  |  |
Net Unrealized Gains (Losses) Arising During the Period |  | $ | (68,225 | ) |  | $ | (18,082 | ) |  | $ | (50,143 | )
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 |  |  | 125 |  |  |  | 32 |  |  |  | 93 |
Net Unrealized Gains (Losses) on Investment Securities |  |  | (68,100 | ) |  |  | (18,050 | ) |  |  | (50,050 | )
Defined Benefit Plans: |  |  |  |  |  |  |  |  |  |  |  |
Amortization of Net Actuarial Losses (Gains) |  |  | 662 |  |  |  | 177 |  |  |  | 485 |
Amortization of Prior Service Credit |  |  | (61 | ) |  |  | (17 | ) |  |  | (44 | )
Defined Benefit Plans, Net |  |  | 601 |  |  |  | 160 |  |  |  | 441 |
Other Comprehensive Income (Loss) |  | $ | (67,499 | ) |  | $ | (17,890 | ) |  | $ | (49,609 | )
1 | The amount relates 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, 2022, and March 31, 2021:
(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, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at Beginning of Period |  | $ | (32,940 | ) |  | $ | 54 |  |  | $ | (33,496 | ) |  | $ | (66,382 | )
Other Comprehensive Income (Loss) Before Reclassifications |  |  | (180,173 | ) |  |  | — |  |  |  | — |  |  |  | (180,173 | )
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  |  | — |  |  |  | 49 |  |  |  | 353 |  |  |  | 402 |
Total Other Comprehensive Income (Loss) |  |  | (180,173 | ) |  |  | 49 |  |  |  | 353 |  |  |  | (179,771 | )
Balance at End of Period |  | $ | (213,113 | ) |  | $ | 103 |  |  | $ | (33,143 | ) |  | $ | (246,153 | )
Three Months Ended March 31, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at Beginning of Period |  | $ | 51,495 |  |  | $ | (423 | ) |  | $ | (43,250 | ) |  | $ | 7,822 |
Other Comprehensive Income (Loss) Before Reclassifications |  |  | (50,143 | ) |  |  | — |  |  |  | — |  |  |  | (50,143 | )
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  |  | — |  |  |  | 93 |  |  |  | 441 |  |  |  | 534 |
Total Other Comprehensive Income (Loss) |  |  | (50,143 | ) |  |  | 93 |  |  |  | 441 |  |  |  | (49,609 | )
Balance at End of Period |  | $ | 1,352 |  |  | $ | (330 | ) |  | $ | (42,809 | ) |  | $ | (41,787 | )
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, 2022, and March 31, 2021:
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) |  | 2022 |  |  | 2021 |  |  |
Amortization of Unrealized Holding Gains (Losses) on Investment Securities Held-to-Maturity |  | $ | (67 | ) |  | $ | (125 | ) |  | Interest Income
|  |  | 18 |  |  |  | 32 |  |  | Provision for Income Tax
|  |  | (49 | ) |  |  | (93 | ) |  | Net of Tax
Amortization of Defined Benefit Plan Items |  |  |  |  |  |  |  |  |  |
Prior Service Credit 2 |  |  | 62 |  |  |  | 61 |  |  |
Net Actuarial Losses 2 |  |  | (542 | ) |  |  | (662 | ) |  |
|  |  | (480 | ) |  |  | (601 | ) |  | Total Before Tax
|  |  | 127 |  |  |  | 160 |  |  | Provision for Income Tax
|  |  | (353 | ) |  |  | (441 | ) |  | Net of Tax
Total Reclassifications for the Period |  | $ | (402 | ) |  | $ | (534 | ) |  | 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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