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Other Comprehensive Income (Loss) (Tables) | 6 Months Ended
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Jun. 30, 2023
Equity [Abstract] |
Changes in the components of other comprehensive income (loss) | Changes in the components of other comprehensive income (loss), net of tax, were as follows for the periods presented:
| Pre-Tax |  | Tax Expense (Benefit) |  | Net of Tax
Three months ended June 30, 2023 |  |  |  |  |
Securities available for sale: |  |  |  |  |
Unrealized holding losses on securities | $ | (21,283) |  |  | $ | (5,353) |  |  | $ | (15,930) |
Reclassification adjustment for losses realized in net income | 22,438 |  |  | 5,622 |  |  | 16,816 |
Amortization of unrealized holding losses on securities transferred to the held to maturity category | 3,026 |  |  | 774 |  |  | 2,252 |
Total securities available for sale | 4,181 |  |  | 1,043 |  |  | 3,138 |
Derivative instruments: |  |  |  |  |
Unrealized holding losses on derivative instruments | (3,167) |  |  | (806) |  |  | (2,361) |
Total derivative instruments | (3,167) |  |  | (806) |  |  | (2,361) |
Defined benefit pension and post-retirement benefit plans: |  |  |  |  |
Amortization of net actuarial loss recognized in net periodic pension cost | 115 |  |  | 29 |  |  | 86 |
Total defined benefit pension and post-retirement benefit plans | 115 |  |  | 29 |  |  | 86 |
Total other comprehensive income | $ | 1,129 |  |  | $ | 266 |  |  | $ | 863 |
Three months ended June 30, 2022 |  |  |  |  |
Securities available for sale: |  |  |  |  |
Unrealized holding losses on securities | $ | (76,405) |  |  | $ | (19,447) |  |  | $ | (56,958) |
Amortization of unrealized holding gains on securities transferred to the held to maturity category | (220) |  |  | (56) |  |  | (164) |
Total securities available for sale | (76,625) |  |  | (19,503) |  |  | (57,122) |
Derivative instruments: |  |  |  |  |
Unrealized holding gains on derivative instruments | 8,401 |  |  | 2,139 |  |  | 6,262 |
Total derivative instruments | 8,401 |  |  | 2,139 |  |  | 6,262 |
Defined benefit pension and post-retirement benefit plans: |  |  |  |  |
Amortization of net actuarial loss recognized in net periodic pension cost | 41 |  |  | 10 |  |  | 31 |
Total defined benefit pension and post-retirement benefit plans | 41 |  |  | 10 |  |  | 31 |
Total other comprehensive loss | $ | (68,183) |  |  | $ | (17,354) |  |  | $ | (50,829) |
| Pre-Tax |  | Tax Expense (Benefit) |  | Net of Tax
Six months ended June 30, 2023 |  |  |  |  |
Securities available for sale: |  |  |  |  |
Unrealized holding losses on securities | $ | (569) |  |  | $ | (170) |  |  | $ | (399) |
Reclassification adjustment for losses realized in net income | 22,438 |  |  | 5,622 |  |  | 16,816 |
Amortization of unrealized holding losses on securities transferred to the held to maturity category | 6,154 |  |  | 1,574 |  |  | 4,580 |
Total securities available for sale | 28,023 |  |  | 7,026 |  |  | 20,997 |
Derivative instruments: |  |  |  |  |
Unrealized holding losses on derivative instruments | (4,823) |  |  | (1,230) |  |  | (3,593) |
Total derivative instruments | (4,823) |  |  | (1,230) |  |  | (3,593) |
Defined benefit pension and post-retirement benefit plans: |  |  |  |  |
Amortization of net actuarial loss recognized in net periodic pension cost | 231 |  |  | 59 |  |  | 172 |
Total defined benefit pension and post-retirement benefit plans | 231 |  |  | 59 |  |  | 172 |
Total other comprehensive income | $ | 23,431 |  |  | $ | 5,855 |  |  | $ | 17,576 |
Six months ended June 30, 2022 |  |  |  |  |
Securities available for sale: |  |  |  |  |
Unrealized holding losses on securities | $ | (211,161) |  |  | $ | (53,741) |  |  | $ | (157,420) |
Amortization of unrealized holding gains on securities transferred to the held to maturity category | (319) |  |  | (81) |  |  | (238) |
Total securities available for sale | (211,480) |  |  | (53,822) |  |  | (157,658) |
Derivative instruments: |  |  |  |  |
Unrealized holding gains on derivative instruments | 16,957 |  |  | 4,316 |  |  | 12,641 |
Total derivative instruments | 16,957 |  |  | 4,316 |  |  | 12,641 |
Defined benefit pension and post-retirement benefit plans: |  |  |  |  |
Amortization of net actuarial loss recognized in net periodic pension cost | 83 |  |  | 21 |  |  | 62 |
Total defined benefit pension and post-retirement benefit plans | 83 |  |  | 21 |  |  | 62 |
Total other comprehensive loss | $ | (194,440) |  |  | $ | (49,485) |  |  | $ | (144,955) |
Accumulated balances for each component of other comprehensive income (loss), net of tax | The accumulated balances for each component of other comprehensive loss, net of tax, were as follows as of the dates presented:
| June 30, 2023 |  | December 31, 2022
Unrealized losses on securities | $ | (198,769) |  |  | $ | (219,766) |
Unrealized gains on derivative instruments | 15,363 |  |  | 18,956 |
Unrecognized losses on defined benefit pension and post-retirement benefit plans obligations | (8,055) |  |  | (8,227) |
Total accumulated other comprehensive loss | $ | (191,461) |  |  | $ | (209,037) |

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