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OTHER COMPREHENSIVE LOSS (Tables) | 12 Months Ended
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Dec. 31, 2023
Equity [Abstract] |
Schedule of Other Comprehensive Loss | The following tables present a reconciliation of the changes in the components of other comprehensive income (loss) for the periods indicated, including the amount of income tax (expense) benefit allocated to each component of other comprehensive income (loss):
| Year Ended December 31, 2023
| Pre-Tax Amount |  | Tax (Expense) Benefit |  | After Tax Amount
| (Dollars in thousands)
Change in fair value of securities available for sale | $ | 42,019 |  |  | $ | (9,593) |  |  | $ | 32,426 |
Less: net security losses reclassified into other noninterest expense | — |  |  | — |  |  | — |
Net change in fair value of securities available for sale | 42,019 |  |  | (9,593) |  |  | 32,426 |
Change in fair value of cash flow hedges | (5,078) |  |  | 1,428 |  |  | (3,650) |
Less: net cash flow hedge losses reclassified into interest income or interest expense | (27,414) |  |  | 7,709 |  |  | (19,705) |
Net change in fair value of cash flow hedges | 22,336 |  |  | (6,281) |  |  | 16,055 |
Net unamortized gain related to defined benefit pension and other postretirement adjustments arising during the period | 210 |  |  | (59) |  |  | 151 |
Amortization of net actuarial gains | (536) |  |  | 151 |  |  | (385) |
Amortization of net prior service costs | 39 |  |  | (11) |  |  | 28 |
Amortization of net settlement credits | (25) |  |  | 7 |  |  | (18) |
Net change in other comprehensive income for defined benefit postretirement plans (1) | (312) |  |  | 88 |  |  | (224) |
Total other comprehensive income | $ | 64,043 |  |  | $ | (15,786) |  |  | $ | 48,257 |
| Year Ended December 31, 2022
| Pre-Tax Amount |  | Tax (Expense) Benefit |  | After Tax Amount
| (Dollars in thousands)
Change in fair value of securities available for sale | $ | (155,037) |  |  | $ | 36,047 |  |  | $ | (118,990) |
Less: net security losses reclassified into other noninterest expense | — |  |  | — |  |  | — |
Net change in fair value of securities available for sale | (155,037) |  |  | 36,047 |  |  | (118,990) |
Change in fair value of cash flow hedges | (65,586) |  |  | 18,452 |  |  | (47,134) |
Less: net cash flow hedge gains reclassified into interest income or interest expense | 5,054 |  |  | (1,421) |  |  | 3,633 |
Net change in fair value of cash flow hedges | (70,640) |  |  | 19,873 |  |  | (50,767) |
Net unamortized gain related to defined benefit pension and other postretirement adjustments arising during the period | 5,603 |  |  | (1,575) |  |  | 4,028 |
Amortization of net actuarial losses | 635 |  |  | (179) |  |  | 456 |
Amortization of net prior service costs | 39 |  |  | (11) |  |  | 28 |
Amortization of net settlement credits | (31) |  |  | 9 |  |  | (22) |
Net change in other comprehensive income for defined benefit postretirement plans (1) | 6,246 |  |  | (1,756) |  |  | 4,490 |
Total other comprehensive loss | $ | (219,431) |  |  | $ | 54,164 |  |  | $ | (165,267) |
| Year Ended December 31, 2021
| Pre-Tax Amount |  | Tax (Expense) Benefit |  | After Tax Amount
| (Dollars in thousands)
Change in fair value of securities available for sale | $ | (29,995) |  |  | $ | 7,073 |  |  | $ | (22,922) |
Less: net security losses reclassified into other noninterest expense | — |  |  | — |  |  | — |
Net change in fair value of securities available for sale | (29,995) |  |  | 7,073 |  |  | (22,922) |
Change in fair value of cash flow hedges | (7,938) |  |  | 2,234 |  |  | (5,704) |
Less: net cash flow hedge gains reclassified into interest income or interest expense | 18,691 |  |  | (5,256) |  |  | 13,435 |
Net change in fair value of cash flow hedges | (26,629) |  |  | 7,490 |  |  | (19,139) |
Net unamortized gain related to defined benefit pension and other postretirement adjustments arising during the period | 3,414 |  |  | (960) |  |  | 2,454 |
Amortization of net actuarial losses | 1,331 |  |  | (374) |  |  | 957 |
Amortization of net prior service costs | 192 |  |  | (54) |  |  | 138 |
Net change in other comprehensive income for defined benefit postretirement plans (1) | 4,937 |  |  | (1,388) |  |  | 3,549 |
Total other comprehensive loss | $ | (51,687) |  |  | $ | 13,175 |  |  | $ | (38,512) |
(1)The amortization of prior service costs is included in the computation of net periodic pension costs as disclosed in Note 12 - Employee Benefit Plans within the Notes to the Consolidated Financial Statements in Item 8.
Schedule of Accumulated Other Comprehensive Income (Loss), Net of Tax | Information on the Company's accumulated other comprehensive income (loss), net of tax, is comprised of the following components as of the dates indicated:
| Unrealized Gain (Loss) on Securities |  | Unrealized Gain (Loss) on Cash Flow Hedge |  |  |  | Defined Benefit Postretirement Plans |  | Accumulated Other Comprehensive Income (Loss)
| (Dollars in Thousands)
Beginning balance: January 1, 2021 | $ | 13,255 |  |  | $ | 33,276 |  |  |  |  | $ | (5,836) |  |  | $ | 40,695 |
Other comprehensive income (loss) | (22,922) |  |  | (19,139) |  |  |  |  | 3,549 |  |  | (38,512) |
Ending balance: December 31, 2021 | $ | (9,667) |  |  | $ | 14,137 |  |  |  |  | $ | (2,287) |  |  | $ | 2,183 |
Other comprehensive income (loss) | (118,990) |  |  | (50,767) |  |  |  |  | 4,490 |  |  | (165,267) |
Ending balance: December 31, 2022 | $ | (128,657) |  |  | $ | (36,630) |  |  |  |  | $ | 2,203 |  |  | $ | (163,084) |
Other comprehensive income (loss) | 32,426 |  |  | 16,055 |  |  |  |  | (224) |  |  | 48,257 |
Ending balance: December 31, 2023 | $ | (96,231) |  |  | $ | (20,575) |  |  |  |  | $ | 1,979 |  |  | $ | (114,827) |

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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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