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Reconciliation of changes in the components of OCI (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Equity [Abstract] |  |  |  |
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax |  | $ (19,705) | $ 3,633 | $ 13,435
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, Tax |  | (6,281) | 19,873 | 7,490
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax |  | 16,055 | (50,767) | (19,139)
Other Comprehensive Income (Loss), before Tax [Abstract] |  |  |  |
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, before Tax |  | 22,336 | (70,640) | (26,629)
Change in fair value of securities available for sale, pre tax amount |  | (42,019) | 155,037 | 29,995
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax |  | 210 | 5,603 | 3,414
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax |  | (536) | 635 | 1,331
Amortization of certain costs included in net periodic retirement costs, pre tax amount |  | (39) | (39) | (192)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax | [1] | (312) | 6,246 | 4,937
Total other comprehensive loss, pre tax amount |  | 64,043 | (219,431) | (51,687)
Other Comprehensive Income (Loss), Tax [Abstract] |  |  |  |
Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, Tax |  | (9,593) | 36,047 | 7,073
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, Tax |  | (59) | (1,575) | (960)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, Tax |  | 151 | (179) | (374)
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, Tax |  | (11) | (11) | (54)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax | [1] | 88 | (1,756) | (1,388)
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent |  | (15,786) | 54,164 | 13,175
Other Comprehensive Income (Loss), Net of Tax [Abstract] |  |  |  |
Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, after Tax |  | 32,426 | (118,990) | (22,922)
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Portion Attributable to Parent |  | 32,426 | (118,990) | (22,922)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, after Tax |  | 151 | 4,028 | 2,454
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, after Tax |  | (385) | 456 | 957
Amortization of certain costs included in net periodic retirement costs, after tax amount |  | 28 | 28 | 138
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax | [1] | (224) | 4,490 | 3,549
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent |  | 48,257 | (165,267) | (38,512)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax |  | 0 | 0 | 0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax |  | 0 | 0 | 0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax |  | 0 | 0 | 0
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Tax, Portion Attributable to Parent |  | 42,019 | (155,037) | (29,995)
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, before Tax |  | 42,019 | (155,037) | (29,995)
Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, Tax |  | 9,593 | (36,047) | (7,073)
Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, after Tax |  | 32,426 | (118,990) | (22,922)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax |  | 0 | 0 | 0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax |  | 0 | 0 | 0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax |  | 0 | 0 | 0
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Tax, Portion Attributable to Parent |  | 42,019 | (155,037) | (29,995)
Other Comprehensive Income (Loss), Available-for-Sale Securities, Tax, Portion Attributable to Parent, Total |  | 9,593 | (36,047) | (7,073)
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax, Portion Attributable to Parent |  | 32,426 | (118,990) | (22,922)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax |  | (5,078) | (65,586) | (7,938)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, Tax |  | 1,428 | 18,452 | 2,234
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, after Tax |  | (3,650) | (47,134) | (5,704)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax |  | (27,414) | 5,054 | 18,691
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, Tax |  | 7,709 | (1,421) | (5,256)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax |  | (19,705) | 3,633 | 13,435
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, before Tax |  | 22,336 | (70,640) | (26,629)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, Tax |  | 6,281 | (19,873) | (7,490)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax |  | 16,055 | (50,767) | (19,139)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax |  | 210 | 5,603 | 3,414
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, Tax |  | 59 | 1,575 | 960
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, after Tax |  | 151 | 4,028 | 2,454
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax |  | 536 | (635) | (1,331)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, Tax |  | 151 | (179) | (374)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, after Tax |  | 385 | (456) | (957)
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax |  | 39 | 39 | 192
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, Tax |  | 11 | 11 | 54
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, after Tax |  | 28 | 28 | 138
Other Comprehensive Income (Loss), Defined Benefit Plan, Settlement and Curtailment Gain (Loss), before Tax |  | (25) | (31) |
Other Comprehensive Income (Loss), Defined Benefit Plan, Adjustment for Settlement or Curtailment Gain (Loss), Tax |  | 7 | 9 |
Other Comprehensive Income (Loss), Defined Benefit Plan, Settlement and Curtailment Gain (Loss), after Tax |  | (18) | (22) |
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax | [1] | 312 | (6,246) | (4,937)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax | [1] | 88 | (1,756) | (1,388)
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, after Tax | [1] | 224 | (4,490) | (3,549)
Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent |  | 64,043 | (219,431) | (51,687)
Other Comprehensive Income (Loss), Tax, Portion Attributable to Parent |  | 15,786 | (54,164) | (13,175)
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent |  | $ 48,257 | $ (165,267) | $ (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.

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