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Other Comprehensive Income (Loss) - Changes in Components of OCI (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Total other comprehensive income (loss), pre-tax | $ 73,229 | $ (264,687) | $ (47,635)
Total other comprehensive income (loss), tax expense (benefit) | 18,448 | (66,093) | (12,124)
Other comprehensive income (loss), net of tax | 54,781 | (198,594) | (35,511)
Securities available for sale: |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other comprehensive income gain (loss), before reclassifications, pre-tax | 20,194 | (285,829) | (51,470)
Other comprehensive income gain (loss) before reclassifications, tax expense (benefit) | 5,066 | (71,478) | (13,099)
Other comprehensive income gain (loss), before reclassifications, net of tax | 15,128 | (214,351) | (38,371)
Reclassification from AOCI, pre-tax | 41,494 |  | (2,170)
Reclassification from AOCI, tax expense (benefit) | 10,431 |  | (552)
Reclassification from AOCI, net of tax | 31,063 |  | (1,618)
Amortization of unrealized holding losses on securities transferred to held to maturity category, pre tax | 13,557 | 4,964 |
Amortization of unrealized holding losses on securities transferred to held to maturity category, tax expense (benefit) | 3,466 | 1,263 |
Amortization of unrealized holding losses on securities transferred to held to maturity category, net of tax | 10,091 | 3,701 |
Total other comprehensive income (loss), pre-tax | 75,245 | (280,865) | (53,713)
Total other comprehensive income (loss), tax expense (benefit) | 18,963 | (70,215) | (13,670)
Other comprehensive income (loss), net of tax | 56,282 | (210,650) | (40,043)
Amortization of unrealized holding gains on securities transferred to the held to maturity category |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Reclassification from AOCI, pre-tax |  |  | (73)
Reclassification from AOCI, tax expense (benefit) |  |  | (19)
Reclassification from AOCI, net of tax |  |  | (54)
Derivative instruments: |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other comprehensive income gain (loss), before reclassifications, pre-tax | (2,558) | 20,118 | 10,848
Other comprehensive income gain (loss) before reclassifications, tax expense (benefit) | (653) | 5,125 | 2,761
Other comprehensive income gain (loss), before reclassifications, net of tax | (1,905) | 14,993 | 8,087
Reclassification from AOCI, pre-tax |  |  | (4,676)
Reclassification from AOCI, tax expense (benefit) |  |  | (1,190)
Reclassification from AOCI, net of tax |  |  | (3,486)
Total other comprehensive income (loss), pre-tax | (2,558) | 20,118 | 6,172
Total other comprehensive income (loss), tax expense (benefit) | (653) | 5,125 | 1,571
Other comprehensive income (loss), net of tax | (1,905) | 14,993 | 4,601
Net gain (loss) arising during the period |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other comprehensive income gain (loss), before reclassifications, pre-tax | 80 | (4,107) | (356)
Other comprehensive income gain (loss) before reclassifications, tax expense (benefit) | 20 | (1,045) | (92)
Other comprehensive income gain (loss), before reclassifications, net of tax | 60 | (3,062) | (264)
Amortization of net actuarial loss recognized in net periodic pension cost |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Reclassification from AOCI, pre-tax | 462 | 167 | 262
Reclassification from AOCI, tax expense (benefit) | 118 | 42 | 67
Reclassification from AOCI, net of tax | 344 | 125 | 195
Total defined benefit pension and post-retirement benefit plans |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Total other comprehensive income (loss), pre-tax | 542 | (3,940) | (94)
Total other comprehensive income (loss), tax expense (benefit) | 138 | (1,003) | (25)
Other comprehensive income (loss), net of tax | $ 404 | $ (2,937) | $ (69)

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