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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, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Total other comprehensive income (loss), pre-tax | $ 15,660 | $ 73,229 | $ (264,687)
Total other comprehensive income (loss), tax expense (benefit) | 4,012 | 18,448 | (66,093)
Other comprehensive income (loss), net of tax | 11,648 | 54,781 | (198,594)
Securities available for sale: |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other comprehensive income gain (loss), before reclassifications, pre-tax | 1,455 | 20,194 | (285,829)
Other comprehensive income gain (loss) before reclassifications, tax expense (benefit) | 381 | 5,066 | (71,478)
Other comprehensive income gain (loss), before reclassifications, net of tax | 1,074 | 15,128 | (214,351)
Reclassification from AOCI, pre-tax |  | 41,494 |
Reclassification from AOCI, tax expense (benefit) |  | 10,431 |
Reclassification from AOCI, net of tax |  | 31,063 |
Amortization of unrealized holding losses on securities transferred to held to maturity category, pre tax | 12,731 | 13,557 |
Amortization of unrealized holding losses on securities transferred to held to maturity category, tax expense (benefit) | 3,255 | 3,466 |
Amortization of unrealized holding losses on securities transferred to held to maturity category, net of tax | 9,476 | 10,091 |
Total other comprehensive income (loss), pre-tax | 14,186 | 75,245 | (280,865)
Total other comprehensive income (loss), tax expense (benefit) | 3,636 | 18,963 | (70,215)
Other comprehensive income (loss), net of tax | 10,550 | 56,282 | (210,650)
Amortization of unrealized holding losses on securities transferred to the held to maturity category |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Reclassification from AOCI, pre-tax |  |  | 4,964
Reclassification from AOCI, tax expense (benefit) |  |  | 1,263
Reclassification from AOCI, net of tax |  |  | 3,701
Derivative instruments: |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other comprehensive income gain (loss), before reclassifications, pre-tax | 508 | (2,558) | 20,118
Other comprehensive income gain (loss) before reclassifications, tax expense (benefit) | 130 | (653) | 5,125
Other comprehensive income gain (loss), before reclassifications, net of tax | 378 | (1,905) | 14,993
Total other comprehensive income (loss), pre-tax | 508 | (2,558) | 20,118
Total other comprehensive income (loss), tax expense (benefit) | 130 | (653) | 5,125
Other comprehensive income (loss), net of tax | 378 | (1,905) | 14,993
Net gain (loss) arising during the period |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other comprehensive income gain (loss), before reclassifications, pre-tax | 543 | 80 | (4,107)
Other comprehensive income gain (loss) before reclassifications, tax expense (benefit) | 138 | 20 | (1,045)
Other comprehensive income gain (loss), before reclassifications, net of tax | 405 | 60 | (3,062)
Amortization of net actuarial loss recognized in net periodic pension cost |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Reclassification from AOCI, pre-tax | 423 | 462 | 167
Reclassification from AOCI, tax expense (benefit) | 108 | 118 | 42
Reclassification from AOCI, net of tax | 315 | 344 | 125
Total defined benefit pension and post-retirement benefit plans |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Total other comprehensive income (loss), pre-tax | 966 | 542 | (3,940)
Total other comprehensive income (loss), tax expense (benefit) | 246 | 138 | (1,003)
Other comprehensive income (loss), net of tax | $ 720 | $ 404 | $ (2,937)

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