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Other Comprehensive Income (Loss) - Changes in Components of OCI (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Total other comprehensive income (loss), pre-tax | $ (264,687) | $ (47,635) | $ 32,600
Total other comprehensive income (loss), tax expense (benefit) | (66,093) | (12,124) | 8,296
Other comprehensive (loss) income, net of tax | (198,594) | (35,511) | 24,304
Securities available for sale: |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other comprehensive income gain (loss), before reclassifications, pre-tax | (285,829) | (51,470) | 27,788
Other comprehensive income gain (loss) before reclassifications, tax expense (benefit) | (71,478) | (13,099) | 7,071
Other comprehensive income gain (loss), before reclassifications, net of tax | (214,351) | (38,371) | 20,717
Reclassification from AOCI, pre-tax |  | (2,170) | (46)
Reclassification from AOCI, tax expense (benefit) |  | (552) | (12)
Reclassification from AOCI, net of tax |  | (1,618) | (34)
Total other comprehensive income (loss), pre-tax | (280,865) | (53,713) | 27,742
Total other comprehensive income (loss), tax expense (benefit) | (70,215) | (13,670) | 7,059
Other comprehensive (loss) income, net of tax | (210,650) | (40,043) | 20,683
Amortization of unrealized holding gains (losses) on securities transferred to the held to maturity category |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Reclassification from AOCI, pre-tax | 4,964 | (73) |
Reclassification from AOCI, tax expense (benefit) | 1,263 | (19) |
Reclassification from AOCI, net of tax | 3,701 | (54) |
Derivative instruments: |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other comprehensive income gain (loss), before reclassifications, pre-tax | 20,118 | 10,848 | 923
Other comprehensive income gain (loss) before reclassifications, tax expense (benefit) | 5,125 | 2,761 | 235
Other comprehensive income gain (loss), before reclassifications, net of tax | 14,993 | 8,087 | 688
Reclassification from AOCI, pre-tax |  | (4,676) | 2,040
Reclassification from AOCI, tax expense (benefit) |  | (1,190) | 519
Reclassification from AOCI, net of tax |  | (3,486) | 1,521
Total other comprehensive income (loss), pre-tax | 20,118 | 6,172 | 2,963
Total other comprehensive income (loss), tax expense (benefit) | 5,125 | 1,571 | 754
Other comprehensive (loss) income, net of tax | 14,993 | 4,601 | 2,209
Net gain (loss) arising during the period |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Other comprehensive income gain (loss), before reclassifications, pre-tax | (4,107) | (356) | 1,069
Other comprehensive income gain (loss) before reclassifications, tax expense (benefit) | (1,045) | (92) | 272
Other comprehensive income gain (loss), before reclassifications, net of tax | (3,062) | (264) | 797
Reclassification adjustment for settlement loss related to the VERP realized in net income |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Reclassification from AOCI, pre-tax |  |  | 567
Reclassification from AOCI, tax expense (benefit) |  |  | 145
Reclassification from AOCI, net of tax |  |  | 422
New prior service cost |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Reclassification from AOCI, pre-tax |  |  | (485)
Reclassification from AOCI, tax expense (benefit) |  |  | (123)
Reclassification from AOCI, net of tax |  |  | (362)
Amortization of net actuarial loss recognized in net periodic pension cost |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Reclassification from AOCI, pre-tax | 167 | 262 | 259
Reclassification from AOCI, tax expense (benefit) | 42 | 67 | 66
Reclassification from AOCI, net of tax | 125 | 195 | 193
Amortization of prior service cost |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Reclassification from AOCI, pre-tax |  |  | 485
Reclassification from AOCI, tax expense (benefit) |  |  | 123
Reclassification from AOCI, net of tax |  |  | 362
Total defined benefit pension and post-retirement benefit plans |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Total other comprehensive income (loss), pre-tax | (3,940) | (94) | 1,895
Total other comprehensive income (loss), tax expense (benefit) | (1,003) | (25) | 483
Other comprehensive (loss) income, net of tax | $ (2,937) | $ (69) | $ 1,412

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