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Other Comprehensive Income (Loss) - Changes in the Components of Other Comprehensive Income (Loss), Net of Tax (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |
Total other comprehensive income (loss), pre-tax | $ (81,360) |  |  | $ (11,476) |  |  | $ (275,800) | $ (19,282)
Total other comprehensive income (loss), tax expense (benefit) | (20,706) |  |  | (2,920) |  |  | (70,191) | (4,908)
Other comprehensive loss, net of tax | (60,654) | $ (50,829) | $ (94,126) | (8,556) | $ (889) | $ (4,929) | (205,609) | (14,374)
Securities available for sale: |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |
Other comprehensive income (loss), before reclassifications, pre-tax | (85,283) |  |  | (12,408) |  |  | (296,444) | (27,487)
Other comprehensive income (loss) before reclassifications, tax expense (benefit) | (21,704) |  |  | (3,158) |  |  | (75,445) | (6,996)
Other comprehensive income (loss), before reclassifications, net of tax | (63,579) |  |  | (9,250) |  |  | (220,999) | (20,491)
Reclassification from AOCI, pre-tax |  |  |  | (764) |  |  |  | (2,121)
Reclassification from AOCI, tax expense (benefit) |  |  |  | (194) |  |  |  | (539)
Reclassification from AOCI, net of tax |  |  |  | (570) |  |  |  | (1,582)
Total other comprehensive income (loss), pre-tax | (83,664) |  |  | (13,172) |  |  | (295,144) | (29,608)
Total other comprehensive income (loss), tax expense (benefit) | (21,292) |  |  | (3,352) |  |  | (75,114) | (7,535)
Other comprehensive loss, net of tax | (62,372) |  |  | (9,820) |  |  | (220,030) | (22,073)
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 | (1,619) |  |  |  |  |  | (1,300) |
Reclassification from AOCI, tax expense (benefit) | (412) |  |  |  |  |  | (331) |
Reclassification from AOCI, net of tax | (1,207) |  |  |  |  |  | (969) |
Derivative instruments: |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |
Other comprehensive income (loss), before reclassifications, pre-tax | 2,262 |  |  | 1,629 |  |  | 19,219 | 10,129
Other comprehensive income (loss) before reclassifications, tax expense (benefit) | 575 |  |  | 414 |  |  | 4,891 | 2,578
Other comprehensive income (loss), before reclassifications, net of tax | 1,687 |  |  | 1,215 |  |  | 14,328 | 7,551
Total other comprehensive income (loss), pre-tax | 2,262 |  |  | 1,629 |  |  | 19,219 | 10,129
Total other comprehensive income (loss), tax expense (benefit) | 575 |  |  | 414 |  |  | 4,891 | 2,578
Other comprehensive loss, net of tax | 1,687 |  |  | 1,215 |  |  | 14,328 | 7,551
Amortization of net actuarial loss recognized in net periodic pension cost |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |
Reclassification from AOCI, pre-tax | 42 |  |  | 67 |  |  | 125 | 197
Reclassification from AOCI, tax expense (benefit) | 11 |  |  | 18 |  |  | 32 | 49
Reclassification from AOCI, net of tax | 31 |  |  | 49 |  |  | 93 | 148
Total defined benefit pension and post-retirement benefit plans |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |  |  |
Total other comprehensive income (loss), pre-tax | 42 |  |  | 67 |  |  | 125 | 197
Total other comprehensive income (loss), tax expense (benefit) | 11 |  |  | 18 |  |  | 32 | 49
Other comprehensive loss, net of tax | $ 31 |  |  | $ 49 |  |  | $ 93 | $ 148

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