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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 | 6 Months Ended
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Jun. 30, 2022 | Mar. 31, 2022 | Jun. 30, 2021 | Mar. 31, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Total other comprehensive income (loss), pre-tax | $ (68,183) |  | $ (1,193) |  | $ (194,440) | $ (7,806)
Total other comprehensive income (loss), tax expense (benefit) | (17,354) |  | (304) |  | (49,485) | (1,988)
Other comprehensive loss, net of tax | (50,829) | $ (94,126) | (889) | $ (4,929) | (144,955) | (5,818)
Securities available for sale: |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Other comprehensive income (loss), before reclassifications, pre-tax | (76,405) |  | 4,965 |  | (211,161) | (15,079)
Other comprehensive income (loss) before reclassifications, tax expense (benefit) | (19,447) |  | 1,263 |  | (53,741) | (3,838)
Other comprehensive income (loss), before reclassifications, net of tax | (56,958) |  | 3,702 |  | (157,420) | (11,241)
Reclassification from AOCI, pre-tax |  |  |  |  |  | (1,357)
Reclassification from AOCI, tax expense (benefit) |  |  |  |  |  | (345)
Reclassification from AOCI, net of tax |  |  |  |  |  | (1,012)
Total other comprehensive income (loss), pre-tax | (76,625) |  | 4,965 |  | (211,480) | (16,436)
Total other comprehensive income (loss), tax expense (benefit) | (19,503) |  | 1,263 |  | (53,822) | (4,183)
Other comprehensive loss, net of tax | (57,122) |  | 3,702 |  | (157,658) | (12,253)
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 | 220 |  |  |  | 319 |
Reclassification from AOCI, tax expense (benefit) | 56 |  |  |  | 81 |
Reclassification from AOCI, net of tax | 164 |  |  |  | 238 |
Derivative instruments: |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Other comprehensive income (loss), before reclassifications, pre-tax | 8,401 |  | (6,234) |  | 16,957 | 8,500
Other comprehensive income (loss) before reclassifications, tax expense (benefit) | 2,139 |  | (1,586) |  | 4,316 | 2,164
Other comprehensive income (loss), before reclassifications, net of tax | 6,262 |  | (4,648) |  | 12,641 | 6,336
Total other comprehensive income (loss), pre-tax | 8,401 |  | (6,234) |  | 16,957 | 8,500
Total other comprehensive income (loss), tax expense (benefit) | 2,139 |  | (1,586) |  | 4,316 | 2,164
Other comprehensive loss, net of tax | 6,262 |  | (4,648) |  | 12,641 | 6,336
Amortization of net actuarial loss recognized in net periodic pension cost |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Reclassification from AOCI, pre-tax | 41 |  | 76 |  | 83 | 130
Reclassification from AOCI, tax expense (benefit) | 10 |  | 19 |  | 21 | 31
Reclassification from AOCI, net of tax | 31 |  | 57 |  | 62 | 99
Total defined benefit pension and post-retirement benefit plans |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |  |
Total other comprehensive income (loss), pre-tax | 41 |  | 76 |  | 83 | 130
Total other comprehensive income (loss), tax expense (benefit) | 10 |  | 19 |  | 21 | 31
Other comprehensive loss, net of tax | $ 31 |  | $ 57 |  | $ 62 | $ 99

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