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Other Comprehensive Income - Changes in the Components of Other Comprehensive Income (Loss), Net of Tax (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Sep. 30, 2024
Sep. 30, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Total other comprehensive income (loss), pre-tax $ 33,434     $ (10,430)     $ 33,675 $ 13,001
Total other comprehensive income (loss), tax expense (benefit) 8,412     (2,567)     8,513 3,288
Other comprehensive income (loss), net of tax 25,022 $ 2,827 $ (2,687) (7,863) $ 863 $ 16,713 25,162 9,713
Securities available for sale:                
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Other comprehensive income (loss), before reclassifications, pre-tax 31,313     (17,175)     25,769 (17,744)
Other comprehensive income (loss) before reclassifications, tax expense (benefit) 7,872     (4,292)     6,494 (4,462)
Other comprehensive income (loss), before reclassifications, net of tax 23,441     (12,883)     19,275 (13,282)
Amortization of unrealized holding losses on securities transferred to held to maturity category, pre tax 3,131     3,959     9,658 10,113
Amortization of unrealized holding losses on securities transferred to held to maturity category, tax expense (benefit) 800     1,012     2,468 2,586
Amortization of unrealized holding losses on securities transferred to held to maturity category, net of tax 2,331     2,947     7,190 7,527
Amortization of net actuarial loss recognized in net periodic pension cost, pre-tax               22,438
Amortization of net actuarial loss recognized in net periodic pension cost, tax expense (benefit)               5,622
Amortization of net actuarial loss recognized in net periodic pension cost, net of tax               16,816
Total other comprehensive income (loss), pre-tax 34,444     (13,216)     35,427 14,807
Total other comprehensive income (loss), tax expense (benefit) 8,672     (3,280)     8,962 3,746
Other comprehensive income (loss), net of tax 25,772     (9,936)     26,465 11,061
Derivative instruments:                
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Other comprehensive income (loss), before reclassifications, pre-tax (1,116)     2,670     (2,069) (2,153)
Other comprehensive income (loss) before reclassifications, tax expense (benefit) (288)     683     (530) (547)
Other comprehensive income (loss), before reclassifications, net of tax (828)     1,987     (1,539) (1,606)
Total other comprehensive income (loss), pre-tax (1,116)     2,670     (2,069) (2,153)
Total other comprehensive income (loss), tax expense (benefit) (288)     683     (530) (547)
Other comprehensive income (loss), net of tax (828)     1,987     (1,539) (1,606)
Amortization of net actuarial loss recognized in net periodic pension cost                
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Amortization of net actuarial loss recognized in net periodic pension cost, pre-tax 106     116     317 347
Amortization of net actuarial loss recognized in net periodic pension cost, tax expense (benefit) 28     30     81 89
Amortization of net actuarial loss recognized in net periodic pension cost, net of tax 78     86     236 258
Total defined benefit pension and post-retirement benefit plans                
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Total other comprehensive income (loss), pre-tax 106     116     317 347
Total other comprehensive income (loss), tax expense (benefit) 28     30     81 89
Other comprehensive income (loss), net of tax $ 78     $ 86     $ 236 $ 258