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Accumulated Other Comprehensive (Loss) Income - Changes in Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Equity [Abstract]        
Unrealized loss on securities, before tax amount $ 49,911 $ 88,637 $ 55,615 $ 48,735
Unrealized loss on securities, tax effect (11,305) (20,077) (12,597) (11,039)
Unrealized loss on securities, net of tax amount 38,606 68,560 43,018 37,696
Reclassification adjustment for securities gain included in net income, before tax amount   1 2 20,283
Reclassification adjustment for securities gain included in net income, tax effect   0 0 (4,594)
Reclassification adjustment for securities gain included in net income, net of tax amount 0 1 2 15,689
Amortization of net unrealized losses on AFS securities transferred to HTM. before-tax amount 1,719 1,837 5,171 5,445
Amortization of net unrealized losses on AFS securities transferred to HTM, tax (389) (415) (1,171) (1,233)
Amortization of net unrealized losses on AFS securities transferred to HTM, net of tax amount 1,330 1,422 4,000 4,212
Net unrealized loss on interest rate swaps used in cash flow hedges, before-tax amount (373) (8,564) 1,964 (92)
Net unrealized loss on interest rate swaps used in cash flow hedges, before-tax amount 84 1,940 (445) 21
Amount of Gain (Loss) Recognized in OCI on Derivative (289) (6,624) 1,519 (71)
Net unrealized losses on interest rate swaps used in cash flow hedges, before-tax amount 5,929 5,144 15,587 15,158
Net unrealized losses on interest rate swaps used in cash flow hedges, tax (1,343) (1,165) (3,531) (3,389)
Net unrealized losses on interest rate swaps used in cash flow hedges, net of tax amount 4,586 3,979 12,056 11,769
Amortization of net unrecognized pension and postretirement items, before tax amount (139) (135) (411) (406)
Amortization of net unrecognized pension and postretirement items, tax effect 33 29 93 89
Amortization of net unrecognized pension and postretirement items, net of tax amount (106) (106) (318) (317)
Total Other Comprehensive Income, Before Tax Amount 57,047 86,920 77,928 89,123
Total Other Comprehensive Income, Tax Effect (12,920) (19,688) (17,651) (20,145)
Other Comprehensive Income, Net of Tax $ 44,127 $ 67,232 $ 60,277 $ 68,978