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Shareholders' Equity - Net Change in Components of Accumulated Other Comprehensive Income (Loss) and the Related Tax Effects (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Other comprehensive income (loss), before tax amount $ 93,377 $ 181,419 $ 73,931
Other Comprehensive Income (Loss), Tax, Total (23,343) (45,355) (18,251)
Other comprehensive income (loss), before reclassifications, net of tax amount 62,846 (14,888) 43,185
Reclassification from accumulated other comprehensive income, current period, net of tax amount 7,188 150,952 12,495
Other comprehensive income (loss), net of tax amount 70,034 136,064 55,680
Securities Available for Sale and Transferred Securities [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Other comprehensive income (loss), before reclassifications, before tax amount 61,389 (13,666) 50,537
Reclassification from accumulated other comprehensive income, current period, before tax amount 0 182,792 (39)
Other comprehensive income (loss), change in net unrealized holding loss on securities transferred to held to maturity, before tax amount 13,765 14,587 15,557
Other comprehensive income (loss), before tax amount 75,154 183,713 66,055
Other comprehensive income (loss), before reclassifications, tax (expense) benefit (15,346) 3,417 (12,404)
Reclassification from accumulated other comprehensive income, current period, tax (expense) benefit 0 (45,698) 10
Other comprehensive income (loss), change in net unrealized holding loss on securities transferred to held to maturity, tax (expense) benefit (3,441) (3,647) (3,889)
Other Comprehensive Income (Loss), Tax, Total (18,787) (45,928) (16,283)
Other comprehensive income (loss), before reclassifications, net of tax amount 46,043 (10,249) 38,133
Reclassification from accumulated other comprehensive income, current period, net of tax amount 0 137,094 (29)
Other comprehensive income (loss), change in net unrealized holding loss on securities transferred to held to maturity, net of tax amount 10,324 10,940 11,668
Other comprehensive income (loss), net of tax amount 56,367 137,785 49,772
Net Change in Prior Service Costs [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Reclassification from accumulated other comprehensive income, current period, before tax amount (15) 111 111
Reclassification from accumulated other comprehensive income, current period, tax (expense) benefit 4 (28) (28)
Reclassification from accumulated other comprehensive income, current period, net of tax amount (11) 83 83
Recognized Net Loss Due to Lump Sum Settlements [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Reclassification from accumulated other comprehensive income, current period, before tax amount (79) (13) 25
Reclassification from accumulated other comprehensive income, current period, tax (expense) benefit 20 3 (6)
Reclassification from accumulated other comprehensive income, current period, net of tax amount (59) (10) 19
Change in Net Actuarial Loss [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Other comprehensive income (loss), before reclassifications, before tax amount (660) 1,460 (691)
Reclassification from accumulated other comprehensive income, current period, before tax amount 127 248 177
Other comprehensive income (loss), before reclassifications, tax (expense) benefit 165 (365) 173
Reclassification from accumulated other comprehensive income, current period, tax (expense) benefit (32) (62) (44)
Other comprehensive income (loss), before reclassifications, net of tax amount (495) 1,095 (518)
Reclassification from accumulated other comprehensive income, current period, net of tax amount 95 186 133
Pension and Other Postretirement Benefit Plans [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Reclassification from accumulated other comprehensive income, current period, before tax amount (597) 1,806 (378)
Reclassification from accumulated other comprehensive income, current period, tax (expense) benefit 149 (452) 95
Reclassification from accumulated other comprehensive income, current period, net of tax amount (448) 1,354 (283)
Cash Flow Hedge Derivatives [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Other comprehensive income (loss), before reclassifications, before tax amount 9,299 (22,232) (8,131)
Reclassification from accumulated other comprehensive income, current period, before tax amount 9,521 18,132 16,385
Other comprehensive income (loss), before tax amount 18,820 (4,100) 8,254
Other comprehensive income (loss), before reclassifications, tax (expense) benefit (2,325) 5,558 2,033
Reclassification from accumulated other comprehensive income, current period, tax (expense) benefit (2,380) (4,533) (4,096)
Other Comprehensive Income (Loss), Tax, Total (4,705) 1,025 (2,063)
Other comprehensive income (loss), before reclassifications, net of tax amount 6,974 (16,674) (6,098)
Reclassification from accumulated other comprehensive income, current period, net of tax amount 7,141 13,599 12,289
Other comprehensive income (loss), net of tax amount $ 14,115 $ (3,075) $ 6,191