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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
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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

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