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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 | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Other comprehensive income (loss), before tax amount | $ 24,285 | $ 180,796 | $ 70,893 | $ 170,888
Other Comprehensive Income (Loss), Tax, Total | (6,072) | (45,199) | (17,723) | (42,722)
Other comprehensive income (loss), before reclassifications, net of tax amount |  |  | 49,082 | (16,361)
Reclassification from accumulated other comprehensive income, current period, net of tax amount |  |  | 4,088 | 144,527
Other comprehensive income (loss), net of tax amount | 18,213 | 135,597 | 53,170 | 128,166
Securities Available for Sale and Transferred Securities [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Other comprehensive income (loss), before reclassifications, before tax amount | 13,992 | (5,761) | 46,591 | (8,313)
Reclassification from accumulated other comprehensive income, current period, before tax amount | 0 | 182,792 | 0 | 182,792
Other comprehensive income (loss), change in net unrealized holding loss on securities transferred to held to maturity, before tax amount | 3,450 | 3,671 | 6,875 | 7,332
Other comprehensive income (loss), before tax amount | 17,442 | 180,702 | 53,466 | 181,811
Other comprehensive income (loss), before reclassifications, tax (expense) benefit | (3,499) | 1,440 | (11,648) | 2,078
Reclassification from accumulated other comprehensive income, current period, tax (expense) benefit | 0 | (45,698) | 0 | (45,698)
Other comprehensive income (loss), change in net unrealized holding loss on securities transferred to held to maturity, tax (expense) benefit | (863) | (918) | (1,719) | (1,833)
Other Comprehensive Income (Loss), Tax, Total | (4,362) | (45,176) | (13,367) | (45,453)
Other comprehensive income (loss), before reclassifications, net of tax amount | 10,493 | (4,321) | 34,943 | (6,235)
Reclassification from accumulated other comprehensive income, current period, net of tax amount | 0 | 137,094 | 0 | 137,094
Other comprehensive income (loss), change in net unrealized holding loss on securities transferred to held to maturity, net of tax amount | 2,587 | 2,753 | 5,156 | 5,499
Other comprehensive income (loss), net of tax amount | 13,080 | 135,526 | 40,099 | 136,358
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 | 3 | 27 | 7 | 55
Reclassification from accumulated other comprehensive income, current period, tax (expense) benefit | 0 | (7) | (1) | (14)
Reclassification from accumulated other comprehensive income, current period, net of tax amount | 3 | 20 | 6 | 41
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 | 0 | (13) | (50) | (13)
Reclassification from accumulated other comprehensive income, current period, tax (expense) benefit | 0 | 3 | 12 | 3
Reclassification from accumulated other comprehensive income, current period, net of tax amount | 0 | (10) | (38) | (10)
Change in Net Actuarial Loss [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Reclassification from accumulated other comprehensive income, current period, before tax amount | 61 | 84 | 132 | 179
Reclassification from accumulated other comprehensive income, current period, tax (expense) benefit | (16) | (20) | (33) | (44)
Reclassification from accumulated other comprehensive income, current period, net of tax amount | 45 | 64 | 99 | 135
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 | 64 | 98 | 89 | 221
Reclassification from accumulated other comprehensive income, current period, tax (expense) benefit | (16) | (24) | (22) | (55)
Reclassification from accumulated other comprehensive income, current period, net of tax amount | 48 | 74 | 67 | 166
Cash Flow Hedge Derivatives [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Other comprehensive income (loss), before reclassifications, before tax amount | 4,098 | (4,873) | 11,977 | (20,833)
Reclassification from accumulated other comprehensive income, current period, before tax amount | 2,681 | 4,869 | 5,361 | 9,689
Other comprehensive income (loss), before tax amount | 6,779 | (4) | 17,338 | (11,144)
Other comprehensive income (loss), before reclassifications, tax (expense) benefit | (1,024) | 1,218 | (2,994) | 5,208
Reclassification from accumulated other comprehensive income, current period, tax (expense) benefit | (670) | (1,217) | (1,340) | (2,422)
Other Comprehensive Income (Loss), Tax, Total | (1,694) | 1 | (4,334) | 2,786
Other comprehensive income (loss), before reclassifications, net of tax amount | 3,074 | (3,655) | 8,983 | (15,625)
Reclassification from accumulated other comprehensive income, current period, net of tax amount | 2,011 | 3,652 | 4,021 | 7,267
Other comprehensive income (loss), net of tax amount | $ 5,085 | $ (3) | $ 13,004 | $ (8,358)

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