v3.25.2
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)