v3.26.3
Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Jun. 30, 2026
Mar. 31, 2026
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Sep. 30, 2026
Sep. 30, 2025
Accumulated Other Comprehensive Income (Loss) [Roll Forward]                
Beginning Balance     $ (7,566)       $ (7,566)  
Amortization of Net Unrealized Losses on Available-for-Sale Securities Transfered to Held-to-maturity Securities $ (1,912)     $ (1,992)     (5,503) $ (5,978)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax (15,247)     (825)     (29,665) 7,707
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax (436)     1,440     (1,779) 3,995
Labor and Related Expense 153,714     135,703     450,054 386,593
Other Comprehensive Income (Loss), Net of Tax (167,723) $ (35,088) (36,939) (1,680) $ 20,847 $ 39,272 (239,750) 58,439
Ending Balance (247,316)           (247,316)  
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member]                
Accumulated Other Comprehensive Income (Loss) [Roll Forward]                
Beginning Balance (54,836)   (2,456) (6,109)   (48,993) (2,456) (48,993)
Other Comprehensive Income (Loss), before Reclassifications, before Tax (199,386)     (5,178)     (272,763) 47,970
Amortization of Net Unrealized Losses on Available-for-Sale Securities Transfered to Held-to-maturity Securities 1,912     1,992     5,503 5,978
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax 0     0     0 0
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax 0     0     0 0
Labor and Related Expense 0     0     0 0
Other Expenses       0       0
Other Comprehensive Income (Loss), Tax 49,254     795     66,660 (13,456)
Other Comprehensive Income (Loss), Net of Tax (148,220)     (2,392)     (200,600) 40,492
Ending Balance (203,056) (54,836)   (8,501) (6,109)   (203,056) (8,501)
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent                
Accumulated Other Comprehensive Income (Loss) [Roll Forward]                
Beginning Balance (6,659)   12,894 12,487   (1,268) 12,894 (1,268)
Other Comprehensive Income (Loss), before Reclassifications, before Tax 0     0     0 0
Amortization of Net Unrealized Losses on Available-for-Sale Securities Transfered to Held-to-maturity Securities 0     0     0 0
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax (15,247)     (825)     (29,665) 7,707
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax (436)     1,440     (1,779) 3,995
Labor and Related Expense 0     0     0 0
Other Expenses       0       0
Other Comprehensive Income (Loss), Tax (3,773)     148     (7,565) 2,816
Other Comprehensive Income (Loss), Net of Tax (19,456)     763     (39,009) 14,518
Ending Balance (26,115) (6,659)   13,249 12,487   (26,115) 13,249
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]                
Accumulated Other Comprehensive Income (Loss) [Roll Forward]                
Beginning Balance (18,098)   (18,003) (20,674)   (24,154) (18,003) (24,154)
Other Comprehensive Income (Loss), before Reclassifications, before Tax 0     0     0 4,770
Amortization of Net Unrealized Losses on Available-for-Sale Securities Transfered to Held-to-maturity Securities 0     0     0 0
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax 0     0     0 0
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax 0     0     0 0
Labor and Related Expense (63)     (63)     (189) (189)
Other Expenses       (4)       (12)
Other Comprehensive Income (Loss), Tax 16     17     47 (1,140)
Other Comprehensive Income (Loss), Net of Tax (47)     (51)     (142) 3,429
Ending Balance (18,145) (18,098)   (20,725) (20,674)   (18,145) (20,725)
AOCI Attributable to Parent [Member]                
Accumulated Other Comprehensive Income (Loss) [Roll Forward]                
Beginning Balance (79,593)   (7,566) (14,297)   (74,416) (7,566) (74,416)
Other Comprehensive Income (Loss), before Reclassifications, before Tax (199,386)     (5,178)     (272,763) 52,741
Amortization of Net Unrealized Losses on Available-for-Sale Securities Transfered to Held-to-maturity Securities 1,912     1,992     5,503 5,978
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification and Tax (15,247)     (825)     (29,665) 7,707
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax (436)     1,440     (1,779) 3,995
Labor and Related Expense (63)     (63)     (189) (189)
Other Expenses       (4)       (12)
Other Comprehensive Income (Loss), Tax 45,497     960     59,143 (11,780)
Other Comprehensive Income (Loss), Net of Tax (167,723) (35,088) $ (36,939) (1,680) 20,847 $ 39,272 (239,750) 58,439
Ending Balance $ (247,316) $ (79,593)   $ (15,977) $ (14,297)   $ (247,316) $ (15,977)