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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (UNAUDITED) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Statement of Comprehensive Income [Abstract]        
Net income $ 27,976 $ 4,913 $ 78,072 $ 48,233
Securities AFS and transferred securities:        
Change in unrealized holding gain (loss) on AFS securities during the period (78,909) 16,327 (85,289) (2,504)
Reclassification adjustment for amortization related to AFS and HTM debt securities 2,032 2,079 6,374 6,112
Reclassification adjustment for net (gain) loss on sale of AFS securities, included in net income 0 24,395 0 24,949
Derivatives:        
Change in net unrealized gain (loss) on effective cash flow hedge interest rate swap derivatives 3,105 828 8,812 (2,715)
Reclassification adjustment of net (gain) loss related to derivatives designated as cash flow hedges (34) (1,988) (545) (6,427)
Retirement plans:        
Amortization of net actuarial loss, included in net periodic benefit cost 668 614 2,003 1,844
Other comprehensive income (loss), before tax (73,138) 42,255 (68,645) 21,259
Income tax (expense) benefit related to items of other comprehensive income (loss) 15,358 (8,874) 14,415 (4,465)
Other comprehensive income (loss), net of tax (57,780) 33,381 (54,230) 16,794
Comprehensive income (loss) $ (29,804) $ 38,294 $ 23,842 $ 65,027