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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (UNAUDITED) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Statement of Comprehensive Income [Abstract]        
Net income $ 26,837 $ 21,813 $ 50,096 $ 43,320
Securities AFS and transferred securities:        
Change in unrealized holding gain (loss) on AFS securities during the period 7,952 (12,618) (6,380) (18,831)
Reclassification adjustment for amortization related to AFS and HTM debt securities 2,238 2,019 4,342 4,033
Reclassification adjustment for net (gain) loss on sale of AFS securities, included in net income 0 0 0 554
Derivatives:        
Change in net unrealized gain (loss) on effective cash flow hedge interest rate swap derivatives 2,467 (392) 5,707 (3,543)
Reclassification adjustment of net (gain) loss related to derivatives designated as cash flow hedges 35 (1,866) (511) (4,439)
Retirement plans:        
Amortization of net actuarial loss, included in net periodic benefit cost 668 616 1,335 1,230
Other comprehensive income (loss), before tax 13,360 (12,241) 4,493 (20,996)
Income tax (expense) benefit related to items of other comprehensive income (loss) (2,805) 2,570 (943) 4,409
Other comprehensive income (loss), net of tax 10,555 (9,671) 3,550 (16,587)
Comprehensive income (loss) $ 37,392 $ 12,142 $ 53,646 $ 26,733