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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Statement of Comprehensive Income [Abstract]      
Net income $ 86,692 $ 105,020 $ 113,401
Securities AFS and transferred securities:      
Change in unrealized holding gain (loss) on AFS securities during the period 28,782 (179,684) (37,199)
Change in net unrealized loss on securities transferred from AFS to HTM 0 (125,175) 0
Reclassification adjustment for amortization related to AFS and HTM debt securities 8,004 4,968 1,363
Reclassification adjustment for net (gain) loss on sale of AFS securities, included in net income 15,976 3,819 (3,862)
Derivatives:      
Change in net unrealized gain (loss) on effective cash flow hedge interest rate swap derivatives 1,222 44,757 13,648
Reclassification adjustment of net (gain) loss related to derivatives designated as cash flow hedges (24,544) (3,638) 6,395
Retirement plans:      
Amortization of net actuarial loss, included in net periodic benefit cost 756 895 1,264
Effect of settlement recognition (16) 0 0
Change in net actuarial gain (loss) 192 4,487 6,524
Other comprehensive income (loss), before tax 30,372 (249,571) (11,867)
Income tax (expense) benefit related to items of other comprehensive income (loss) (6,378) 52,410 2,492
Other comprehensive income (loss), net of tax 23,994 (197,161) (9,375)
Comprehensive income (loss) $ 110,686 $ (92,141) $ 104,026