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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Statement of Comprehensive Income [Abstract]        
Net income $ 18,449 $ 26,951 $ 69,376 $ 77,352
Securities AFS and transferred securities:        
Change in unrealized holding gain (loss) on AFS securities during the period (52,882) (61,354) (33,032) (256,778)
Change in net unrealized loss on securities transferred from AFS to HTM 0 (6,367) 0 (97,871)
Reclassification adjustment for amortization related to AFS and HTM debt securities 2,008 1,396 5,989 2,949
Reclassification adjustment for net (gain) loss on sale of AFS securities, included in net income (11) 99 5,590 3,819
Derivatives:        
Change in net unrealized gain (loss) on effective cash flow hedge interest rate swap derivatives 7,377 15,226 16,277 42,819
Reclassification adjustment of net (gain) loss related to derivatives designated as cash flow hedges (6,408) (1,572) (17,570) 94
Pension plans:        
Amortization of net actuarial loss, included in net periodic benefit cost 189 224 567 671
Other comprehensive income (loss), before tax (49,727) (52,348) (22,179) (304,297)
Income tax (expense) benefit related to items of other comprehensive income (loss) 10,443 10,993 4,658 63,902
Other comprehensive income (loss), net of tax (39,284) (41,355) (17,521) (240,395)
Comprehensive income (loss) $ (20,835) $ (14,404) $ 51,855 $ (163,043)