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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2020
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Statement of Comprehensive Income [Abstract]        
Net income   $ 105,020 $ 113,401 $ 82,153
Securities AFS and transferred securities:        
Change in unrealized holding gain (loss) on AFS securities during the period   (179,684) (37,199) 105,845
Change in net unrealized loss on securities transferred from AFS to HTM   (125,175) 0 0
Reclassification adjustment for amortization related to AFS and HTM debt securities   4,968 1,363 1,197
Reclassification adjustment for net (gain) loss on sale of AFS securities, included in net income   3,819 (3,862) (8,257)
Derivatives:        
Change in net unrealized gain (loss) on effective cash flow hedge interest rate swap derivatives   44,757 13,648 (23,462)
Reclassification adjustment of net (gain) loss related to derivatives designated as cash flow hedges   (3,638) 6,395 3,945
Retirement plans:        
Amortization of net actuarial loss, included in net periodic benefit cost   895 1,264 3,028
Effect of settlement recognition   0 0 215
Prior service cost adjustment due to plan amendments $ 163 0 0 163
Change in net actuarial gain (loss)   4,487 6,524 (593)
Other comprehensive income (loss), before tax   (249,571) (11,867) 82,081
Income tax (expense) benefit related to items of other comprehensive income (loss)   52,410 2,492 (17,237)
Other comprehensive income (loss), net of tax   (197,161) (9,375) 64,844
Comprehensive income (loss)   $ (92,141) $ 104,026 $ 146,997