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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Statement of Comprehensive Income [Abstract]        
Net income $ 29,306 $ 27,074 $ 84,714 $ 52,581
Securities AFS and transferred securities:        
Change in unrealized holding (loss) gain on AFS securities during the period (27,714) 1,601 (43,527) 88,900
Reclassification adjustment for amortization related to AFS and HTM debt securities 312 394 1,118 730
Reclassification adjustment for net gain on sale of AFS securities, included in net income (1,381) (78) (3,399) (8,281)
Derivatives:        
Change in net unrealized gain (loss) on effective cash flow hedge interest rate swap derivatives 377 (197) 8,296 (25,236)
Reclassification adjustment of net loss related to derivatives designated as cash flow hedges 1,617 1,587 4,784 2,283
Pension plans:        
Amortization of net actuarial loss and prior service credit, included in net periodic benefit cost 316 819 948 2,207
Prior service cost adjustment due to plan amendment 0 0 0 163
Change in net actuarial loss 0 0 0 (7,558)
Other comprehensive income (loss), before tax (26,473) 4,126 (31,780) 53,208
Income tax benefit (expense) related to items of other comprehensive income (loss) 5,560 (866) 6,674 (11,173)
Other comprehensive (loss) income, net of tax (20,913) 3,260 (25,106) 42,035
Comprehensive income $ 8,393 $ 30,334 $ 59,608 $ 94,616