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Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Statement of Comprehensive Income [Abstract]        
Net income $ 142,684 $ 124,779 $ 353,639 $ 355,497
Unrealized (losses) gains on securities available for sale:        
Unrealized gains on securities available for sale arising during the period 9,781 3,932 182,690 62,974
Tax effect (2,251) (906) (42,019) (14,485)
Reclassification adjustment for realized gains on securities available for sale included in income before income taxes (21,425) (1,136) (54,972) (6,855)
Tax effect 4,928 262 12,644 1,577
Total change in unrealized (losses) gains on securities available for sale, net of tax (8,967) 2,152 98,343 43,211
Unrealized losses on securities available for sale transferred to held to maturity:        
Reclassification adjustment for accretion of unrealized losses on securities available for sale transferred to held to maturity 0 6,095 0 18,004
Tax effect 0 (1,402) 0 (4,141)
Total change in unrealized losses on securities available for sale transferred to held to maturity, net of tax 0 4,693 0 13,863
Change in pension obligation:        
Amortization of actuarial losses and prior service cost 6,332 2,745 18,994 8,235
Tax effect (1,457) (631) (4,370) (1,894)
Total change in pension obligation, net of tax 4,875 2,114 14,624 6,341
Net current period other comprehensive (loss) income (4,092) 8,959 112,967 63,415
Total comprehensive income $ 138,592 $ 133,738 $ 466,606 $ 418,912