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Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Statement of Comprehensive Income [Abstract]        
Net income $ 153,786 $ 119,359 $ 210,955 $ 230,718
Unrealized (losses) gains on securities available for sale:        
Unrealized gains on securities available for sale arising during the period 28,066 30,971 172,909 59,042
Tax effect (6,455) (7,123) (39,768) (13,579)
Reclassification adjustment for realized gains on securities available for sale included in income before income taxes (13,752) (5,719) (33,547) (5,719)
Tax effect 3,163 1,315 7,716 1,315
Total change in unrealized (losses) gains on securities available for sale, net of tax 11,022 19,444 107,310 41,059
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 5,947 0 11,909
Tax effect 0 (1,368) 0 (2,739)
Total change in unrealized losses on securities available for sale transferred to held to maturity, net of tax 0 4,579 0 9,170
Change in pension obligation:        
Amortization of actuarial losses and prior service cost 6,398 2,735 12,662 5,490
Tax effect (1,472) (629) (2,913) (1,263)
Total change in pension obligation, net of tax 4,926 2,106 9,749 4,227
Net current period other comprehensive income 15,948 26,129 117,059 54,456
Total comprehensive income $ 169,734 $ 145,488 $ 328,014 $ 285,174