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Consolidated Statement of Comprehensive Income - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Statement of Comprehensive Income [Abstract]      
Net income $ 400,313 $ 323,752 $ 225,482
Unrealized gains (losses) on securities available for sale:      
Change in unrealized gains (losses) on securities available for sale arising during period 29,170 28,166 (21,530)
Tax effect (6,709) (10,531) 7,584
Reclassification adjustment for gains included in income before income taxes (351) (4,293) (26,673)
Tax effect 81 1,588 9,869
Total change in unrealized gains (losses) on securities available for sale, net of tax 22,191 14,930 (30,750)
Unrealized losses on securities available for sale transferred to held to maturity [Abstract]      
Unrealized losses on securities available for sale transferred to held to maturity (109,507) 0 0
Tax effect 25,186 0 0
Reclassification adjustment for accretion of unrealized losses on securities available for sale transferred to held to maturity 17,106 0 0
Tax effect (3,934) 0 0
Total change in unrealized losses on securities available for sale transferred to held to maturity, net of tax (71,149) 0 0
Change in fair value of cash flow hedges:      
Change in unrecognized loss on cash flow hedges 0 0 1,429
Tax effect 0 0 (537)
Total change in unrecognized loss on cash flow hedges, net of tax 0 0 892
Change in pension obligation:      
Increase in pension obligation (32,012) (12,945) (70,424)
Tax effect 7,363 4,789 25,077
Amortization of actuarial losses and prior service cost 13,981 9,720 7,069
Tax effect (3,216) (3,596) (2,616)
Total change in pension obligation, net of tax (13,884) (2,032) (40,894)
Net current period other comprehensive income (loss) (62,842) 12,898 (70,752)
Total comprehensive income $ 337,471 $ 336,650 $ 154,730