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Consolidated Statement of Comprehensive Income - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Statement of Comprehensive Income [Abstract]      
Net income $ 457,371 $ 400,313 $ 323,752
Unrealized gains on securities available for sale:      
Unrealized gains on securities available for sale arising during the period 64,644 29,170 28,166
Tax effect (14,868) (6,709) (10,531)
Reclassification adjustment for realized gains on securities available for sale included in income before income taxes (7,115) (351) (4,293)
Tax effect 1,636 81 1,588
Unrealized gains on securities available for sale arising during the period, net of tax 44,297 22,191 14,930
Unrealized losses on securities available for sale transferred to held to maturity [Abstract]      
Unrealized losses on securities available for sale transferred from (to) held to maturity 72,512 (109,507) 0
Tax effect (16,678) 25,186 0
Reclassification adjustment for accretion of unrealized losses on securities available for sale transferred to held to maturity 19,889 17,106 0
Tax effect (4,574) (3,934) 0
Total change in unrealized losses on securities available for sale transferred from (to) held to maturity, net of tax 71,149 (71,149) 0
Change in fair value of cash flow hedges:      
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax 20,049 32,012 12,945
Defined benefit pension items:      
Actuarial losses arising during the period (20,049) (32,012) (12,945)
Tax effect 4,611 7,363 4,789
Amortization of actuarial losses and prior service cost 10,981 13,981 9,720
Tax effect (2,525) (3,216) (3,596)
Total change from defined benefit plans, net of tax 6,982 13,884 2,032
Net current period other comprehensive income (loss) 108,464 (62,842) 12,898
Total comprehensive income $ 565,835 $ 337,471 $ 336,650