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Parent Company Only Financial Statements - Condensed Statements of Comprehensive Income (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Condensed Statement of Income Captions [Line Items]      
Net income $ 321,812 $ 272,165 $ 274,466
Securities available for sale:      
Change in unrealized gain or loss during the period 535 (2,314) (967)
Total other comprehensive income (loss) 535 (2,314) (967)
Deferred tax related to other comprehensive income or loss (112) 790 338
Other comprehensive income (loss), net of tax 423 (1,524) (629)
Comprehensive income 322,235 270,641 273,837
Parent Company [Member]      
Condensed Statement of Income Captions [Line Items]      
Net income 321,812 272,165 274,466
Securities available for sale:      
Change in unrealized gain or loss during the period 535 (2,314) (967)
Total other comprehensive income (loss) 535 (2,314) (967)
Deferred tax related to other comprehensive income or loss (112) 790 338
Other comprehensive income (loss), net of tax 423 (1,524) (629)
Comprehensive income $ 322,235 $ 270,641 $ 273,837