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Parent Company Only Financial Statements - Condensed Statements of Comprehensive Income (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Condensed Statement of Income Captions [Line Items]      
Net income $ 528,904 $ 332,552 $ 321,812
Securities available for sale:      
Change in unrealized gains during the period 212 370 535
Total other comprehensive income 212 370 535
Deferred tax expense related to other comprehensive income (45) (78) (112)
Other comprehensive income, net of tax 167 292 423
Comprehensive income 529,071 332,844 322,235
Parent Company [Member]      
Condensed Statement of Income Captions [Line Items]      
Net income 528,904 332,552 321,812
Securities available for sale:      
Change in unrealized gains during the period 212 370 535
Total other comprehensive income 212 370 535
Deferred tax expense related to other comprehensive income (45) (78) (112)
Other comprehensive income, net of tax 167 292 423
Comprehensive income $ 529,071 $ 332,844 $ 322,235