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Allowance for Loan Losses - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended
Jan. 01, 2020
Mar. 31, 2020
Dec. 31, 2019
Mar. 31, 2019
Financing Receivable, Allowance for Credit Loss [Line Items]        
Qualitative adjustments included in the ACL   $ 6,000    
Change in ACL during period   (79,700)    
Loans held for investment   8,754,869 $ 8,722,311  
Provision for credit losses   $ 25,454 $ 2,297 $ 1,526
Accounting Standards Update 2016-13        
Financing Receivable, Allowance for Credit Loss [Line Items]        
Loans held for investment $ 55,700      
Provision for credit losses 25,400      
Net charge-offs $ 1,300