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Significant Accounting Policies and Basis of Presentation - Schedule of Error Correction on Balance Sheet (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Error Corrections and Prior Period Adjustments Restatement [Line Items]    
Loans held for sale, Carrying Amount $ 1,043 $ 146,077
Loans receivable, mortgage warehouse, at fair value 1,930,738 1,793,408
Loans receivable, net of allowance for loan losses 9,074,176 $ 8,523,651
Previously Reported    
Error Corrections and Prior Period Adjustments Restatement [Line Items]    
Loans held for sale, Carrying Amount 1,931,781  
Loans receivable, mortgage warehouse, at fair value 0  
Loans receivable, net of allowance for loan losses 7,143,438  
Adjustment    
Error Corrections and Prior Period Adjustments Restatement [Line Items]    
Loans held for sale, Carrying Amount (1,930,738)  
Loans receivable, mortgage warehouse, at fair value 1,930,738  
Loans receivable, net of allowance for loan losses $ 1,930,738