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Significant Accounting Policies and Basis of Presentation - Schedule of Error Correction on Balance Sheet (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Error Corrections and Prior Period Adjustments Restatement [Line Items]    
Loans held for sale, carrying value $ 146,077 $ 695
Loans receivable, mortgage warehouse, at fair value 1,793,408 2,116,815
Loans receivable, net of allowance for loan losses, carrying value 8,523,651 8,234,137
As Previously Reported    
Error Corrections and Prior Period Adjustments Restatement [Line Items]    
Loans held for sale, carrying value 1,939,485 2,117,510
Loans receivable, mortgage warehouse, at fair value 0 0
Loans receivable, net of allowance for loan losses, carrying value 6,730,243 6,117,322
Adjustment    
Error Corrections and Prior Period Adjustments Restatement [Line Items]    
Loans held for sale, carrying value (1,793,408) (2,116,815)
Loans receivable, mortgage warehouse, at fair value 1,793,408 2,116,815
Loans receivable, net of allowance for loan losses, carrying value $ 1,793,408 $ 2,116,815