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Significant Accounting Policies and Basis of Presentation - Schedule of Error Correction on Cash Flows (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Error Corrections and Prior Period Adjustments Restatement [Line Items]    
Origination of loans held for sale $ (22,978) $ (32,343)
Proceeds from the sale of loans held for sale 23,936 31,718
Net Cash Provided By Operating Activities 98,365 30,322
Origination of mortgage warehouse loans (21,739,744) (22,738,383)
Proceeds from repayments of mortgage warehouse loans 22,016,825 22,893,950
Net Cash Used In Investing Activities $ (289,091) (1,111,861)
Previously Reported    
Error Corrections and Prior Period Adjustments Restatement [Line Items]    
Origination of loans held for sale   (22,770,726)
Proceeds from the sale of loans held for sale   22,925,668
Net Cash Provided By Operating Activities   185,889
Origination of mortgage warehouse loans   0
Proceeds from repayments of mortgage warehouse loans   0
Net Cash Used In Investing Activities   (1,267,428)
Adjustment    
Error Corrections and Prior Period Adjustments Restatement [Line Items]    
Origination of loans held for sale   22,738,383
Proceeds from the sale of loans held for sale   (22,893,950)
Net Cash Provided By Operating Activities   (155,567)
Origination of mortgage warehouse loans   (22,738,383)
Proceeds from repayments of mortgage warehouse loans   22,893,950
Net Cash Used In Investing Activities   $ 155,567