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Significant Accounting Policies and Basis of Presentation - Schedule of Error Correction on Cash Flows (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Error Corrections and Prior Period Adjustments Restatement [Line Items]      
Origination of loans held for sale $ (41,172) $ (39,750) $ (39,257)
Proceeds from the sale of loans held for sale 40,656 42,772 40,815
Net Cash Provided by (Used in) Operating Activities 62,193 91,403 66,569
Origination of mortgage warehouse loans (30,084,255) (36,091,174) (29,886,506)
Proceeds from repayments of mortgage warehouse loans 30,407,662 35,729,309 29,463,289
Net Cash Used in Investing Activities (565,125) (961,534) (1,681,443)
As Previously Reported      
Error Corrections and Prior Period Adjustments Restatement [Line Items]      
Origination of loans held for sale (30,125,427) (36,130,924) (29,925,763)
Proceeds from the sale of loans held for sale 30,448,318 35,772,081 29,504,104
Net Cash Provided by (Used in) Operating Activities 385,600 (270,462) (356,648)
Origination of mortgage warehouse loans 0 0 0
Proceeds from repayments of mortgage warehouse loans 0 0 0
Net Cash Used in Investing Activities (888,532) (599,669) (1,258,226)
Adjustment      
Error Corrections and Prior Period Adjustments Restatement [Line Items]      
Origination of loans held for sale 30,084,255 36,091,174 29,886,506
Proceeds from the sale of loans held for sale (30,407,662) (35,729,309) (29,463,289)
Net Cash Provided by (Used in) Operating Activities (323,407) 361,865 423,217
Origination of mortgage warehouse loans (30,084,255) (36,091,174) (29,886,506)
Proceeds from repayments of mortgage warehouse loans 30,407,662 35,729,309 29,463,289
Net Cash Used in Investing Activities $ 323,407 $ (361,865) $ (423,217)