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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
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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)

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- Definition Cash inflows related to the payoffs of mortgage warehouse loans under master warehouse lending agreements with mortgage companies. Excludes loans classified as held for sale. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Amount of cash inflow (outflow) of investing activities, excluding discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3574-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3521-108585 + Details
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- Definition Amount of cash inflow (outflow) from operating activities, excluding discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3521-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3536-108585 + Details
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- Definition The amount of cash paid for the origination of mortgages that are held for sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3536-108585 + Details
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- Definition The cash inflow from sales of loans that are secured with real estate mortgages and are held with the intention to resell in the near future. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3536-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 21 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3461-108585 + Details
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