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Significant Accounting Policies and Basis of Presentation - Schedule of Error Correction on Cash Flows (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Origination of loans held for sale	$ (11,554)	$ (20,442)
Proceeds from the sale of loans held for sale	12,640	18,721
Net Cash (Used In) Provided By Operating Activities	65,471	12,333
Origination of mortgage warehouse loans	(14,260,621)	(14,693,838)
Proceeds from repayments of mortgage warehouse loans	14,123,291	14,709,013
Net Cash Used In Investing Activities	(1,179,191)	(1,322,891)
Previously Reported
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Origination of loans held for sale	(14,272,175)	(14,714,280)
Proceeds from the sale of loans held for sale	14,135,931	14,727,734
Net Cash (Used In) Provided By Operating Activities	(71,859)	27,508
Origination of mortgage warehouse loans	0	0
Proceeds from repayments of mortgage warehouse loans	0	0
Net Cash Used In Investing Activities	(1,041,861)	(1,338,066)
Adjustment
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Origination of loans held for sale	14,260,621	14,693,838
Proceeds from the sale of loans held for sale	(14,123,291)	(14,709,013)
Net Cash (Used In) Provided By Operating Activities	137,330	(15,175)
Origination of mortgage warehouse loans	(14,260,621)	(14,693,838)
Proceeds from repayments of mortgage warehouse loans	14,123,291	14,709,013
Net Cash Used In Investing Activities	$ (137,330)	$ 15,175

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- Definition

Cash outflows related to the origination of mortgage warehouse loans under master warehouse lending agreements with mortgage companies. Excludes loans classified as held for sale.

+ References

No definition available.

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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

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- Definition

Amount of cash inflow (outflow) from investing activities, including 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/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 24
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3521-108585

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Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.

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-Topic 230
-SubTopic 10
-Section 45
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The amount of cash paid for the origination of mortgages that are held for sale.

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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.

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