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Loans Held for Sale - Composition of Loans Held for Sale (Detail) - USD ($) $ in Thousands			9 Months Ended
	Jun. 30, 2017	Dec. 31, 2016	Sep. 30, 2017	Sep. 30, 2016
Receivables Held-for-sale [Abstract]
Mortgage warehouse loans, at fair value		$ 2,116,815	$ 1,961,248
Multi-family loans at lower of cost or fair value		0	150,217
Total commercial loans held for sale		2,116,815	2,111,465
Residential mortgage loans, at fair value		695	1,828
Loans held for sale		2,117,510	$ 2,113,293
Loans held for sale, average life from purchase to sale			21 days
Transfer of loans held for investment to loans held for sale	$ 150,800		$ 150,638	$ 0
Transfer of loans held for sale to held for investment		$ 25,100

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Amount, after allowance for bad debt, of loan receivables held-for-sale that are not part of a disposal group. Excludes loans and leases covered under loss sharing agreements and loans classified as debt securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522

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Amount, after allowance for bad debt, of commercial mortgage loan receivables held-for-sale that are not part of a disposal group. Excludes loans and leases covered under loss sharing agreements and loans classified as debt securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
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Amount, after allowance for bad debt, of mortgage loan receivables held-for-sale that are not part of a disposal group. Excludes loans and leases covered under loss sharing agreements and loans classified as debt securities.

+ References

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Value of loans held-for-sale transferred to loans held in the entity's portfolio in noncash transactions.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
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