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Loans Held for Sale - Composition of Loans Held for Sale (Detail) - USD ($) $ in Thousands	6 Months Ended		12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Receivables Held-for-sale [Abstract]
Mortgage warehouse loans, at fair value	$ 2,101,641		$ 2,116,815
Multi-family loans at lower of cost or fair value	150,758		0
Total commercial loans held for sale	2,252,399		2,116,815
Residential mortgage loans, at fair value	2,697		695
Loans held for sale	$ 2,255,096		2,117,510
Loans held for sale, average life from purchase to sale	20 days
Transfer of loans held for investment to loans held for sale	$ 150,758	$ 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

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-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

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-Publisher FASB
-Name Accounting Standards Codification
-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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Topic 310
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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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