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Loans Held for Sale - Composition of Loans Held for Sale (Detail) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended	12 Months Ended
	Mar. 31, 2018	Jun. 30, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Receivables Held-for-sale [Abstract]
Multi-family loans, at lower of cost or fair value			$ 0	$ 144,191
Total commercial loans held for sale			0	144,191
Residential mortgage loans, at fair value			1,507	1,886
Loans held for sale			1,507	146,077
Transfer of loans from held for sale to held for investment	$ 129,700		129,691	0	$ 25,118
Transfer of loans from held for investment to held for sale		$ 150,600	$ 0	$ 150,638	$ 0

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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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-Section 45
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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.

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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.

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

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