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Fair Value of Financial Instruments - Assets and Liabilities Measured at Fair Value on Non-Recurring Basis (Detail) - Fair Value, Measurements, Nonrecurring - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items] |  |
Residential loans, at lower of cost or fair value | $ 1,096 | $ 1,104
REO | 2,395 | 2,069
Guarantee obligation | 4,414 | 7,201
Level 3 |  |
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items] |  |
Residential loans, at lower of cost or fair value | 1,096 | 1,104
REO | 2,395 | 2,069
Guarantee obligation | 4,414 | 7,201
Residential Loans at Lower of Cost or Fair Value |  |
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items] |  |
Gain (Loss) on assets measured at fair value on a non-recurring basis | 3 | (1)
REO |  |
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Line Items] |  |
Gain (Loss) on assets measured at fair value on a non-recurring basis | $ (764) | $ (320)

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- Definition For each line item in the statement of financial position, the amounts of gains and losses from fair value changes included in earnings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14172-108612 + Details
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- Definition Fair value portion of guarantee, including, but not limited to, financial standby letter of credit, fair value guarantee, guarantee of collection of scheduled contractual cash flows from financial assets, and contracts that contingently require the guarantor to make payments or perform services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12201-110248 + Details
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