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Commercial Loans - Loan Product Type and Accompanying Loan Characteristics of Commercial Loans (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($) loan	Dec. 31, 2014 USD ($) loan
Commercial Loans Held For Investment
Commercial Loans [Line Items]
Number of loans | loan	3	3
Principal value	$ 67,000	$ 68,000
Commercial Loans Held For Investment | Fixed Loans
Commercial Loans [Line Items]
Number of loans | loan	56	56
Principal value	$ 285,262	$ 300,748
30-89 Days DQ	0	0
90+ Days DQ	$ 0	$ 0
Commercial Loans Held For Investment | Fixed Loans | Range 1
Commercial Loans [Line Items]
Interest Rate, minimum	9.50%	9.50%
Interest Rate, maximum	12.50%	12.50%
Number of loans | loan	40	37
Principal value	$ 109,973	$ 102,994
30-89 Days DQ	0	0
90+ Days DQ	$ 0	$ 0
Commercial Loans Held For Investment | Fixed Loans | Range 2
Commercial Loans [Line Items]
Interest Rate, minimum	4.43%	4.43%
Interest Rate, maximum	11.00%	11.00%
Number of loans | loan	11	14
Principal value	$ 87,510	$ 109,551
30-89 Days DQ	0	0
90+ Days DQ	$ 0	$ 0
Commercial Loans Held For Investment | Fixed Loans | Range 3
Commercial Loans [Line Items]
Interest Rate, minimum	9.50%	9.50%
Interest Rate, maximum	9.50%	9.50%
Number of loans | loan	3	2
Principal value	$ 42,374	$ 24,874
30-89 Days DQ	0	0
90+ Days DQ	$ 0	$ 0
Commercial Loans Held For Investment | Fixed Loans | Range 4
Commercial Loans [Line Items]
Interest Rate, minimum	10.50%	10.50%
Interest Rate, maximum	11.00%	11.00%
Number of loans | loan	1	2
Principal value	$ 20,000	$ 37,700
30-89 Days DQ	0	0
90+ Days DQ	$ 0	$ 0
Commercial Loans Held For Investment | Fixed Loans | Range 5
Commercial Loans [Line Items]
Interest Rate	10.00%	10.00%
Number of loans | loan	1	1
Principal value	$ 25,405	$ 25,629
30-89 Days DQ	0	0
90+ Days DQ	$ 0	$ 0
Commercial Loans Held For Investment | ARM Loans
Commercial Loans [Line Items]
Number of loans | loan	59	60
Principal value	$ 307,047	$ 341,750
30-89 Days DQ	0	0
90+ Days DQ	$ 0	$ 0
Commercial Loans Held For Investment | ARM Loans | Range 1
Commercial Loans [Line Items]
Interest Rate, minimum	11.20%	10.80%
Interest Rate, maximum	11.20%	12.00%
Number of loans | loan	1	2
Principal value	$ 1,330	$ 15,478
30-89 Days DQ	0	0
90+ Days DQ	$ 0	$ 0
Commercial Loans Held For Investment | ARM Loans | Range 2
Commercial Loans [Line Items]
Interest Rate, minimum	12.00%	9.16%
Interest Rate, maximum	12.00%	11.20%
Number of loans | loan	1	2
Principal value	$ 5,455	$ 25,524
30-89 Days DQ	0	0
90+ Days DQ	$ 0	$ 0
Commercial Loans Held For Investment | ARM Loans | Range 3
Commercial Loans [Line Items]
Interest Rate, minimum	9.16%
Interest Rate, maximum	9.16%
Number of loans | loan	1
Principal value	$ 15,000
30-89 Days DQ	0
90+ Days DQ	$ 0
Commercial Loans Held For Investment | ARM Loans | Range 4
Commercial Loans [Line Items]
Number of loans | loan	3	4
Principal value	$ 21,785	$ 41,002
30-89 Days DQ	0	0
90+ Days DQ	$ 0	$ 0
Commercial Loans Held-for-Investment, at Fair Value | Fixed Loans
Commercial Loans [Line Items]
Number of loans | loan	6	6
Principal value	$ 66,962	$ 67,556
30-89 Days DQ	0	0
90+ Days DQ	$ 0	$ 0
Commercial Loans Held-for-Investment, at Fair Value | Fixed Loans | Range 1
Commercial Loans [Line Items]
Interest Rate	10.00%	10.00%
Number of loans | loan	3	3
Principal value	$ 4,505	$ 4,555
30-89 Days DQ	0	0
90+ Days DQ	$ 0	$ 0
Commercial Loans Held-for-Investment, at Fair Value | Fixed Loans | Range 2
Commercial Loans [Line Items]
Interest Rate	4.95%	4.95%
Number of loans | loan	1	1
Principal value	$ 11,169	$ 11,399
30-89 Days DQ	0	0
90+ Days DQ	$ 0	$ 0
Commercial Loans Held-for-Investment, at Fair Value | Fixed Loans | Range 3
Commercial Loans [Line Items]
Interest Rate	4.83%	4.83%
Number of loans | loan	1	1
Principal value	$ 21,788	$ 22,102
30-89 Days DQ	0	0
90+ Days DQ	$ 0	$ 0
Commercial Loans Held-for-Investment, at Fair Value | Fixed Loans | Range 4
Commercial Loans [Line Items]
Interest Rate	4.79%	4.79%
Number of loans | loan	1	1
Principal value	$ 29,500	$ 29,500
30-89 Days DQ	0	0
90+ Days DQ	$ 0	$ 0
Commercial Loans Held For Sale
Commercial Loans [Line Items]
Number of loans | loan	4	13
Principal value	$ 39,000	$ 163,000
Commercial Loans Held For Sale | Fixed Loans
Commercial Loans [Line Items]
Interest Rate, minimum		4.19%
Interest Rate, maximum		4.79%
Number of loans | loan	4	13
Principal value	$ 38,750	$ 162,790
30-89 Days DQ	0	0
90+ Days DQ	$ 0	$ 0
Commercial Loans Held For Sale | Fixed Loans | Range 1
Commercial Loans [Line Items]
Interest Rate, minimum	4.81%
Interest Rate, maximum	4.81%
Number of loans | loan	1
Principal value	$ 4,150
30-89 Days DQ	0
90+ Days DQ	$ 0
Commercial Loans Held For Sale | Fixed Loans | Range 2
Commercial Loans [Line Items]
Interest Rate, minimum	5.05%
Interest Rate, maximum	5.05%
Number of loans | loan	2
Principal value	$ 16,900
30-89 Days DQ	0
90+ Days DQ	$ 0
Commercial Loans Held For Sale | Fixed Loans | Range 3
Commercial Loans [Line Items]
Interest Rate, minimum	4.90%
Interest Rate, maximum	4.90%
Number of loans | loan	1
Principal value	$ 17,700
30-89 Days DQ	0
90+ Days DQ	$ 0

X

- Definition

Commercial Loans [Line Items]

+ References

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Amount of principal due on commercial loans that have been delinquent thirty to eighty-nine days as of the balance sheet date.

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- Definition

The stated interest rate on the mortgage loan receivable or the weighted average interest rate on a group of loans.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 948
-SubTopic 310
-Section S99
-Paragraph 1
-Subparagraph (SX 210.12-29)
-URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 10
-Section S99
-Paragraph 6
-Subparagraph (SX 210.5-04.(c) Schedule IV)
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The highest stated interest rate within the mortgage loans included in the loan grouping.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 10
-Section S99
-Paragraph 6
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The lowest stated interest rate within the mortgage loans included in the loan grouping.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 948
-SubTopic 310
-Section S99
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Indicates the number of mortgages under each classification.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 948
-SubTopic 310
-Section S99
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Amount of principal due on loans that have been delinquent, which may exclude loans having interest delinquent for three months or less, as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 10
-Section S99
-Paragraph 6
-Subparagraph (SX 210.5-04.(c) Schedule IV)
-URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674

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This is the sum of principal amount outstanding for both securitized and unsecuritized loans of all types.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
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-Section 50
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