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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 |

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- Definition Amount of principal due on commercial loans that have been delinquent thirty to eighty-nine days as of the balance sheet date. + References No definition available. + Details
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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 Reference 2: 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 + Details
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- Definition 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 -Subparagraph (SX 210.5-04.(c) Schedule IV) -URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29.3) -URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014 + Details
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- Definition The lowest 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 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29.3) -URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014 Reference 2: 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 + Details
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- Definition 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 -Paragraph 1 -Subparagraph (SX 210.12-29.3) -URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014 Reference 2: 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 + Details
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- Definition 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29.10(a)) -URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014 + Details
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- Definition 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 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=51814546&loc=d3e107314-111719 + Details
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