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Residential Loans - Loan Product Type and Accompanying Loan Characteristics of Residential Loans (Detail) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 USD ($) loan | Dec. 31, 2014 USD ($) loan
Residential Loans Held for Investment |  |
Mortgage Loans on Real Estate [Line Items] |  |
Number of loans | loan | 4,545 | 5,315
Principal value | $ 1,122,415 | $ 1,483,213
30-89 Days DQ | 30,328 | 41,248
90+ Days DQ | $ 58,823 | $ 69,562
Residential Loans Held for Investment | ARM Loans |  |
Mortgage Loans on Real Estate [Line Items] |  |
Number of loans | loan | 4,504 | 5,063
Principal value | $ 1,101,588 | $ 1,311,514
30-89 Days DQ | 29,786 | 41,248
90+ Days DQ | 58,823 | 68,517
Residential Loans Held for Investment | ARM Loans | Range 1 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Loan Balance, minimum | 0 | 0
Loan Balance, maximum | $ 250 | $ 250
Interest Rate, minimum | 0.38% | 0.25%
Interest Rate, maximum | 5.16% | 5.50%
Number of loans | loan | 3,133 | 3,400
Principal value | $ 355,415 | $ 400,779
30-89 Days DQ | 10,661 | 14,604
90+ Days DQ | 13,078 | 16,332
Residential Loans Held for Investment | ARM Loans | Range 2 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Loan Balance, minimum | 251 | 251
Loan Balance, maximum | $ 500 | $ 500
Interest Rate, minimum | 0.00% | 0.00%
Interest Rate, maximum | 5.63% | 5.63%
Number of loans | loan | 858 | 1,041
Principal value | $ 296,425 | $ 360,848
30-89 Days DQ | 9,620 | 14,536
90+ Days DQ | 15,345 | 13,955
Residential Loans Held for Investment | ARM Loans | Range 3 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Loan Balance, minimum | 501 | 501
Loan Balance, maximum | $ 750 | $ 750
Interest Rate, minimum | 0.63% | 0.50%
Interest Rate, maximum | 4.66% | 4.66%
Number of loans | loan | 269 | 328
Principal value | $ 161,273 | $ 198,661
30-89 Days DQ | 4,578 | 7,218
90+ Days DQ | 7,209 | 12,862
Residential Loans Held for Investment | ARM Loans | Range 4 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Loan Balance, minimum | 751 | 751
Loan Balance, maximum | $ 1,000 | $ 1,000
Interest Rate, minimum | 0.38% | 0.25%
Interest Rate, maximum | 2.38% | 2.38%
Number of loans | loan | 135 | 162
Principal value | $ 118,983 | $ 143,687
30-89 Days DQ | 3,586 | 2,396
90+ Days DQ | $ 8,473 | $ 9,262
Residential Loans Held for Investment | ARM Loans | Range 5 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Loan Balance, minimum |  |
Loan Balance, maximum | $ 1,000 | $ 1,000
Interest Rate, minimum | 0.00% | 0.00%
Interest Rate, maximum | 2.63% | 2.63%
Number of loans | loan | 109 | 132
Principal value | $ 169,492 | $ 207,539
30-89 Days DQ | 1,341 | 2,494
90+ Days DQ | $ 14,718 | $ 16,106
Residential Loans Held for Investment | Hybrid ARM Loans |  |
Mortgage Loans on Real Estate [Line Items] |  |
Number of loans | loan | 41 | 70
Principal value | $ 20,827 | $ 46,310
90+ Days DQ | 0 | 319
Residential Loans Held for Investment | Hybrid ARM Loans | Range 1 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Loan Balance, minimum | 0 | 0
Loan Balance, maximum | $ 250 | $ 250
Interest Rate, minimum | 2.75% | 2.63%
Interest Rate, maximum | 2.88% | 2.63%
Number of loans | loan | 3 | 3
Principal value | $ 317 | $ 364
Residential Loans Held for Investment | Hybrid ARM Loans | Range 2 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Loan Balance, minimum | 251 | 251
Loan Balance, maximum | $ 500 | $ 500
Interest Rate, minimum | 2.63% | 2.50%
Interest Rate, maximum | 2.88% | 5.15%
Number of loans | loan | 20 | 26
Principal value | $ 7,523 | $ 10,056
90+ Days DQ | 0 | 319
Residential Loans Held for Investment | Hybrid ARM Loans | Range 3 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Loan Balance, minimum | 501 | 501
Loan Balance, maximum | $ 750 | $ 750
Interest Rate, minimum | 2.63% | 2.50%
Interest Rate, maximum | 2.88% | 4.65%
Number of loans | loan | 15 | 23
Principal value | $ 9,874 | $ 14,711
Residential Loans Held for Investment | Hybrid ARM Loans | Range 4 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Loan Balance, minimum | 751 | 751
Loan Balance, maximum | $ 1,000 | $ 1,000
Interest Rate, minimum | 2.75% | 2.50%
Interest Rate, maximum | 2.75% | 4.80%
Number of loans | loan | 2 | 11
Principal value | $ 1,547 | $ 9,393
Residential Loans Held for Investment | Hybrid ARM Loans | Range 5 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Loan Balance, minimum |  |
Loan Balance, maximum | $ 1,000 | $ 1,000
Interest Rate, minimum | 2.75% | 2.50%
Interest Rate, maximum | 2.75% | 4.95%
Number of loans | loan | 1 | 7
Principal value | $ 1,566 | $ 11,786
Residential Loans Held for Investment | Fixed Loans |  |
Mortgage Loans on Real Estate [Line Items] |  |
Number of loans | loan |  | 182
Principal value |  | $ 125,389
90+ Days DQ |  | 726
Residential Loans Held for Investment | Fixed Loans | Range 1 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Loan Balance, minimum |  | 0
Loan Balance, maximum |  | $ 250
Interest Rate, minimum |  | 3.70%
Interest Rate, maximum |  | 4.90%
Number of loans | loan |  | 7
Principal value |  | $ 1,040
Residential Loans Held for Investment | Fixed Loans | Range 2 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Loan Balance, minimum |  | 251
Loan Balance, maximum |  | $ 500
Interest Rate, minimum |  | 3.45%
Interest Rate, maximum |  | 5.13%
Number of loans | loan |  | 42
Principal value |  | $ 17,574
Residential Loans Held for Investment | Fixed Loans | Range 3 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Loan Balance, minimum |  | 501
Loan Balance, maximum |  | $ 750
Interest Rate, minimum |  | 3.65%
Interest Rate, maximum |  | 5.25%
Number of loans | loan |  | 71
Principal value |  | $ 42,609
Residential Loans Held for Investment | Fixed Loans | Range 4 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Loan Balance, minimum |  | 751
Loan Balance, maximum |  | $ 1,000
Interest Rate, minimum |  | 4.20%
Interest Rate, maximum |  | 5.25%
Number of loans | loan |  | 38
Principal value |  | $ 32,966
90+ Days DQ |  | $ 726
Residential Loans Held for Investment | Fixed Loans | Range 5 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Loan Balance, minimum |  |
Loan Balance, maximum |  | $ 1,000
Interest Rate, minimum |  | 4.30%
Interest Rate, maximum |  | 5.38%
Number of loans | loan |  | 24
Principal value |  | $ 31,200
Residential Loans Held For Sale |  |
Mortgage Loans on Real Estate [Line Items] |  |
Number of loans | loan | 1,772 | 2,282
Principal value | $ 1,091,518 | $ 1,305,493
30-89 Days DQ | 4,346 | 1,348
90+ Days DQ | 1,852 | 471
Residential Loans Held For Sale | ARM Loans |  |
Mortgage Loans on Real Estate [Line Items] |  |
Loan Balance, minimum | 64 | 66
Loan Balance, maximum | $ 1,298 | $ 359
Interest Rate, minimum | 1.50% | 1.88%
Interest Rate, maximum | 4.00% | 2.25%
Number of loans | loan | 14 | 8
Principal value | $ 5,258 | $ 1,286
30-89 Days DQ | 0 | 170
90+ Days DQ | 415 | 471
Residential Loans Held For Sale | Hybrid ARM Loans |  |
Mortgage Loans on Real Estate [Line Items] |  |
Loan Balance, minimum | 164 | 252
Loan Balance, maximum | $ 1,989 | $ 1,985
Interest Rate, minimum | 2.50% | 2.63%
Interest Rate, maximum | 4.25% | 4.00%
Number of loans | loan | 356 | 109
Principal value | $ 276,457 | $ 84,271
30-89 Days DQ | 2,249 |
Residential Loans Held For Sale | Fixed Loans |  |
Mortgage Loans on Real Estate [Line Items] |  |
Loan Balance, minimum | 30 | 75
Loan Balance, maximum | $ 2,332 | $ 2,496
Interest Rate, minimum | 2.75% | 2.88%
Interest Rate, maximum | 5.25% | 5.00%
Number of loans | loan | 1,402 | 2,165
Principal value | $ 809,803 | $ 1,219,936
30-89 Days DQ | 2,097 | $ 1,178
90+ Days DQ | $ 1,437 |
Residential Loans Held For Investment at Fair Value |  |
Mortgage Loans on Real Estate [Line Items] |  |
Number of loans | loan | 2,398 | 804
Principal value | $ 1,758,990 | $ 566,372
30-89 Days DQ | $ 5,357 | 2,137
Residential Loans Held For Investment at Fair Value | ARM Loans |  |
Mortgage Loans on Real Estate [Line Items] |  |
Number of loans | loan | 5 |
Principal value | $ 3,501 |
Residential Loans Held For Investment at Fair Value | ARM Loans | Range 1 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Loan Balance, minimum | 251 |
Loan Balance, maximum | $ 500 |
Interest Rate, minimum | 3.63% |
Interest Rate, maximum | 3.75% |
Number of loans | loan | 2 |
Principal value | $ 563 |
Residential Loans Held For Investment at Fair Value | ARM Loans | Range 2 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Loan Balance, minimum | 501 |
Loan Balance, maximum | $ 750 |
Interest Rate, minimum | 3.50% |
Interest Rate, maximum | 3.50% |
Number of loans | loan | 2 |
Principal value | $ 1,671 |
30-89 Days DQ | 0 |
Residential Loans Held For Investment at Fair Value | ARM Loans | Range 3 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Loan Balance, minimum | 751 |
Loan Balance, maximum | $ 1,000 |
Interest Rate, minimum | 3.63% |
Interest Rate, maximum | 3.63% |
Number of loans | loan | 1 |
Principal value | $ 1,267 |
Residential Loans Held For Investment at Fair Value | Hybrid ARM Loans |  |
Mortgage Loans on Real Estate [Line Items] |  |
30-89 Days DQ | 542 |
Residential Loans Held For Investment at Fair Value | Hybrid ARM Loans | Range 1 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Loan Balance, minimum | 251 | 251
Loan Balance, maximum | $ 500 | $ 500
Interest Rate, minimum | 2.88% | 2.38%
Interest Rate, maximum | 3.88% | 3.75%
Number of loans | loan | 7 | 29
Principal value | $ 2,963 | $ 12,487
30-89 Days DQ | 0 |
Residential Loans Held For Investment at Fair Value | Hybrid ARM Loans | Range 2 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Loan Balance, minimum | 501 | 501
Loan Balance, maximum | $ 750 | $ 750
Interest Rate, minimum | 2.63% | 2.38%
Interest Rate, maximum | 4.90% | 4.25%
Number of loans | loan | 28 | 80
Principal value | $ 17,514 | $ 49,085
30-89 Days DQ | 0 | 619
Residential Loans Held For Investment at Fair Value | Hybrid ARM Loans | Range 3 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Loan Balance, minimum | 751 | 751
Loan Balance, maximum | $ 1,000 | $ 1,000
Interest Rate, minimum | 2.75% | 2.38%
Interest Rate, maximum | 5.05% | 3.75%
Number of loans | loan | 15 | 51
Principal value | $ 12,994 | $ 43,835
30-89 Days DQ | 542 |
Residential Loans Held For Investment at Fair Value | Hybrid ARM Loans | Range 4 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Loan Balance, minimum |  |
Loan Balance, maximum | $ 1,000 | $ 1,000
Interest Rate, minimum | 2.88% | 2.38%
Interest Rate, maximum | 5.20% | 3.25%
Number of loans | loan | 6 | 14
Principal value | $ 8,797 | $ 17,720
30-89 Days DQ | $ 0 |
Residential Loans Held For Investment at Fair Value | Hybrid ARM Loans | Range 5 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Number of loans | loan | 56 | 174
Principal value | $ 42,268 | $ 123,127
30-89 Days DQ | $ 0 | $ 619
Residential Loans Held For Investment at Fair Value | Fixed Loans |  |
Mortgage Loans on Real Estate [Line Items] |  |
Number of loans | loan | 2,337 | 630
Principal value | $ 1,713,221 | $ 443,245
30-89 Days DQ | 5,357 | 1,518
Residential Loans Held For Investment at Fair Value | Fixed Loans | Range 1 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Loan Balance, minimum | 0 | 0
Loan Balance, maximum | $ 250 | $ 250
Interest Rate, minimum | 3.64% | 4.13%
Interest Rate, maximum | 5.38% | 4.13%
Number of loans | loan | 29 | 1
Principal value | $ 5,295 | $ 75
30-89 Days DQ | 242 |
Residential Loans Held For Investment at Fair Value | Fixed Loans | Range 2 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Loan Balance, minimum | 251 | 251
Loan Balance, maximum | $ 500 | $ 500
Interest Rate, minimum | 3.13% | 3.13%
Interest Rate, maximum | 5.13% | 4.75%
Number of loans | loan | 484 | 158
Principal value | $ 212,732 | $ 72,931
30-89 Days DQ | 913 | 894
Residential Loans Held For Investment at Fair Value | Fixed Loans | Range 3 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Loan Balance, minimum | 501 | 501
Loan Balance, maximum | $ 750 | $ 750
Interest Rate, minimum | 2.94% | 3.13%
Interest Rate, maximum | 5.25% | 5.00%
Number of loans | loan | 959 | 272
Principal value | $ 595,863 | $ 165,574
30-89 Days DQ | 3,213 | 624
Residential Loans Held For Investment at Fair Value | Fixed Loans | Range 4 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Loan Balance, minimum | 751 | 751
Loan Balance, maximum | $ 1,000 | $ 1,000
Interest Rate, minimum | 2.90% | 3.13%
Interest Rate, maximum | 5.00% | 4.88%
Number of loans | loan | 552 | 136
Principal value | $ 480,557 | $ 116,892
30-89 Days DQ | $ 989 |
Residential Loans Held For Investment at Fair Value | Fixed Loans | Range 5 |  |
Mortgage Loans on Real Estate [Line Items] |  |
Loan Balance, minimum |  |
Loan Balance, maximum | $ 1,000 | $ 1,000
Interest Rate, minimum | 3.14% | 3.25%
Interest Rate, maximum | 5.00% | 5.00%
Number of loans | loan | 313 | 63
Principal value | $ 418,774 | $ 87,773
30-89 Days DQ | $ 0 |

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- Definition Amount of principal due on 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 Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + 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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