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Schedule IV - Mortgage Loans on Real Estate (Details) | 12 Months Ended
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Dec. 31, 2017 USD ($) loan | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Mortgage Loans on Real Estate [Line Items] |  |  |
Carrying Value | $ 10,157,126,000 |  |
Principal Amount of Loans Subject to Delinquent Principal or Interest | 91,960,000 |  |
Reconciliation of Balance Sheet Reported Amounts of Mortgage Loans on Real Estate |  |  |
Beginning balance | 7,565,459,000 |  | $ 7,792,422,000
Additions during period: |  |  |
Purchases | 2,987,775,000 | $ 82,167,000 | 156,952,000
Accretion of purchase discount | 19,686,000 | 32,688,000 | 39,537,000
Deconsolidation | 0 | 0 | 1,483,000
Change in realized and unrealized gains (losses) | 10,214,000 | 10,794,000 | 0
Deductions during period: |  |  |
Repayments of principal | (175,664,000) | (175,216,000) | (130,651,000)
Collection of interest | (26,081,000) | (32,928,000) | (36,344,000)
Transfer to REO | (7,228,000) | (8,892,000) | (2,829,000)
Cost of mortgages sold | (176,470,000) | (96,344,000) | (1,241,266,000)
Provision for loan loss | 1,739,000 | 847,000 | (1,363,000)
Change in realized and unrealized gains (losses) | (270,000) | 0 | (59,262,000)
Amortization of premium | (42,034,000) | (40,079,000) | $ (41,083,000)
Balance at end of period | $ 10,157,126,000 | $ 7,565,459,000 |
First mortgage loans |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Number of Loans | loan | 28 |  |
Carrying Value | $ 7,268,000 |  |
Principal Amount of Loans Subject to Delinquent Principal or Interest | $ 2,851,000 |  |
First mortgage loans | Minimum |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Interest Rate | 2.63% |  |
First mortgage loans | Maximum |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Interest Rate | 15.00% |  |
Multifamily | First mortgage loans |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Number of Loans | loan | 495 |  |
Carrying Value | $ 9,657,421,000 |  |
Principal Amount of Loans Subject to Delinquent Principal or Interest | $ 0 |  |
Multifamily | First mortgage loans | Minimum |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Interest Rate | 3.04% |  |
Multifamily | First mortgage loans | Maximum |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Interest Rate | 6.18% |  |
Original loan amount $0 - $99,999 | Distressed residential mortgage loans |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Number of Loans | loan | 2,268 |  |
Carrying Value | $ 106,469,000 |  |
Principal Amount of Loans Subject to Delinquent Principal or Interest | $ 17,223,000 |  |
Original loan amount $0 - $99,999 | Distressed residential mortgage loans | Minimum |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Interest Rate | 1.99% |  |
Original loan amount $0 - $99,999 | Distressed residential mortgage loans | Maximum |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Interest Rate | 14.99% |  |
Original loan amount $0 - $99,999 | Residential mortgage loans held in securitization trusts |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Number of Loans | loan | 10 |  |
Carrying Value | $ 580,000 |  |
Principal Amount of Loans Subject to Delinquent Principal or Interest | $ 0 |  |
Original loan amount $0 - $99,999 | Residential mortgage loans held in securitization trusts | Minimum |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Interest Rate | 3.75% |  |
Original loan amount $0 - $99,999 | Residential mortgage loans held in securitization trusts | Maximum |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Interest Rate | 4.00% |  |
Original loan amount $0 - $99,999 | Single Family | First mortgage loans |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Number of Loans | loan | 35 |  |
Carrying Value | $ 1,777,000 |  |
Principal Amount of Loans Subject to Delinquent Principal or Interest | $ 85,000 |  |
Original loan amount $0 - $99,999 | Single Family | First mortgage loans | Minimum |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Interest Rate | 3.63% |  |
Original loan amount $0 - $99,999 | Single Family | First mortgage loans | Maximum |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Interest Rate | 14.59% |  |
Original loan amount $0 - $99,999 | Single Family | Second mortgage loans |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Number of Loans | loan | 652 |  |
Carrying Value | $ 32,209,000 |  |
Principal Amount of Loans Subject to Delinquent Principal or Interest | $ 64,000 |  |
Original loan amount $0 - $99,999 | Single Family | Second mortgage loans | Minimum |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Interest Rate | 5.88% |  |
Original loan amount $0 - $99,999 | Single Family | Second mortgage loans | Maximum |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Interest Rate | 8.75% |  |
Original loan amount $100,000 - $199,999 | Distressed residential mortgage loans |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Number of Loans | loan | 1,009 |  |
Carrying Value | $ 109,442,000 |  |
Principal Amount of Loans Subject to Delinquent Principal or Interest | $ 20,431,000 |  |
Original loan amount $100,000 - $199,999 | Distressed residential mortgage loans | Minimum |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Interest Rate | 1.75% |  |
Original loan amount $100,000 - $199,999 | Distressed residential mortgage loans | Maximum |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Interest Rate | 12.48% |  |
Original loan amount $100,000 - $199,999 | Residential mortgage loans held in securitization trusts |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Number of Loans | loan | 53 |  |
Carrying Value | $ 5,919,000 |  |
Principal Amount of Loans Subject to Delinquent Principal or Interest | $ 400,000 |  |
Original loan amount $100,000 - $199,999 | Residential mortgage loans held in securitization trusts | Minimum |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Interest Rate | 3.00% |  |
Original loan amount $100,000 - $199,999 | Residential mortgage loans held in securitization trusts | Maximum |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Interest Rate | 4.63% |  |
Original loan amount $100,000 - $199,999 | Single Family | First mortgage loans |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Number of Loans | loan | 74 |  |
Carrying Value | $ 8,552,000 |  |
Principal Amount of Loans Subject to Delinquent Principal or Interest | $ 565,000 |  |
Original loan amount $100,000 - $199,999 | Single Family | First mortgage loans | Minimum |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Interest Rate | 2.00% |  |
Original loan amount $100,000 - $199,999 | Single Family | First mortgage loans | Maximum |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Interest Rate | 9.00% |  |
Original loan amount $100,000 - $199,999 | Single Family | Second mortgage loans |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Number of Loans | loan | 90 |  |
Carrying Value | $ 12,222,000 |  |
Principal Amount of Loans Subject to Delinquent Principal or Interest | $ 0 |  |
Original loan amount $100,000 - $199,999 | Single Family | Second mortgage loans | Minimum |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Interest Rate | 6.00% |  |
Original loan amount $100,000 - $199,999 | Single Family | Second mortgage loans | Maximum |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Interest Rate | 9.00% |  |
Original loan amount $200,000 - $299,999 | Distressed residential mortgage loans |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Number of Loans | loan | 268 |  |
Carrying Value | $ 49,199,000 |  |
Principal Amount of Loans Subject to Delinquent Principal or Interest | $ 13,297,000 |  |
Original loan amount $200,000 - $299,999 | Distressed residential mortgage loans | Minimum |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Interest Rate | 0.00% |  |
Original loan amount $200,000 - $299,999 | Distressed residential mortgage loans | Maximum |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Interest Rate | 12.04% |  |
Original loan amount $200,000 - $299,999 | Residential mortgage loans held in securitization trusts |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Number of Loans | loan | 65 |  |
Carrying Value | $ 12,246,000 |  |
Principal Amount of Loans Subject to Delinquent Principal or Interest | $ 2,019,000 |  |
Original loan amount $200,000 - $299,999 | Residential mortgage loans held in securitization trusts | Minimum |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Interest Rate | 3.25% |  |
Original loan amount $200,000 - $299,999 | Residential mortgage loans held in securitization trusts | Maximum |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Interest Rate | 5.63% |  |
Original loan amount $200,000 - $299,999 | Single Family | First mortgage loans |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Number of Loans | loan | 49 |  |
Carrying Value | $ 9,684,000 |  |
Principal Amount of Loans Subject to Delinquent Principal or Interest | $ 500,000 |  |
Original loan amount $200,000 - $299,999 | Single Family | First mortgage loans | Minimum |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Interest Rate | 2.00% |  |
Original loan amount $200,000 - $299,999 | Single Family | First mortgage loans | Maximum |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Interest Rate | 9.25% |  |
Original loan amount $200,000 - $299,999 | Single Family | Second mortgage loans |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Number of Loans | loan | 22 |  |
Carrying Value | $ 5,144,000 |  |
Principal Amount of Loans Subject to Delinquent Principal or Interest | $ 0 |  |
Original loan amount $200,000 - $299,999 | Single Family | Second mortgage loans | Minimum |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Interest Rate | 6.25% |  |
Original loan amount $200,000 - $299,999 | Single Family | Second mortgage loans | Maximum |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Interest Rate | 9.00% |  |
Original loan amount over $299,999 | Distressed residential mortgage loans |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Number of Loans | loan | 184 |  |
Carrying Value | $ 66,354,000 |  |
Principal Amount of Loans Subject to Delinquent Principal or Interest | $ 20,625,000 |  |
Original loan amount over $299,999 | Distressed residential mortgage loans | Minimum |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Interest Rate | 0.75% |  |
Original loan amount over $299,999 | Distressed residential mortgage loans | Maximum |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Interest Rate | 9.40% |  |
Original loan amount over $299,999 | Single Family | First mortgage loans |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Number of Loans | loan | 43 |  |
Carrying Value | $ 16,901,000 |  |
Principal Amount of Loans Subject to Delinquent Principal or Interest | $ 0 |  |
Original loan amount over $299,999 | Single Family | First mortgage loans | Minimum |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Interest Rate | 2.13% |  |
Original loan amount over $299,999 | Single Family | First mortgage loans | Maximum |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Interest Rate | 6.85% |  |
Original loan amount over $299,999 | Single Family | Second mortgage loans |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Number of Loans | loan | 2 |  |
Carrying Value | $ 664,000 |  |
Principal Amount of Loans Subject to Delinquent Principal or Interest | $ 0 |  |
Original loan amount over $299,999 | Single Family | Second mortgage loans | Minimum |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Interest Rate | 6.88% |  |
Original loan amount over $299,999 | Single Family | Second mortgage loans | Maximum |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Interest Rate | 7.25% |  |
Original loan amount $300,000 - $399,999 | Residential mortgage loans held in securitization trusts |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Number of Loans | loan | 36 |  |
Carrying Value | $ 9,037,000 |  |
Principal Amount of Loans Subject to Delinquent Principal or Interest | $ 708,000 |  |
Original loan amount $300,000 - $399,999 | Residential mortgage loans held in securitization trusts | Minimum |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Interest Rate | 2.50% |  |
Original loan amount $300,000 - $399,999 | Residential mortgage loans held in securitization trusts | Maximum |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Interest Rate | 4.63% |  |
Original loan amount $400,000 - $499,999 | Residential mortgage loans held in securitization trusts |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Number of Loans | loan | 26 |  |
Carrying Value | $ 8,599,000 |  |
Principal Amount of Loans Subject to Delinquent Principal or Interest | $ 1,244,000 |  |
Original loan amount $400,000 - $499,999 | Residential mortgage loans held in securitization trusts | Minimum |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Interest Rate | 3.13% |  |
Original loan amount $400,000 - $499,999 | Residential mortgage loans held in securitization trusts | Maximum |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Interest Rate | 4.00% |  |
Original loan amount over $499,999 | Residential mortgage loans held in securitization trusts |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Number of Loans | loan | 50 |  |
Carrying Value | $ 37,439,000 |  |
Principal Amount of Loans Subject to Delinquent Principal or Interest | $ 11,948,000 |  |
Original loan amount over $499,999 | Residential mortgage loans held in securitization trusts | Minimum |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Interest Rate | 2.38% |  |
Original loan amount over $499,999 | Residential mortgage loans held in securitization trusts | Maximum |  |  |
Mortgage Loans on Real Estate [Line Items] |  |  |
Interest Rate | 4.13% |  |

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- Definition Mortgage Loans On Real Estate, Deconsolidation + References No definition available. + Details
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- Definition Mortgage Loans on Real Estate, Additions [Abstract] + References No definition available. + Details
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- Definition Mortgage Loans on Real Estate, Additions, Change in Realized and Unrealized Gains and (Losses) + References No definition available. + Details
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- Definition Mortgage Loans on Real Estate, Collections of Interest + References No definition available. + Details
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- Definition Mortgage Loans on Real Estate, Deductions, Change in Realized and Unrealized Gains and (Losses) + References No definition available. + Details
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- Definition Mortgage Loans on Real Estate, Provision for Loan Losses + References No definition available. + Details
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- Definition Total carrying amount of mortgage loans 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 210.12-29.6) -URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014 + Details
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- Definition Amount of decrease in mortgage loans on real estate from amortization of premium. + 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 210.12-29.6) -URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014 + Details
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- Definition The carrying amount of the outstanding balance due under the mortgage loan. + 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) -URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014 + Details
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- Definition The amount of principal collected on mortgage loans on real estate during the reporting period. + 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 210.12-29.6) -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 carrying amount of mortgage loans on real estate that were sold during the reporting period. + 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 210.12-29.6) -URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014 + Details
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- Definition The amount of mortgage loans on real estate which were foreclosed on during the reporting period. + 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 210.12-29.6) -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 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 Total amount of new mortgage loans on real estate during the reporting period. + 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 210.12-29.6) -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 A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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