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LOANS - Investment Loan Activity (Details) $ in Thousands | 3 Months Ended
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Mar. 31, 2019 USD ($)
Mortgage Loans on Real Estate [Line Items] |  |
Beginning balance January 1, 2019 | $ 4,585,975 | [1],[2]
Purchases | 716,097 |
Sales and transfers | (1,357,997) |
Principal Payments | (66,755) |
Gains / (losses) | (1,243) |
Amortization / accretion | 3,247 |
Mortgage Loans on Real Estate | 3,879,324 | [2]
Residential |  |
Mortgage Loans on Real Estate [Line Items] |  |
Beginning balance January 1, 2019 | 1,359,806 |
Purchases | 425,488 |
Sales and transfers | (444,963) |
Principal Payments | (32,676) |
Gains / (losses) | 4,460 |
Amortization / accretion | (395) |
Mortgage Loans on Real Estate | 1,311,720 |
Commercial |  |
Mortgage Loans on Real Estate [Line Items] |  |
Beginning balance January 1, 2019 | 1,338,987 |
Purchases | 165,258 |
Sales and transfers | (733,922) |
Principal Payments | (534) |
Gains / (losses) | (5,703) |
Amortization / accretion | 911 |
Mortgage Loans on Real Estate | 764,997 |
Corporate |  |
Mortgage Loans on Real Estate [Line Items] |  |
Beginning balance January 1, 2019 | 1,887,182 |
Purchases | 125,351 |
Sales and transfers | (179,112) |
Principal Payments | (33,545) |
Gains / (losses) | 0 |
Amortization / accretion | 2,731 |
Mortgage Loans on Real Estate | $ 1,802,607 |
[1] | (1) Derived from the audited consolidated financial statements at December 31, 2018.
[2] | (4) Includes $101.3 million and $97.5 million of residential mortgage loans held for sale, $42.0 million and $42.2 million of commercial mortgage loans held for sale and $44.5 million and $0 of corporate loans held for sale at March 31, 2019 and December 31, 2018, respectively.

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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 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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