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Loans and Investments - Nonaccrual Status Aging (Details) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2020 USD ($) loan | Jun. 30, 2019 loan | Jun. 30, 2020 USD ($) loan | Jun. 30, 2019 loan | Dec. 31, 2019 USD ($) loan
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Loans and investments, net | $ 4,800,176 |  | $ 4,800,176 |  | $ 4,189,960
Troubled debt restructurings, number | loan | 0 | 0 | 0 | 0 |
Interest Reserves |  |  |  |  |
Interest reserve held |  |  | $ 54,400 |  | $ 37,000
Number of loans covered under interest reserve | loan | 151 |  | 151 |  | 131
Aggregate UPB covered under interest reserve | $ 2,850,000 |  | $ 2,850,000 |  | $ 2,430,000
Greater than 90 Days Past Due |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Past Due | 0 |  | 0 |  | 0
Loans past due 90 days or more still accruing interest | $ 0 |  | $ 0 |  | $ 0

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- Definition Number of financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953676-111524 + Details
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- Definition Amount of financing receivable 90 days or more past due and still accruing. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 16 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919258-210447 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5111-111524 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 80 -URI http://asc.fasb.org/extlink&oid=121647567&loc=SL82922355-210448 + Details
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- Definition The balance represents the amount of loans that are secured by real estate mortgages, offset by the reserve to cover probable credit losses on the loan portfolio. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(c)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 + Details
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