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Loans Receivable and Other Lending Investments, net - Investment in Loans and Associated Reserve for Loan Losses (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Jun. 30, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Dec. 31, 2017
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Recorded investment (comprised of a loans carrying value plus accrued interest) in loans and the associated reserve for loan losses |  |  |  |  |  |
Loans | $ 690,923 |  | $ 924,387 |  |  |
Less: Reserve for loan losses | (30,401) | $ (53,408) | (53,395) | $ (54,695) | $ (54,495) | $ (78,489)
Total | 660,522 |  | 870,992 |  |  |
Interest receivable | 4,200 |  | 4,900 |  |  |
Other lending investments that are evaluated for impairment | 44,200 |  |  |  |  |
Securities that are evaluated for impairment under ASC 320 | 107,695 |  | 122,126 |  |  |
Individually Evaluated for Impairment |  |  |  |  |  |
Recorded investment (comprised of a loans carrying value plus accrued interest) in loans and the associated reserve for loan losses |  |  |  |  |  |
Loans | 38,400 |  | 66,725 |  |  |
Less: Reserve for loan losses | (21,701) |  | (40,395) |  |  |
Total | 16,699 |  | 26,330 |  |  |
Unamortized discounts, premiums, deferred fees and costs, net discount | 100 |  | 500 |  |  |
Collectively Evaluated for Impairment |  |  |  |  |  |
Recorded investment (comprised of a loans carrying value plus accrued interest) in loans and the associated reserve for loan losses |  |  |  |  |  |
Loans | 652,523 |  | 857,662 |  |  |
Less: Reserve for loan losses | (8,700) |  | (13,000) |  |  |
Total | 643,823 |  | 844,662 |  |  |
Unamortized discounts, premiums, deferred fees and costs, net discount | $ 1,300 |  | $ 3,100 |  |  |

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- Definition Amount of investment in debt security measured at amortized cost (held-to-maturity) and investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References No definition available. + Details
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- Definition A valuation allowance for financing receivables that are expected to be uncollectible. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5074-111524 + Details
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- Definition Net amount of the investment in a contractual right to receive money on demand or on fixed or determinable dates that is recognized as an asset in the creditor's statement of financial position. Examples include, but are not limited to, credit card receivables, notes receivable and receivables relating to lessor's rights to payments from leases other than operating leases that have been recorded as assets. Excludes trade accounts receivable with contractual maturity of one year or less and arose from the sale of goods or services. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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