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Loans Receivables and Investments (Details) 2 - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Debt Securities, Available-for-sale $ 237,360 $ 206,442
Available-for-sale securities, unrealized gain (loss) 31,186 15,746
Non-mortgage loans receivable, net 63,724 54,164
Secured loans, unsecured loans, and other available-for-sale securities, amortized cost 974,510 740,729
Secured loans, unsecured loans, and other available-for-sale securities, fair value 1,006,889 742,191
Total loans receivable and investments, net 1,005,696 756,475
Non-Mortgage Loan Receivable    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Non-mortgage loans receivable, net 63,724 54,164
Non-mortgage loans receivable, amortized cost 63,724 54,164
Non-mortgage loans receivable, fair value 63,538 54,081
Non-mortgage loans receivable, net, unrealized gain 0 0
Commercial Mortgage Backed Securities    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Debt Securities, Held-to-maturity 645,546 439,491
Debt Securities, Held-to-maturity, Fair Value 646,925 425,290
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain 0 0
Government-sponsored pooled loan investments    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Debt Securities, Available-for-sale 59,066 56,378
Debt Securities, Available-for-sale, Amortized Cost 52,178 49,601
Available-for-sale securities, unrealized gain (loss) 6,888 6,777
Collateralized Mortgage Backed Securities    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Available-for-sale securities, unrealized gain (loss) 6,888 6,777
Debt securities, available-for-sale and held-to-maturity, carrying amount 704,612 495,869
Debt securities, available-for-sale and held-to-maturity, amortized cost 697,724 489,092
Debt securities, Held-to-Maturity and Available-for-Sale, Fair Value 705,991 481,668
Marketable Debt Securities    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Debt Securities, Available-for-sale 237,360 206,442
Debt Securities, Available-for-sale, Amortized Cost 213,062 197,473
Available-for-sale securities, unrealized gain (loss) $ 24,298 $ 8,969