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Loans Receivable and Other Lending Investments, net (Loans and Associated Reserve for Loan Losses) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
Financing Receivable, Allowance for Credit Losses [Line Items]        
Loans $ 1,435,251   $ 1,294,821  
Less: Reserve for loan losses (69,466) $ (79,389) (78,489) $ (85,545)
Total 1,365,785   1,216,332  
Release of general reserve 8,168 $ 1,228    
Interest receivable 6,000   5,300  
Held-to-maturity and available-for-sale securities 40,713   89,576  
Individually Evaluated for Impairment        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Loans 224,113   237,877  
Less: Reserve for loan losses (52,866)   (60,989)  
Total 171,247   176,888  
Unamortized discounts, premiums, deferred fees and costs, net (discount) or premium (700)   (700)  
Collectively Evaluated for Impairment        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Loans 1,211,138   1,056,944  
Less: Reserve for loan losses (16,600)   (17,500)  
Total 1,194,538   1,039,444  
Unamortized discounts, premiums, deferred fees and costs, net (discount) or premium $ 5,500   $ 6,200