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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 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Mar. 31, 2017
Dec. 31, 2016
Mar. 31, 2016
Dec. 31, 2015
Financing Receivable, Allowance for Credit Losses [Line Items]                
Loans $ 1,169,452   $ 1,169,452     $ 1,463,003    
Less: Reserve for loan losses (78,789) $ (110,371) (78,789) $ (110,371) $ (79,389) (85,545) $ (109,671) $ (108,165)
Total 1,090,663   1,090,663     1,377,458    
Release of general reserve 0 $ 0 1,228 $ 0        
Interest receivable 5,700   5,700     6,900    
Held-to-maturity and available-for-sale securities 85,589   85,589     79,916    
Individually Evaluated for Impairment                
Financing Receivable, Allowance for Credit Losses [Line Items]                
Loans 249,659   249,659     253,941    
Less: Reserve for loan losses (60,989)   (60,989)     (62,245)    
Total 188,670   188,670     191,696    
Unamortized discounts, premiums, deferred fees and costs (700)   (700)     (400)    
Collectively Evaluated for Impairment                
Financing Receivable, Allowance for Credit Losses [Line Items]                
Loans 919,793   919,793     1,209,062    
Less: Reserve for loan losses (17,800)   (17,800)     (23,300)    
Total 901,993   901,993     1,185,762    
Unamortized discounts, premiums, deferred fees and costs $ 4,500   $ 4,500     $ 1,900