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Loans Receivable and Allowance for Loan Losses (Residential Interest-Only Mortgage Loans, Amortization Period) (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Recorded Investment    
Total $ 11,469,608 $ 11,909,722
Residential Mortgage Loans | Interest-only loans    
Recorded Investment    
12 months or less 559,500  
13 to 24 months 377,632  
25 to 36 months 188,770  
Over 36 months 48,079  
Total $ 1,173,981