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Loans Receivable and Allowance for Loan Losses (Residential Interest-Only Mortgage Loans, Amortization Period) (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Recorded Investment    
Total $ 11,210,370 $ 11,909,722
Residential Mortgage Loans | Interest-only loans    
Recorded Investment    
12 months or less 416,082  
13 to 24 months 388,670  
25 to 36 months 94,985  
Over 36 months 32,926  
Total $ 932,663