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Loans Receivable and Allowance for Loan Losses (Residential Interest-Only Mortgage Loans, Amortization Period) (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Amortization scheduled to begin in:    
Total $ 10,800,918 $ 11,111,727
Residential Mortgage Loans | Interest-only loans    
Amortization scheduled to begin in:    
12 months or less 322,891  
13 to 24 months 162,300  
25 to 36 months 16,391  
Over 36 months 17,852  
Total $ 519,434