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Loans Receivable and Allowance for Loan Losses (Multi-Family and Commercial Real Estate Loans, by Credit Quality Indicator) (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Balances of multi-family and commercial real estate mortgage loan receivable segments by credit quality indicator    
Total $ 11,210,370 $ 11,909,722
Mortgage loans (gross)    
Balances of multi-family and commercial real estate mortgage loan receivable segments by credit quality indicator    
Total 10,961,716 11,660,354
Mortgage loans (gross) | Multi-family    
Balances of multi-family and commercial real estate mortgage loan receivable segments by credit quality indicator    
Total 3,908,768 3,913,053
Mortgage loans (gross) | Multi-family | Not criticized    
Balances of multi-family and commercial real estate mortgage loan receivable segments by credit quality indicator    
Total 3,866,033 3,850,068
Mortgage loans (gross) | Multi-family | Special mention    
Balances of multi-family and commercial real estate mortgage loan receivable segments by credit quality indicator    
Total 18,965 30,975
Mortgage loans (gross) | Multi-family | Substandard    
Balances of multi-family and commercial real estate mortgage loan receivable segments by credit quality indicator    
Total 23,770 31,264
Mortgage loans (gross) | Multi-family | Doubtful    
Balances of multi-family and commercial real estate mortgage loan receivable segments by credit quality indicator    
Total 0 746
Mortgage loans (gross) | Commercial real estate    
Balances of multi-family and commercial real estate mortgage loan receivable segments by credit quality indicator    
Total 825,481 873,765
Mortgage loans (gross) | Commercial real estate | Not criticized    
Balances of multi-family and commercial real estate mortgage loan receivable segments by credit quality indicator    
Total 775,666 817,404
Mortgage loans (gross) | Commercial real estate | Special mention    
Balances of multi-family and commercial real estate mortgage loan receivable segments by credit quality indicator    
Total 17,492 22,584
Mortgage loans (gross) | Commercial real estate | Substandard    
Balances of multi-family and commercial real estate mortgage loan receivable segments by credit quality indicator    
Total 31,238 32,664
Mortgage loans (gross) | Commercial real estate | Doubtful    
Balances of multi-family and commercial real estate mortgage loan receivable segments by credit quality indicator    
Total $ 1,085 $ 1,113