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Fair Value Measurements (Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis) (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Recurring Basis [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgage-backed securities $ 1,023,055 $ 1,275,631
Trading securities 5,706 4,677
Total 1,028,761 1,280,308
Recurring Basis [Member] | GSE [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgage-backed securities 905,126 1,180,455
Recurring Basis [Member] | Non-GSE [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgage-backed securities 5,100 7,776
Recurring Basis [Member] | GSE Bonds [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgage-backed securities 30,361  
Recurring Basis [Member] | Corporate Bonds [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgage-backed securities 80,279 74,402
Recurring Basis [Member] | Equities [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgage-backed securities 2,189 12,998
Nonrecurring [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans 27,950 36,479
Other real estate owned 664 870
Total 29,333 37,801
Level 1 [Member] | Recurring Basis [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgage-backed securities 2,189 12,998
Trading securities 5,706 4,677
Total 7,895 17,675
Level 1 [Member] | Recurring Basis [Member] | Equities [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgage-backed securities 2,189 12,998
Level 2 [Member] | Recurring Basis [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgage-backed securities 1,020,866 1,262,633
Total 1,020,866 1,262,633
Level 2 [Member] | Recurring Basis [Member] | GSE [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgage-backed securities 905,126 1,180,455
Level 2 [Member] | Recurring Basis [Member] | Non-GSE [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgage-backed securities 5,100 7,776
Level 2 [Member] | Recurring Basis [Member] | GSE Bonds [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgage-backed securities 30,361  
Level 2 [Member] | Recurring Basis [Member] | Corporate Bonds [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Mortgage-backed securities 80,279 74,402
Level 3 [Member] | Nonrecurring [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans 27,950 36,479
Other real estate owned 664 870
Total 29,333 37,801
Commercial Real Estate [Member] | Nonrecurring [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans 24,166 29,109
Commercial Real Estate [Member] | Level 3 [Member] | Nonrecurring [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans 24,166 29,109
One-to-Four Family Residential Mortgage [Member] | Nonrecurring [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans 340 1,827
One-to-Four Family Residential Mortgage [Member] | Level 3 [Member] | Nonrecurring [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans 340 1,827
Construction and Land [Member] | Nonrecurring [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans 108 2,070
Construction and Land [Member] | Level 3 [Member] | Nonrecurring [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans 108 2,070
Multi Family [Member] | Nonrecurring [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans 1,596 1,530
Multi Family [Member] | Level 3 [Member] | Nonrecurring [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans 1,596 1,530
Home Equity Line of Credit | Nonrecurring [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans 1,740 1,943
Home Equity Line of Credit | Level 3 [Member] | Nonrecurring [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Impaired loans 1,740 1,943
Commercial and Industrial [Member] | Nonrecurring [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Commercial and industrial loans 719 452
Commercial and Industrial [Member] | Level 3 [Member] | Nonrecurring [Member]
    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Commercial and industrial loans $ 719 $ 452