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Securities (Gross Unrealized Losses on Mortgage-Backed Securities (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]    
Unrealized losses, less than 12 months $ 13,304 $ 157
Estimated Fair value, less than 12 months 572,016 114,466
Unrealized losses, 12 months or more 852 37
Estimated Fair value, 12 months or more 54,365 8,237
Unrealized losses, total 14,156 194
Estimated fair value, total 626,381 122,703
Pass-through Certificates [Member] | GSE [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Unrealized losses, less than 12 months 3,493 99
Estimated Fair value, less than 12 months 156,702 14,156
Unrealized losses, 12 months or more 48  
Estimated Fair value, 12 months or more 5,375  
Unrealized losses, total 3,541 99
Estimated fair value, total 162,077 14,156
Real Estate Mortgage Investments Conduits (REMICs) [Member] | GSE [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Unrealized losses, less than 12 months 9,479 58
Estimated Fair value, less than 12 months 314,923 100,310
Unrealized losses, 12 months or more 775 4
Estimated Fair value, 12 months or more 48,508 7,633
Unrealized losses, total 10,254 62
Estimated fair value, total 363,431 107,943
Real Estate Mortgage Investments Conduits (REMICs) [Member] | Non-GSE [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Unrealized losses, less than 12 months 24  
Estimated Fair value, less than 12 months 1,246  
Unrealized losses, 12 months or more 29 33
Estimated Fair value, 12 months or more 482 604
Unrealized losses, total 53 33
Estimated fair value, total 1,728 604
Other Available For Sale Securities [Member] | Corporate Bonds [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Unrealized losses, less than 12 months 174  
Estimated Fair value, less than 12 months 68,784  
Unrealized losses, total 174  
Estimated fair value, total 68,784  
Other Available For Sale Securities [Member] | GSE Bonds [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Unrealized losses, less than 12 months 134  
Estimated Fair value, less than 12 months 30,361  
Unrealized losses, total 134  
Estimated fair value, total $ 30,361