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Securities Available for Sale - Amortized Cost and Estimated Fair Value (Details) (USD $)
Sep. 30, 2012
Dec. 31, 2011
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost - Due within one year $ 0  
Amortized Cost - Due after one year through five years 340,000  
Amortized Cost - Due after five years through ten years 3,883,000  
Amortized Cost - Due after ten years 4,781,000  
Amortized Cost 669,020,000 725,754,000
Estimated Fair Value - Due within one year 0  
Estimated Fair Value - Due after one year through five years 358,000  
Estimated Fair Value - Due after five years through ten years 4,451,000  
Estimated Fair Value - Due after ten years 3,867,000  
Estimated Fair Value 687,059,000 740,920,000
Available-for-sale Securities, Restricted 348,900,000 425,500,000
GSE collateralized mortgage obligations
   
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 230,819,000  
Amortized Cost 230,819,000 [1] 222,400,000 [1]
Estimated Fair Value 235,669,000  
Estimated Fair Value 235,669,000 [1] 227,836,000 [1]
GSE mortgage-backed securities
   
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 414,487,000  
Amortized Cost 414,487,000 [1] 477,555,000 [1]
Estimated Fair Value 427,589,000  
Estimated Fair Value 427,589,000 [1] 487,754,000 [1]
Mutual funds - GSE mortgage related securities
   
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 14,710,000 14,710,000
Estimated Fair Value $ 15,125,000 $ 14,918,000
[1] Government Sponsored Enterprises (GSE) investments were issued by GNMA, FNMA and FHLMC and are all residential mortgage-backed investments