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Investment Securities (Details 2) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Available-for-sale securities    
Due within one year, Amortized cost $ 14,567  
Due after one year but within five years, Amortized cost 16,957  
Due after five years but within ten years, Amortized cost 19,505  
Due after ten years, Amortized cost 165,264  
Amortized Cost 517,088 491,615
Due within one year, Fair value 14,580  
Due after one year but within five years, Fair value 17,592  
Due after five years but within ten years, Fair value 20,561  
Due after ten years, Fair value 159,271  
Fair Value 517,161 482,430
Held-to-maturity securities    
Due within one year, Amortized cost 60  
Due after one year but within five years, Amortized cost 756  
Due after five years but within ten years, Amortized cost     
Due after ten years, Amortized cost     
Total, Amortized Cost 816 3,490
Due within one year, Fair value 61  
Due after one year but within five years, Fair value 764  
Due after five years but within ten years, Fair value     
Due after ten years, Fair value     
Fair Value 825 3,532
Total Mortgage-backed securities [Member]
   
Available-for-sale securities    
Amortized Cost 295,239 290,364
Fair Value 299,495 290,132
Equity Securities [Member]
   
Available-for-sale securities    
Amortized Cost 5,556 419
Fair Value 5,662 521
Debt securities [Member]
   
Available-for-sale securities    
Total, Amortized cost 216,293  
Fair Value $ 212,004