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Securities (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Sep. 30, 2011
Fair value of securities      
Total available for sale investment securities, Amortized Cost $ 476,191 $ 414,067  
Gross Unrealized Gains 21,695 17,172  
Gross Unrealized Losses (182) (194)  
Available-for-sale Securities, Fair Value Disclosure 497,704 431,045  
Held-to-maturity, Amortized Cost 6,100 7,100  
Held-to-maturity, Fair Value 6,100 7,134  
U.S. Treasury and federal agencies [Member]
     
Fair value of securities      
Total available for sale investment securities, Amortized Cost 46,982 12,693  
Gross Unrealized Gains 394 329  
Gross Unrealized Losses        
Available-for-sale Securities, Fair Value Disclosure 47,376 13,022  
State and municipal [Member]
     
Fair value of securities      
Total available for sale investment securities, Amortized Cost 163,407 135,011  
Gross Unrealized Gains 11,476 8,950  
Gross Unrealized Losses (62) (71)  
Available-for-sale Securities, Fair Value Disclosure 174,821 143,890  
Held-to-maturity, Amortized Cost 6,100 7,100  
Held-to-maturity, Gross Unrealized Gains   34  
Federal agency collateralized mortgage obligations [Member]
     
Fair value of securities      
Total available for sale investment securities, Amortized Cost 97,534 89,016  
Gross Unrealized Gains 1,621 2,106  
Gross Unrealized Losses (114)    
Available-for-sale Securities, Fair Value Disclosure 99,041 91,122  
Federal agency mortgage-backed pools [Member]
     
Fair value of securities      
Total available for sale investment securities, Amortized Cost 166,029 173,797  
Gross Unrealized Gains 8,114 5,669  
Gross Unrealized Losses (6) (115)  
Available-for-sale Securities, Fair Value Disclosure 174,137 179,351  
Private labeled mortgage-backed pools [Member]
     
Fair value of securities      
Total available for sale investment securities, Amortized Cost 2,207 3,518  
Gross Unrealized Gains 81 118  
Gross Unrealized Losses        
Available-for-sale Securities, Fair Value Disclosure 2,288 3,636  
Corporate notes [Member]
     
Fair value of securities      
Total available for sale investment securities, Amortized Cost 32 32  
Gross Unrealized Gains 9    
Gross Unrealized Losses   (8)  
Available-for-sale Securities, Fair Value Disclosure $ 41 $ 24