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Disclosures about fair value of assets and liabilities (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Fair value measurements of assets and liabilities recognized on a recurring basis    
Total available for sale securities, Fair Value $ 482,801 $ 431,045
Recurring basis [Member]
   
Fair value measurements of assets and liabilities recognized on a recurring basis    
Total available for sale securities, Fair Value 482,801 431,045
Recurring basis [Member] | Hedged loans [Member]
   
Fair value measurements of assets and liabilities recognized on a recurring basis    
Available-for-sale securities 81,018 54,362
Recurring basis [Member] | Forward sale commitments [Member]
   
Fair value measurements of assets and liabilities recognized on a recurring basis    
Available-for-sale securities 858 662
Recurring basis [Member] | Interest rate swap agreements [Member]
   
Fair value measurements of assets and liabilities recognized on a recurring basis    
Available-for-sale securities (7,707) (7,102)
Recurring basis [Member] | Commitments to originate loans [Member]
   
Fair value measurements of assets and liabilities recognized on a recurring basis    
Available-for-sale securities      
Recurring basis [Member] | U.S. Treasury and federal agencies [Member]
   
Fair value measurements of assets and liabilities recognized on a recurring basis    
Total available for sale securities, Fair Value 51,779 13,022
Recurring basis [Member] | State and municipal [Member]
   
Fair value measurements of assets and liabilities recognized on a recurring basis    
Total available for sale securities, Fair Value 172,905 143,890
Recurring basis [Member] | Federal agency collateralized mortgage obligations [Member]
   
Fair value measurements of assets and liabilities recognized on a recurring basis    
Total available for sale securities, Fair Value 96,831 91,122
Recurring basis [Member] | Federal agency mortgage-backed pools [Member]
   
Fair value measurements of assets and liabilities recognized on a recurring basis    
Total available for sale securities, Fair Value 159,204 179,351
Recurring basis [Member] | Private labeled mortgage-backed pools [Member]
   
Fair value measurements of assets and liabilities recognized on a recurring basis    
Total available for sale securities, Fair Value 2,031 3,636
Recurring basis [Member] | Corporate notes [Member]
   
Fair value measurements of assets and liabilities recognized on a recurring basis    
Total available for sale securities, Fair Value 51 24
Recurring basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
   
Fair value measurements of assets and liabilities recognized on a recurring basis    
Total available for sale securities, Fair Value      
Recurring basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Hedged loans [Member]
   
Fair value measurements of assets and liabilities recognized on a recurring basis    
Available-for-sale securities      
Recurring basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Forward sale commitments [Member]
   
Fair value measurements of assets and liabilities recognized on a recurring basis    
Available-for-sale securities      
Recurring basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Interest rate swap agreements [Member]
   
Fair value measurements of assets and liabilities recognized on a recurring basis    
Available-for-sale securities      
Recurring basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Commitments to originate loans [Member]
   
Fair value measurements of assets and liabilities recognized on a recurring basis    
Available-for-sale securities      
Recurring basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | U.S. Treasury and federal agencies [Member]
   
Fair value measurements of assets and liabilities recognized on a recurring basis    
Total available for sale securities, Fair Value      
Recurring basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | State and municipal [Member]
   
Fair value measurements of assets and liabilities recognized on a recurring basis    
Total available for sale securities, Fair Value      
Recurring basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Federal agency collateralized mortgage obligations [Member]
   
Fair value measurements of assets and liabilities recognized on a recurring basis    
Total available for sale securities, Fair Value      
Recurring basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Federal agency mortgage-backed pools [Member]
   
Fair value measurements of assets and liabilities recognized on a recurring basis    
Total available for sale securities, Fair Value      
Recurring basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Private labeled mortgage-backed pools [Member]
   
Fair value measurements of assets and liabilities recognized on a recurring basis    
Total available for sale securities, Fair Value      
Recurring basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Corporate notes [Member]
   
Fair value measurements of assets and liabilities recognized on a recurring basis    
Total available for sale securities, Fair Value      
Recurring basis [Member] | Significant Other Observable Inputs (Level 2) [Member]
   
Fair value measurements of assets and liabilities recognized on a recurring basis    
Total available for sale securities, Fair Value 482,801 431,045
Recurring basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Hedged loans [Member]
   
Fair value measurements of assets and liabilities recognized on a recurring basis    
Available-for-sale securities 81,018   
Recurring basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Forward sale commitments [Member]
   
Fair value measurements of assets and liabilities recognized on a recurring basis    
Available-for-sale securities 858   
Recurring basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Interest rate swap agreements [Member]
   
Fair value measurements of assets and liabilities recognized on a recurring basis    
Available-for-sale securities (7,707)   
Recurring basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Commitments to originate loans [Member]
   
Fair value measurements of assets and liabilities recognized on a recurring basis    
Available-for-sale securities      
Recurring basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | U.S. Treasury and federal agencies [Member]
   
Fair value measurements of assets and liabilities recognized on a recurring basis    
Total available for sale securities, Fair Value 51,779 13,022
Recurring basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | State and municipal [Member]
   
Fair value measurements of assets and liabilities recognized on a recurring basis    
Total available for sale securities, Fair Value 172,905 143,890
Recurring basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Federal agency collateralized mortgage obligations [Member]
   
Fair value measurements of assets and liabilities recognized on a recurring basis    
Total available for sale securities, Fair Value 96,831 91,122
Recurring basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Federal agency mortgage-backed pools [Member]
   
Fair value measurements of assets and liabilities recognized on a recurring basis    
Total available for sale securities, Fair Value 159,204 179,351
Recurring basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Private labeled mortgage-backed pools [Member]
   
Fair value measurements of assets and liabilities recognized on a recurring basis    
Total available for sale securities, Fair Value 2,031 3,636
Recurring basis [Member] | Significant Other Observable Inputs (Level 2) [Member] | Corporate notes [Member]
   
Fair value measurements of assets and liabilities recognized on a recurring basis    
Total available for sale securities, Fair Value 51 24
Recurring basis [Member] | Significant Unobservable Inputs (Level 3) [Member]
   
Fair value measurements of assets and liabilities recognized on a recurring basis    
Total available for sale securities, Fair Value      
Recurring basis [Member] | Significant Unobservable Inputs (Level 3) [Member] | Hedged loans [Member]
   
Fair value measurements of assets and liabilities recognized on a recurring basis    
Available-for-sale securities    54,362
Recurring basis [Member] | Significant Unobservable Inputs (Level 3) [Member] | Forward sale commitments [Member]
   
Fair value measurements of assets and liabilities recognized on a recurring basis    
Available-for-sale securities    662
Recurring basis [Member] | Significant Unobservable Inputs (Level 3) [Member] | Interest rate swap agreements [Member]
   
Fair value measurements of assets and liabilities recognized on a recurring basis    
Available-for-sale securities    (7,102)
Recurring basis [Member] | Significant Unobservable Inputs (Level 3) [Member] | Commitments to originate loans [Member]
   
Fair value measurements of assets and liabilities recognized on a recurring basis    
Available-for-sale securities      
Recurring basis [Member] | Significant Unobservable Inputs (Level 3) [Member] | U.S. Treasury and federal agencies [Member]
   
Fair value measurements of assets and liabilities recognized on a recurring basis    
Total available for sale securities, Fair Value      
Recurring basis [Member] | Significant Unobservable Inputs (Level 3) [Member] | State and municipal [Member]
   
Fair value measurements of assets and liabilities recognized on a recurring basis    
Total available for sale securities, Fair Value      
Recurring basis [Member] | Significant Unobservable Inputs (Level 3) [Member] | Federal agency collateralized mortgage obligations [Member]
   
Fair value measurements of assets and liabilities recognized on a recurring basis    
Total available for sale securities, Fair Value      
Recurring basis [Member] | Significant Unobservable Inputs (Level 3) [Member] | Federal agency mortgage-backed pools [Member]
   
Fair value measurements of assets and liabilities recognized on a recurring basis    
Total available for sale securities, Fair Value      
Recurring basis [Member] | Significant Unobservable Inputs (Level 3) [Member] | Private labeled mortgage-backed pools [Member]
   
Fair value measurements of assets and liabilities recognized on a recurring basis    
Total available for sale securities, Fair Value      
Recurring basis [Member] | Significant Unobservable Inputs (Level 3) [Member] | Corporate notes [Member]
   
Fair value measurements of assets and liabilities recognized on a recurring basis    
Total available for sale securities, Fair Value