Loans (Details 5) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Contract
Jun. 30, 2011
Contract
Jun. 30, 2012
Contract
Jun. 30, 2011
Contract
Summary of troubled debt restructurings        
Number of loans restructured 6 3 8 8
Pre-Modification Recorded Investment $ 473 $ 4,522 $ 628 $ 4,844
Post-Modification Recorded Investment 473 4,522 628 4,844
Financing receivables modifications subsequent default number of contracts 0 1 0 1
Financing receivables modifications pre modification recorded investment 1 0 90 0 90
Commercial [Member]
       
Summary of troubled debt restructurings        
Number of loans restructured       3
Pre-Modification Recorded Investment       4,445
Post-Modification Recorded Investment       4,445
Commercial real estate [Member]
       
Summary of troubled debt restructurings        
Number of loans restructured 1 2 1 1
Pre-Modification Recorded Investment 140 4,420 140 220
Post-Modification Recorded Investment 140 4,420 140 220
Residential real estate [Member]
       
Summary of troubled debt restructurings        
Number of loans restructured 5 1 7 4
Pre-Modification Recorded Investment 333 102 488 179
Post-Modification Recorded Investment $ 333 $ 102 $ 488 $ 179