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Allowance For Loan Losses (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Sep. 30, 2011
Rollforward of the allowance for loan losses by portfolio segment          
Balance at beginning of period $ 13,778 $ 18,025 $ 14,623 $ 19,765   
Charge-offs (237) (349) (544) (1,730)  
Recoveries 276 457 363 698  
Provision (credit) for loan losses (500) (1,175) (1,125) (1,775)  
Balance at end of period 13,317 16,958 13,317 16,958   
Commercial [Member]
          
Rollforward of the allowance for loan losses by portfolio segment          
Balance at beginning of period 2,483 5,687 2,365 3,851  
Charge-offs   (243) (99) (942)  
Recoveries 90 364 112 524  
Provision (credit) for loan losses (221) (1,254) (26) 1,121  
Balance at end of period 2,352 4,554 2,352 4,554  
Commercial loans secured by real estate [Member]
          
Rollforward of the allowance for loan losses by portfolio segment          
Balance at beginning of period 8,555 9,108 9,400 12,717   
Charge-offs (31)   (172) (638)  
Recoveries 170 65 200 66  
Provision (credit) for loan losses (316) 54 (1,050) (2,918)  
Balance at end of period 8,378 9,227 8,378 9,227   
Real estate-mortgage [Member]
          
Rollforward of the allowance for loan losses by portfolio segment          
Balance at beginning of period 1,250 1,250 1,270 1,117   
Charge-offs (99) (29) (139) (40)  
Recoveries 5 2 29 26  
Provision (credit) for loan losses 50 71 46 191  
Balance at end of period 1,206 1,294 1,206 1,294   
Consumer [Member]
          
Rollforward of the allowance for loan losses by portfolio segment          
Balance at beginning of period 166 198 174 206   
Charge-offs (107) (77) (134) (110)  
Recoveries 11 26 22 82  
Provision (credit) for loan losses 85 46 93 15  
Balance at end of period 155 193 155 193   
Allocation for General Risk [Member]
          
Rollforward of the allowance for loan losses by portfolio segment          
Balance at beginning of period 1,324 1,782 1,414 1,874   
Charge-offs           
Recoveries           
Provision (credit) for loan losses (98) (92) (188) (184)  
Balance at end of period $ 1,226 $ 1,690 $ 1,226 $ 1,690