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Allowance for Loan Losses and Credit Quality Indicators (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
Allowance for Loan Losses        
Beginning balance $ 25,800 $ 26,482 $ 26,205 $ 26,482
Provision for loan losses 1,620 3,079 2,542 4,691
Loans charged off (1,612) (3,456) (4) (5,483)
Recoveries credited to allowance 363 377 598 792
Net charge-offs (1,249) (3,079) (2,576) (4,691)
Ending balance 26,171 26,482 26,171 26,482
Commercial [Member]
        
Allowance for Loan Losses        
Beginning balance 17,865 12,300 17,752 12,300
Provision for loan losses 950 2,504 1,216 2,865
Loans charged off (836) (2,727) (1,086) (3,167)
Recoveries credited to allowance 278 223 375 302
Net charge-offs (558) (2,504) (711) (2,865)
Ending balance 18,257 12,300 18,257 12,300
Consumer real estate [Member]
        
Allowance for Loan Losses        
Beginning balance 7,259 12,641 7,711 12,641
Provision for loan losses 623 408 1,237 1,621
Loans charged off (619) (457) (1,727) (1,829)
Recoveries credited to allowance 9 49 51 208
Net charge-offs (610) (408) (1,676) (1,621)
Ending balance 7,272 12,641 7,272 12,641
Consumer and other [Member]
        
Allowance for Loan Losses        
Beginning balance 676 1,541 742 1,541
Provision for loan losses 47 167 89 205
Loans charged off (157) (272) (361) (487)
Recoveries credited to allowance 76 105 172 282
Net charge-offs (81) (167) (189) (205)
Ending balance $ 642 $ 1,541 $ 642 $ 1,541