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Allowance for Loan Losses and Credit Quality Indicators (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Allowance for Loan Losses        
Beginning balance $ 26,171 $ 26,482 $ 26,205 $ 26,482
Provision for loan losses 1,916 1,920 4,458 6,611
Charge-offs (2,613) (3,062) (5,787) (8,545)
Recoveries credited to allowance 361 1,067 959 1,859
Net charge-offs (2,252) (1,995) (4,828) (6,686)
Ending balance 25,835 26,407 25,835 26,407
Commercial [Member]
        
Allowance for Loan Losses        
Beginning balance 18,257 12,300 17,752 12,300
Provision for loan losses 436 7,393 1,735 10,258
Charge-offs (1,184) (2,157) (2,353) (5,324)
Recoveries credited to allowance 198 968 573 1,270
Net charge-offs (986) (1,189) (1,780) (4,054)
Ending balance 17,707 18,504 17,707 18,504
Consumer real estate loans [Member]
        
Allowance for Loan Losses        
Beginning balance 7,272 12,641 7,711 12,641
Provision for loan losses 1,289 (4,811) 2,475 (3,190)
Charge-offs (1,126) (712) (2,802) (2,541)
Recoveries credited to allowance 63 15 114 223
Net charge-offs (1,063) (697) (2,688) (2,318)
Ending balance 7,498 7,133 7,498 7,133
Consumer and other [Member]
        
Allowance for Loan Losses        
Beginning balance 642 1,541 742 1,541
Provision for loan losses 191 (662) 248 (457)
Charge-offs (303) (193) (632) (680)
Recoveries credited to allowance 100 84 272 366
Net charge-offs (203) (109) (360) (314)
Ending balance $ 630 $ 770 $ 630 $ 770