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Loans, Allowance for Loan Losses and Recorded Investments (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 [Roll Forward]        
Beginning balance $ 33,172 $ 35,152 $ 33,171 $ 34,805
Provision charged to expense 2,425 3,320 3,585 7,707
Losses charged off 3,207 4,066 5,333 8,728
Recoveries 744 746 1,711 1,368
Ending balance 33,134 35,152 33,134 35,152
Loans Ending balance: [Abstract]        
Individually evaluated for impairment 3,329 5,619 3,329 5,619
Collectively evaluated for impairment 29,805 29,533 29,805 29,533
Loans Ending balance: [Abstract]        
Individually evaluated for impairment 64,448 65,060 64,448 65,060
Collectively evaluated for impairment 2,482,988 2,515,427 2,482,988 2,515,427
Commercial Construction [Member]
        
Allowance for loan losses [Roll Forward]        
Beginning balance 4,066 4,668 4,023 4,332
Provision charged to expense 209 363 251 796
Losses charged off 457 406 475 504
Recoveries 113 12 132 13
Ending balance 3,931 4,637 3,931 4,637
Loans Ending balance: [Abstract]        
Individually evaluated for impairment 1,823 2,724 1,823 2,724
Collectively evaluated for impairment 2,108 1,913 2,108 1,913
Loans Ending balance: [Abstract]        
Individually evaluated for impairment 12,115 21,439 12,115 21,439
Collectively evaluated for impairment 103,852 105,189 103,852 105,189
Commercial Secured By Real Estate [Member]
        
Allowance for loan losses [Roll Forward]        
Beginning balance 12,977 11,952 11,753 12,327
Provision charged to expense 1,170 1,379 2,450 2,992
Losses charged off 891 198 987 2,213
Recoveries 6 69 46 96
Ending balance 13,262 13,202 13,262 13,202
Loans Ending balance: [Abstract]        
Individually evaluated for impairment 1,084 1,977 1,084 1,977
Collectively evaluated for impairment 12,178 11,225 12,178 11,225
Loans Ending balance: [Abstract]        
Individually evaluated for impairment 38,892 37,267 38,892 37,267
Collectively evaluated for impairment 775,733 768,371 775,733 768,371
Commercial Other [Member]
        
Allowance for loan losses [Roll Forward]        
Beginning balance 5,965 7,504 5,608 7,392
Provision charged to expense 207 (233) 925 673
Losses charged off 783 1,960 1,395 2,835
Recoveries 98 141 349 222
Ending balance 5,487 5,452 5,487 5,452
Loans Ending balance: [Abstract]        
Individually evaluated for impairment 422 918 422 918
Collectively evaluated for impairment 5,065 4,534 5,065 4,534
Loans Ending balance: [Abstract]        
Individually evaluated for impairment 13,164 6,045 13,164 6,045
Collectively evaluated for impairment 368,473 376,165 368,473 376,165
Equipment Lease Financing [Member]
        
Allowance for loan losses [Roll Forward]        
Beginning balance 105 138 112 148
Provision charged to expense 37 (15) 30 (25)
Losses charged off 0 0 0 0
Recoveries 0 0 0 0
Ending balance 142 123 142 123
Loans Ending balance: [Abstract]        
Individually evaluated for impairment 0 0 0 0
Collectively evaluated for impairment 142 123 142 123
Loans Ending balance: [Abstract]        
Individually evaluated for impairment 0 0 0 0
Collectively evaluated for impairment 10,714 10,365 10,714 10,365
Real Estate Construction [Member]
        
Allowance for loan losses [Roll Forward]        
Beginning balance 344 262 354 271
Provision charged to expense 42 103 197 86
Losses charged off 0 75 171 75
Recoveries 4 6 10 14
Ending balance 390 296 390 296
Loans Ending balance: [Abstract]        
Individually evaluated for impairment 0 0 0 0
Collectively evaluated for impairment 390 296 390 296
Loans Ending balance: [Abstract]        
Individually evaluated for impairment 0 28 0 28
Collectively evaluated for impairment 56,451 48,167 56,451 48,167
Real Estate Mortgage [Member]
        
Allowance for loan losses [Roll Forward]        
Beginning balance 4,240 3,345 4,302 2,982
Provision charged to expense 414 872 485 1,555
Losses charged off 232 309 422 651
Recoveries 50 30 107 52
Ending balance 4,472 3,938 4,472 3,938
Loans Ending balance: [Abstract]        
Individually evaluated for impairment 0 0 0 0
Collectively evaluated for impairment 4,472 3,938 4,472 3,938
Loans Ending balance: [Abstract]        
Individually evaluated for impairment 277 84 277 84
Collectively evaluated for impairment 647,557 641,081 647,557 641,081
Home Equity [Member]
        
Allowance for loan losses [Roll Forward]        
Beginning balance 546 439 562 407
Provision charged to expense 64 148 93 226
Losses charged off 36 81 82 127
Recoveries 0 8 1 8
Ending balance 574 514 574 514
Loans Ending balance: [Abstract]        
Individually evaluated for impairment 0 0 0 0
Collectively evaluated for impairment 574 514 574 514
Loans Ending balance: [Abstract]        
Individually evaluated for impairment 0 0 0 0
Collectively evaluated for impairment 83,101 83,727 83,101 83,727
Consumer Direct [Member]
        
Allowance for loan losses [Roll Forward]        
Beginning balance 846 1,061 917 1,169
Provision charged to expense 69 33 (48) 76
Losses charged off 203 118 349 409
Recoveries 145 91 337 231
Ending balance 857 1,067 857 1,067
Loans Ending balance: [Abstract]        
Individually evaluated for impairment 0 0 0 0
Collectively evaluated for impairment 857 1,067 857 1,067
Loans Ending balance: [Abstract]        
Individually evaluated for impairment 0 111 0 111
Collectively evaluated for impairment 124,946 122,969 124,946 122,969
Consumer Indirect [Member]
        
Allowance for loan losses [Roll Forward]        
Beginning balance 4,083 5,783 5,540 5,777
Provision charged to expense 213 670 (798) 1,328
Losses charged off 605 919 1,452 1,914
Recoveries 328 389 729 732
Ending balance 4,019 5,923 4,019 5,923
Loans Ending balance: [Abstract]        
Individually evaluated for impairment 0 0 0 0
Collectively evaluated for impairment 4,019 5,923 4,019 5,923
Loans Ending balance: [Abstract]        
Individually evaluated for impairment 0 86 0 86
Collectively evaluated for impairment $ 312,161 $ 359,393 $ 312,161 $ 359,393