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Loans, Allowance for Loan Losses and Recorded Investments (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 [Roll Forward]        
Beginning balance $ 33,134 $ 35,152 $ 33,171 $ 34,805
Provision charged to expense 2,919 2,515 6,504 10,222
Losses charged off 3,664 3,360 8,997 12,088
Recoveries 800 692 2,511 2,060
Ending balance 33,189 34,999 33,189 34,999
Allowance for Loan Losses Ending balance: [Abstract]        
Individually evaluated for impairment 3,574 6,305 3,574 6,305
Collectively evaluated for impairment 29,615 28,694 29,615 28,694
Loans Ending balance: [Abstract]        
Individually evaluated for impairment 60,891 56,021 60,891 56,021
Collectively evaluated for impairment 2,490,646 2,517,536 2,490,646 2,517,536
Commercial Construction [Member]
        
Allowance for loan losses [Roll Forward]        
Beginning balance 3,931 4,637 4,023 4,332
Provision charged to expense 1,249 1,162 1,500 1,958
Losses charged off 787 304 1,262 808
Recoveries 67 16 199 29
Ending balance 4,460 5,511 4,460 5,511
Allowance for Loan Losses Ending balance: [Abstract]        
Individually evaluated for impairment 2,321 3,714 2,321 3,714
Collectively evaluated for impairment 2,139 1,797 2,139 1,797
Loans Ending balance: [Abstract]        
Individually evaluated for impairment 10,102 14,995 10,102 14,995
Collectively evaluated for impairment 104,989 106,147 104,989 106,147
Commercial Secured By Real Estate [Member]
        
Allowance for loan losses [Roll Forward]        
Beginning balance 13,262 13,202 11,753 12,327
Provision charged to expense 698 (134) 3,148 2,858
Losses charged off 658 369 1,645 2,582
Recoveries 87 27 133 123
Ending balance 13,389 12,726 13,389 12,726
Allowance for Loan Losses Ending balance: [Abstract]        
Individually evaluated for impairment 938 1,826 938 1,826
Collectively evaluated for impairment 12,451 10,900 12,451 10,900
Loans Ending balance: [Abstract]        
Individually evaluated for impairment 37,505 35,927 37,505 35,927
Collectively evaluated for impairment 783,420 770,251 783,420 770,251
Commercial Other [Member]
        
Allowance for loan losses [Roll Forward]        
Beginning balance 5,487 5,452 5,608 7,392
Provision charged to expense 529 366 1,454 1,039
Losses charged off 766 856 2,161 3,691
Recoveries 184 127 533 349
Ending balance 5,434 5,089 5,434 5,089
Allowance for Loan Losses Ending balance: [Abstract]        
Individually evaluated for impairment 315 765 315 765
Collectively evaluated for impairment 5,119 4,324 5,119 4,324
Loans Ending balance: [Abstract]        
Individually evaluated for impairment 12,618 4,789 12,618 4,789
Collectively evaluated for impairment 366,690 372,101 366,690 372,101
Equipment Lease Financing [Member]
        
Allowance for loan losses [Roll Forward]        
Beginning balance 142 123 112 148
Provision charged to expense (5) 0 25 (25)
Losses charged off 0 0 0 0
Recoveries 0 0 0 0
Ending balance 137 123 137 123
Allowance for Loan Losses Ending balance: [Abstract]        
Individually evaluated for impairment 0 0 0 0
Collectively evaluated for impairment 137 123 137 123
Loans Ending balance: [Abstract]        
Individually evaluated for impairment 0 0 0 0
Collectively evaluated for impairment 10,167 10,765 10,167 10,765
Real Estate Construction [Member]
        
Allowance for loan losses [Roll Forward]        
Beginning balance 390 296 354 271
Provision charged to expense (8) 261 189 347
Losses charged off 18 244 189 319
Recoveries 3 6 13 20
Ending balance 367 319 367 319
Allowance for Loan Losses Ending balance: [Abstract]        
Individually evaluated for impairment 0 0 0 0
Collectively evaluated for impairment 367 319 367 319
Loans Ending balance: [Abstract]        
Individually evaluated for impairment 0 28 0 28
Collectively evaluated for impairment 54,431 50,422 54,431 50,422
Real Estate Mortgage [Member]
        
Allowance for loan losses [Roll Forward]        
Beginning balance 4,472 3,938 4,302 2,982
Provision charged to expense 407 692 892 2,247
Losses charged off 411 566 833 1,217
Recoveries 17 17 124 69
Ending balance 4,485 4,081 4,485 4,081
Allowance for Loan Losses Ending balance: [Abstract]        
Individually evaluated for impairment 0 0 0 0
Collectively evaluated for impairment 4,485 4,081 4,485 4,081
Loans Ending balance: [Abstract]        
Individually evaluated for impairment 666 83 666 83
Collectively evaluated for impairment 663,663 644,696 663,663 644,696
Home Equity [Member]
        
Allowance for loan losses [Roll Forward]        
Beginning balance 574 514 562 407
Provision charged to expense 26 56 119 282
Losses charged off 41 44 123 171
Recoveries 0 7 1 15
Ending balance 559 533 559 533
Allowance for Loan Losses Ending balance: [Abstract]        
Individually evaluated for impairment 0 0 0 0
Collectively evaluated for impairment 559 533 559 533
Loans Ending balance: [Abstract]        
Individually evaluated for impairment 0 0 0 0
Collectively evaluated for impairment 82,724 84,173 82,724 84,173
Consumer Direct [Member]
        
Allowance for loan losses [Roll Forward]        
Beginning balance 857 1,067 917 1,169
Provision charged to expense (19) (6) (67) 70
Losses charged off 173 261 522 670
Recoveries 122 141 459 372
Ending balance 787 941 787 941
Allowance for Loan Losses Ending balance: [Abstract]        
Individually evaluated for impairment 0 0 0 0
Collectively evaluated for impairment 787 941 787 941
Loans Ending balance: [Abstract]        
Individually evaluated for impairment 0 78 0 78
Collectively evaluated for impairment 126,005 124,363 126,005 124,363
Consumer Indirect [Member]
        
Allowance for loan losses [Roll Forward]        
Beginning balance 4,019 5,923 5,540 5,777
Provision charged to expense 42 118 (756) 1,446
Losses charged off 810 716 2,262 2,630
Recoveries 320 351 1,049 1,083
Ending balance 3,571 5,676 3,571 5,676
Allowance for Loan Losses Ending balance: [Abstract]        
Individually evaluated for impairment 0 0 0 0
Collectively evaluated for impairment 3,571 5,676 3,571 5,676
Loans Ending balance: [Abstract]        
Individually evaluated for impairment 0 121 0 121
Collectively evaluated for impairment $ 298,557 $ 354,618 $ 298,557 $ 354,618