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Allowance for Loan and Lease Losses (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Allowance for loan losses [Roll Forward]          
Beginning balance $ 33,601 $ 33,134 $ 33,245 $ 33,171 $ 33,171
Provision charged to expense 2,129 2,919 7,349 6,504 9,450
Losses charged off 2,519 3,664 8,822 8,997 12,590
Recoveries 802 800 2,241 2,511 3,214
Ending balance 34,013 33,189 34,013 33,189 33,245
Allowance for Loan Losses Ending balance: [Abstract]          
Individually evaluated for impairment 3,280 3,574 3,280 3,574 3,248
Collectively evaluated for impairment 30,733 29,615 30,733 29,615 29,997
Loans Ending balance: [Abstract]          
Individually evaluated for impairment 63,292 60,891 63,292 60,891 62,498
Collectively evaluated for impairment 2,553,073 2,490,646 2,553,073 2,490,646 2,488,075
Commercial Construction [Member]
          
Allowance for loan losses [Roll Forward]          
Beginning balance 3,835 3,931 4,033 4,023 4,023
Provision charged to expense (101) 1,249 806 1,500 1,009
Losses charged off 0 787 1,112 1,262 1,034
Recoveries 151 67 158 199 35
Ending balance 3,885 4,460 3,885 4,460 4,033
Allowance for Loan Losses Ending balance: [Abstract]          
Individually evaluated for impairment 1,827 2,321 1,827 2,321 1,820
Collectively evaluated for impairment 2,058 2,139 2,058 2,139 2,213
Loans Ending balance: [Abstract]          
Individually evaluated for impairment 10,143 10,102 10,143 10,102 9,395
Collectively evaluated for impairment 97,797 104,989 97,797 104,989 110,052
Commercial Secured by Real Estate [Member]
          
Allowance for loan losses [Roll Forward]          
Beginning balance 14,162 13,262 13,541 11,753 11,753
Provision charged to expense 448 698 2,064 3,148 3,520
Losses charged off 477 658 1,495 1,645 2,035
Recoveries 13 87 36 133 303
Ending balance 14,146 13,389 14,146 13,389 13,541
Allowance for Loan Losses Ending balance: [Abstract]          
Individually evaluated for impairment 1,295 938 1,295 938 1,090
Collectively evaluated for impairment 12,851 12,451 12,851 12,451 12,451
Loans Ending balance: [Abstract]          
Individually evaluated for impairment 36,477 37,505 36,477 37,505 38,113
Collectively evaluated for impairment 841,458 783,420 841,458 783,420 769,100
Equipment Lease Financing [Member]
          
Allowance for loan losses [Roll Forward]          
Beginning balance 117 142 126 112 112
Provision charged to expense 3 (5) (6) 25 14
Losses charged off 0 0 0 0 0
Recoveries 0 0 0 0 0
Ending balance 120 137 120 137 126
Allowance for Loan Losses Ending balance: [Abstract]          
Individually evaluated for impairment 0 0 0 0 0
Collectively evaluated for impairment 120 137 120 137 126
Loans Ending balance: [Abstract]          
Individually evaluated for impairment 0 0 0 0 0
Collectively evaluated for impairment 9,380 10,167 9,380 10,167 9,246
Commercial Other [Member]
          
Allowance for loan losses [Roll Forward]          
Beginning balance 4,793 5,487 5,469 5,608 5,608
Provision charged to expense 551 529 937 1,454 2,330
Losses charged off 464 766 1,768 2,161 3,233
Recoveries 102 184 344 533 764
Ending balance 4,982 5,434 4,982 5,434 5,469
Allowance for Loan Losses Ending balance: [Abstract]          
Individually evaluated for impairment 158 315 158 315 338
Collectively evaluated for impairment 4,824 5,119 4,824 5,119 5,131
Loans Ending balance: [Abstract]          
Individually evaluated for impairment 15,644 12,618 15,644 12,618 14,295
Collectively evaluated for impairment 360,842 366,690 360,842 366,690 362,053
Real Estate Construction [Member]
          
Allowance for loan losses [Roll Forward]          
Beginning balance 368 390 376 354 354
Provision charged to expense 59 (8) 89 189 183
Losses charged off 49 18 87 189 189
Recoveries 4 3 4 13 28
Ending balance 382 367 382 367 376
Allowance for Loan Losses Ending balance: [Abstract]          
Individually evaluated for impairment 0 0 0 0 0
Collectively evaluated for impairment 382 367 382 367 376
Loans Ending balance: [Abstract]          
Individually evaluated for impairment 0 0 0 0 0
Collectively evaluated for impairment 53,545 54,431 53,545 54,431 55,041
Real Estate Mortgage [Member]
          
Allowance for loan losses [Roll Forward]          
Beginning balance 4,950 4,472 4,767 4,302 4,302
Provision charged to expense 202 407 648 892 1,437
Losses charged off 216 411 498 833 1,123
Recoveries 11 17 30 124 151
Ending balance 4,947 4,485 4,947 4,485 4,767
Allowance for Loan Losses Ending balance: [Abstract]          
Individually evaluated for impairment 0 0 0 0 0
Collectively evaluated for impairment 4,947 4,485 4,947 4,485 4,767
Loans Ending balance: [Abstract]          
Individually evaluated for impairment 1,028 666 1,028 666 695
Collectively evaluated for impairment 692,781 663,663 692,781 663,663 696,233
Home Equity [Member]
          
Allowance for loan losses [Roll Forward]          
Beginning balance 576 574 563 562 562
Provision charged to expense 73 26 250 119 238
Losses charged off 62 41 235 123 248
Recoveries 1 0 10 1 11
Ending balance 588 559 588 559 563
Allowance for Loan Losses Ending balance: [Abstract]          
Individually evaluated for impairment 0 0 0 0 0
Collectively evaluated for impairment 588 559 588 559 563
Loans Ending balance: [Abstract]          
Individually evaluated for impairment 0 0 0 0 0
Collectively evaluated for impairment 82,498 82,724 82,498 82,724 82,292
Consumer Direct [Member]
          
Allowance for loan losses [Roll Forward]          
Beginning balance 1,134 857 1,102 917 917
Provision charged to expense 272 (19) 611 (67) 892
Losses charged off 336 173 927 522 1,245
Recoveries 105 122 389 459 538
Ending balance 1,175 787 1,175 787 1,102
Allowance for Loan Losses Ending balance: [Abstract]          
Individually evaluated for impairment 0 0 0 0 0
Collectively evaluated for impairment 1,175 787 1,175 787 1,102
Loans Ending balance: [Abstract]          
Individually evaluated for impairment 0 0 0 0 0
Collectively evaluated for impairment 123,960 126,005 123,960 126,005 122,581
Consumer Indirect [Member]
          
Allowance for loan losses [Roll Forward]          
Beginning balance 3,666 4,019 3,268 5,540 5,540
Provision charged to expense 622 42 1,950 (756) (173)
Losses charged off 915 810 2,700 2,262 3,483
Recoveries 415 320 1,270 1,049 1,384
Ending balance 3,788 3,571 3,788 3,571 3,268
Allowance for Loan Losses Ending balance: [Abstract]          
Individually evaluated for impairment 0 0 0 0 0
Collectively evaluated for impairment 3,788 3,571 3,788 3,571 3,268
Loans Ending balance: [Abstract]          
Individually evaluated for impairment 0 0 0 0 0
Collectively evaluated for impairment $ 290,812 $ 298,557 $ 290,812 $ 298,557 $ 281,477