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Allowance for Loan Losses Allowance for Loan Loss Activity by Class (Details) (USD $)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance $ 12,720,000 $ 12,954,000 $ 12,500,000 $ 13,000,000 $ 13,000,000
Charge offs 1,368,000 1,425,000 2,802,000 3,895,000 9,080,000
Recoveries 118,000 55,000 272,000 379,000 745,000
Provision 1,200,000 2,800,000 2,700,000 4,900,000 7,835,000
Ending balance 12,670,000 14,384,000 12,670,000 14,384,000 12,500,000
Ending balance specifically evaluated for impairment 3,006,000 4,177,000 3,006,000 4,177,000 3,539,000
Ending balance collectively evaluated for impairment 9,664,000 10,207,000 9,664,000 10,207,000 8,961,000
Total 866,071,000 881,814,000 866,071,000 881,814,000 869,284,000
Ending balance specifically evaluated for impairment 46,331,000 43,374,000 46,331,000 43,374,000 45,744,000
Ending balance collectively evaluated for impairment 819,740,000 838,440,000 819,740,000 838,440,000 823,540,000
Commercial Real Estate Portfolio Segment [Member]
          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 5,879,000 5,862,000 5,865,000 5,659,000 5,659,000
Charge offs 7,000 915,000 61,000 915,000 1,394,000
Recoveries 0 1,000 0 1,000 13,000
Provision (61,000) 616,000 7,000 819,000 1,587,000
Ending balance 5,811,000 5,564,000 5,811,000 5,564,000 5,865,000
Ending balance specifically evaluated for impairment 1,510,000 1,133,000 1,510,000 1,133,000 1,523,000
Ending balance collectively evaluated for impairment 4,301,000 4,431,000 4,301,000 4,431,000 4,342,000
Total 251,799,000 253,193,000 251,799,000 253,193,000 251,335,000
Ending balance specifically evaluated for impairment 17,332,000 13,795,000 17,332,000 13,795,000 15,774,000
Ending balance collectively evaluated for impairment 234,467,000 239,398,000 234,467,000 239,398,000 235,561,000
Commercial Construction [Member]
          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 1,064,000 704,000 1,359,000 658,000 658,000
Charge offs 527,000 0 930,000 0 928,000
Recoveries 0 0 0 246,000 246,000
Provision 54,000 669,000 162,000 469,000 1,383,000
Ending balance 591,000 1,373,000 591,000 1,373,000 1,359,000
Ending balance specifically evaluated for impairment 266,000 787,000 266,000 787,000 969,000
Ending balance collectively evaluated for impairment 325,000 586,000 325,000 586,000 390,000
Total 18,641,000 33,072,000 18,641,000 33,072,000 22,417,000
Ending balance specifically evaluated for impairment 1,819,000 3,619,000 1,819,000 3,619,000 3,354,000
Ending balance collectively evaluated for impairment 16,822,000 29,453,000 16,822,000 29,453,000 19,063,000
Commercial Other [Member]
          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 2,115,000 2,125,000 2,050,000 2,063,000 2,063,000
Charge offs 233,000 160,000 521,000 2,162,000 3,215,000
Recoveries 41,000 9,000 144,000 11,000 113,000
Provision 649,000 502,000 899,000 2,564,000 3,089,000
Ending balance 2,572,000 2,476,000 2,572,000 2,476,000 2,050,000
Ending balance specifically evaluated for impairment 1,005,000 932,000 1,005,000 932,000 652,000
Ending balance collectively evaluated for impairment 1,567,000 1,544,000 1,567,000 1,544,000 1,398,000
Total 91,393,000 87,833,000 91,393,000 87,833,000 81,183,000
Ending balance specifically evaluated for impairment 5,790,000 4,100,000 5,790,000 4,100,000 5,861,000
Ending balance collectively evaluated for impairment 85,603,000 83,733,000 85,603,000 83,733,000 75,322,000
Municipal [Member]
          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 18,000 19,000 18,000 19,000 19,000
Charge offs 0 0 0 0 0
Recoveries 0 0 0 0 0
Provision 0 0 0 0 (1,000)
Ending balance 18,000 19,000 18,000 19,000 18,000
Ending balance specifically evaluated for impairment 0 0 0 0 0
Ending balance collectively evaluated for impairment 18,000 19,000 18,000 19,000 18,000
Total 14,885,000 16,089,000 14,885,000 16,089,000 14,704,000
Ending balance specifically evaluated for impairment 0 0 0 0 0
Ending balance collectively evaluated for impairment 14,885,000 16,089,000 14,885,000 16,089,000 14,704,000
Residential Term [Member]
          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 1,113,000 1,236,000 1,109,000 1,159,000 1,159,000
Charge offs 407,000 136,000 607,000 375,000 1,911,000
Recoveries 34,000 1,000 36,000 2,000 110,000
Provision 286,000 486,000 488,000 801,000 1,751,000
Ending balance 1,026,000 1,587,000 1,026,000 1,587,000 1,109,000
Ending balance specifically evaluated for impairment 218,000 966,000 218,000 966,000 395,000
Ending balance collectively evaluated for impairment 808,000 621,000 808,000 621,000 714,000
Total 374,522,000 368,876,000 374,522,000 368,876,000 379,447,000
Ending balance specifically evaluated for impairment 19,695,000 19,052,000 19,695,000 19,052,000 19,444,000
Ending balance collectively evaluated for impairment 354,827,000 349,824,000 354,827,000 349,824,000 360,003,000
Residential Construction [Member]
          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 9,000 59,000 11,000 255,000 255,000
Charge offs 0 118,000 0 118,000 389,000
Recoveries 0 0 0 0 54,000
Provision 0 117,000 (2,000) (79,000) 91,000
Ending balance 9,000 58,000 9,000 58,000 11,000
Ending balance specifically evaluated for impairment 0 48,000 0 48,000 0
Ending balance collectively evaluated for impairment 9,000 10,000 9,000 10,000 11,000
Total 4,759,000 6,449,000 4,759,000 6,449,000 6,459,000
Ending balance specifically evaluated for impairment 0 1,336,000 0 1,336,000 0
Ending balance collectively evaluated for impairment 4,759,000 5,113,000 4,759,000 5,113,000 6,459,000
Home Equity [Member]
          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 859,000 682,000 654,000 595,000 595,000
Charge offs 69,000 0 431,000 49,000 688,000
Recoveries 1,000 0 2,000 0 1,000
Provision (54,000) 127,000 512,000 263,000 746,000
Ending balance 737,000 809,000 737,000 809,000 654,000
Ending balance specifically evaluated for impairment 7,000 300,000 7,000 300,000 0
Ending balance collectively evaluated for impairment 730,000 509,000 730,000 509,000 654,000
Total 95,013,000 100,689,000 95,013,000 100,689,000 99,082,000
Ending balance specifically evaluated for impairment 1,695,000 1,456,000 1,695,000 1,456,000 1,311,000
Ending balance collectively evaluated for impairment 93,318,000 99,233,000 93,318,000 99,233,000 97,771,000
Consumer Portfolio Segment [Member]
          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 574,000 568,000 592,000 584,000 584,000
Charge offs 125,000 96,000 252,000 276,000 555,000
Recoveries 42,000 44,000 90,000 119,000 208,000
Provision 140,000 87,000 201,000 176,000 355,000
Ending balance 631,000 603,000 631,000 603,000 592,000
Ending balance specifically evaluated for impairment 0 11,000 0 11,000 0
Ending balance collectively evaluated for impairment 631,000 592,000 631,000 592,000 592,000
Total 15,059,000 15,613,000 15,059,000 15,613,000 14,657,000
Ending balance specifically evaluated for impairment 0 16,000 0 16,000 0
Ending balance collectively evaluated for impairment 15,059,000 15,597,000 15,059,000 15,597,000 14,657,000
Unallocated Financing Receivables [Member]
          
Allowance for Loan and Lease Losses [Roll Forward]          
Beginning balance 1,089,000 1,699,000 842,000 2,008,000 2,008,000
Charge offs 0 0 0 0 0
Recoveries 0 0 0 0 0
Provision 186,000 196,000 433,000 (113,000) (1,166,000)
Ending balance 1,275,000 1,895,000 1,275,000 1,895,000 842,000
Ending balance specifically evaluated for impairment 0 0 0 0 0
Ending balance collectively evaluated for impairment 1,275,000 1,895,000 1,275,000 1,895,000 842,000
Total 0 0 0 0 0
Ending balance specifically evaluated for impairment 0 0 0 0 0
Ending balance collectively evaluated for impairment $ 0 $ 0 $ 0 $ 0 $ 0