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Loans Impaired Loans 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
Schedule of Financing Receivables [Line Items]          
Recorded Investment $ 46,331,000 $ 43,374,000 $ 46,331,000 $ 43,374,000 $ 45,744,000
Unpaid Principal Balance 50,948,000 43,374,000 50,948,000 43,374,000 49,542,000
Related Allowance 3,006,000 4,177,000 3,006,000 4,177,000 3,539,000
Average Recorded Investment 46,774,000 44,170,000 47,046,000 42,883,000 45,019,000
Recognized Interest Income 388,000 270,000 784,000 422,000 1,039,000
With No Related Allowance Recorded [Member]
          
Schedule of Financing Receivables [Line Items]          
Recorded Investment 33,040,000 24,463,000 33,040,000 24,463,000 28,282,000
Unpaid Principal Balance 36,574,000 24,463,000 36,574,000 24,463,000 31,303,000
Related Allowance 0 0 0 0 0
Average Recorded Investment 31,519,000 25,951,000 29,998,000 25,934,000 26,837,000
Recognized Interest Income 315,000 146,000 550,000 224,000 468,000
With an Allowance Recorded [Member]
          
Schedule of Financing Receivables [Line Items]          
Recorded Investment 13,291,000 18,911,000 13,291,000 18,911,000 17,462,000
Unpaid Principal Balance 14,374,000 18,911,000 14,374,000 18,911,000 18,239,000
Related Allowance 3,006,000 4,177,000 3,006,000 4,177,000 3,539,000
Average Recorded Investment 15,255,000 18,219,000 17,048,000 16,949,000 18,182,000
Recognized Interest Income 73,000 124,000 234,000 198,000 571,000
Commercial Real Estate [Member]
          
Schedule of Financing Receivables [Line Items]          
Recorded Investment 17,332,000 13,795,000 17,332,000 13,795,000 15,774,000
Unpaid Principal Balance 18,470,000 13,795,000 18,470,000 13,795,000 16,981,000
Related Allowance 1,510,000 1,133,000 1,510,000 1,133,000 1,523,000
Average Recorded Investment 17,660,000 14,788,000 17,309,000 13,755,000 14,716,000
Recognized Interest Income 147,000 77,000 310,000 127,000 410,000
Commercial Real Estate [Member] | With No Related Allowance Recorded [Member]
          
Schedule of Financing Receivables [Line Items]          
Recorded Investment 11,452,000 10,313,000 11,452,000 10,313,000 9,386,000
Unpaid Principal Balance 11,851,000 10,313,000 11,851,000 10,313,000 9,963,000
Related Allowance 0 0 0 0 0
Average Recorded Investment 11,083,000 11,013,000 10,621,000 9,729,000 10,102,000
Recognized Interest Income 99,000 71,000 200,000 111,000 199,000
Commercial Real Estate [Member] | With an Allowance Recorded [Member]
          
Schedule of Financing Receivables [Line Items]          
Recorded Investment 5,880,000 3,482,000 5,880,000 3,482,000 6,388,000
Unpaid Principal Balance 6,619,000 3,482,000 6,619,000 3,482,000 7,018,000
Related Allowance 1,510,000 1,133,000 1,510,000 1,133,000 1,523,000
Average Recorded Investment 6,577,000 3,775,000 6,688,000 4,026,000 4,614,000
Recognized Interest Income 48,000 6,000 110,000 16,000 211,000
Commercial Real Estate Construction Financing Receivable [Member]
          
Schedule of Financing Receivables [Line Items]          
Recorded Investment 1,819,000 3,619,000 1,819,000 3,619,000 3,354,000
Unpaid Principal Balance 2,367,000 3,619,000 2,367,000 3,619,000 3,368,000
Related Allowance 266,000 787,000 266,000 787,000 969,000
Average Recorded Investment 2,002,000 3,550,000 2,507,000 3,565,000 4,349,000
Recognized Interest Income 20,000 50,000 47,000 63,000 85,000
Commercial Real Estate Construction Financing Receivable [Member] | With No Related Allowance Recorded [Member]
          
Schedule of Financing Receivables [Line Items]          
Recorded Investment 517,000 1,464,000 517,000 1,464,000 101,000
Unpaid Principal Balance 1,065,000 1,464,000 1,065,000 1,464,000 115,000
Related Allowance 0 0 0 0 0
Average Recorded Investment 376,000 1,395,000 210,000 2,189,000 2,533,000
Recognized Interest Income 27,000 13,000 28,000 26,000 0
Commercial Real Estate Construction Financing Receivable [Member] | With an Allowance Recorded [Member]
          
Schedule of Financing Receivables [Line Items]          
Recorded Investment 1,302,000 2,155,000 1,302,000 2,155,000 3,253,000
Unpaid Principal Balance 1,302,000 2,155,000 1,302,000 2,155,000 3,253,000
Related Allowance 266,000 787,000 266,000 787,000 969,000
Average Recorded Investment 1,626,000 2,155,000 2,297,000 1,376,000 1,816,000
Recognized Interest Income (7,000) 37,000 19,000 37,000 85,000
Commercial Other [Member]
          
Schedule of Financing Receivables [Line Items]          
Recorded Investment 5,790,000 4,100,000 5,790,000 4,100,000 5,861,000
Unpaid Principal Balance 6,218,000 4,100,000 6,218,000 4,100,000 6,471,000
Related Allowance 1,005,000 932,000 1,005,000 932,000 652,000
Average Recorded Investment 5,679,000 4,241,000 5,735,000 4,723,000 4,851,000
Recognized Interest Income 34,000 34,000 70,000 34,000 91,000
Commercial Other [Member] | With No Related Allowance Recorded [Member]
          
Schedule of Financing Receivables [Line Items]          
Recorded Investment 4,017,000 2,249,000 4,017,000 2,249,000 4,737,000
Unpaid Principal Balance 4,325,000 2,249,000 4,325,000 2,249,000 5,345,000
Related Allowance 0 0 0 0 0
Average Recorded Investment 3,759,000 2,439,000 3,726,000 2,710,000 2,877,000
Recognized Interest Income 32,000 21,000 59,000 16,000 53,000
Commercial Other [Member] | With an Allowance Recorded [Member]
          
Schedule of Financing Receivables [Line Items]          
Recorded Investment 1,773,000 1,851,000 1,773,000 1,851,000 1,124,000
Unpaid Principal Balance 1,893,000 1,851,000 1,893,000 1,851,000 1,126,000
Related Allowance 1,005,000 932,000 1,005,000 932,000 652,000
Average Recorded Investment 1,920,000 1,802,000 2,008,000 2,013,000 1,974,000
Recognized Interest Income 2,000 13,000 11,000 18,000 38,000
Residential Term [Member]
          
Schedule of Financing Receivables [Line Items]          
Recorded Investment 19,695,000 19,052,000 19,695,000 19,052,000 19,444,000
Unpaid Principal Balance 21,961,000 19,052,000 21,961,000 19,052,000 21,282,000
Related Allowance 218,000 966,000 218,000 966,000 395,000
Average Recorded Investment 19,753,000 18,847,000 19,822,000 18,149,000 18,867,000
Recognized Interest Income 179,000 109,000 341,000 198,000 426,000
Residential Term [Member] | With No Related Allowance Recorded [Member]
          
Schedule of Financing Receivables [Line Items]          
Recorded Investment 15,399,000 8,695,000 15,399,000 8,695,000 12,747,000
Unpaid Principal Balance 17,441,000 8,695,000 17,441,000 8,695,000 14,440,000
Related Allowance 0 0 0 0 0
Average Recorded Investment 14,636,000 9,322,000 13,862,000 9,662,000 9,801,000
Recognized Interest Income 150,000 41,000 248,000 71,000 189,000
Residential Term [Member] | With an Allowance Recorded [Member]
          
Schedule of Financing Receivables [Line Items]          
Recorded Investment 4,296,000 10,357,000 4,296,000 10,357,000 6,697,000
Unpaid Principal Balance 4,520,000 10,357,000 4,520,000 10,357,000 6,842,000
Related Allowance 218,000 966,000 218,000 966,000 395,000
Average Recorded Investment 5,117,000 9,525,000 5,961,000 8,487,000 9,066,000
Recognized Interest Income 29,000 68,000 93,000 127,000 237,000
Residential Construction [Member]
          
Schedule of Financing Receivables [Line Items]          
Recorded Investment 0 1,336,000 0 1,336,000 0
Unpaid Principal Balance 0 1,336,000 0 1,336,000 0
Related Allowance 0 48,000 0 48,000 0
Average Recorded Investment 0 1,376,000 0 1,346,000 821,000
Recognized Interest Income 0 0 0 0 0
Residential Construction [Member] | With No Related Allowance Recorded [Member]
          
Schedule of Financing Receivables [Line Items]          
Recorded Investment 0 1,002,000 0 1,002,000 0
Unpaid Principal Balance 0 1,002,000 0 1,002,000 0
Related Allowance 0 0 0 0 0
Average Recorded Investment 0 1,042,000 0 880,000 560,000
Recognized Interest Income 0 0 0 0 0
Residential Construction [Member] | With an Allowance Recorded [Member]
          
Schedule of Financing Receivables [Line Items]          
Recorded Investment 0 334,000 0 334,000 0
Unpaid Principal Balance 0 334,000 0 334,000 0
Related Allowance 0 48,000 0 48,000 0
Average Recorded Investment 0 334,000 0 466,000 261,000
Recognized Interest Income 0 0 0 0 0
Home Equity [Member]
          
Schedule of Financing Receivables [Line Items]          
Recorded Investment 1,695,000 1,456,000 1,695,000 1,456,000 1,311,000
Unpaid Principal Balance 1,932,000 1,456,000 1,932,000 1,456,000 1,440,000
Related Allowance 7,000 300,000 7,000 300,000 0
Average Recorded Investment 1,680,000 1,353,000 1,673,000 1,324,000 1,403,000
Recognized Interest Income 8,000 0 16,000 0 27,000
Home Equity [Member] | With No Related Allowance Recorded [Member]
          
Schedule of Financing Receivables [Line Items]          
Recorded Investment 1,655,000 740,000 1,655,000 740,000 1,311,000
Unpaid Principal Balance 1,892,000 740,000 1,892,000 740,000 1,440,000
Related Allowance 0 0 0 0 0
Average Recorded Investment 1,665,000 740,000 1,579,000 758,000 961,000
Recognized Interest Income 7,000 0 15,000 0 27,000
Home Equity [Member] | With an Allowance Recorded [Member]
          
Schedule of Financing Receivables [Line Items]          
Recorded Investment 40,000 716,000 40,000 716,000 0
Unpaid Principal Balance 40,000 716,000 40,000 716,000 0
Related Allowance 7,000 300,000 7,000 300,000 0
Average Recorded Investment 15,000 613,000 94,000 566,000 442,000
Recognized Interest Income 1,000 0 1,000 0 0
Consumer Loan [Member]
          
Schedule of Financing Receivables [Line Items]          
Recorded Investment 0 16,000 0 16,000 0
Unpaid Principal Balance 0 16,000 0 16,000 0
Related Allowance 0 11,000 0 11,000 0
Average Recorded Investment 0 15,000 0 21,000 12,000
Recognized Interest Income 0 0 0 0 0
Consumer Loan [Member] | With No Related Allowance Recorded [Member]
          
Schedule of Financing Receivables [Line Items]          
Recorded Investment 0 0 0 0 0
Unpaid Principal Balance 0 0 0 0 0
Related Allowance 0 0 0 0 0
Average Recorded Investment 0 0 0 6,000 3,000
Recognized Interest Income 0 0 0 0 0
Consumer Loan [Member] | With an Allowance Recorded [Member]
          
Schedule of Financing Receivables [Line Items]          
Recorded Investment 0 16,000 0 16,000 0
Unpaid Principal Balance 0 16,000 0 16,000 0
Related Allowance 0 11,000 0 11,000 0
Average Recorded Investment 0 15,000 0 15,000 9,000
Recognized Interest Income $ 0 $ 0 $ 0 $ 0 $ 0