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Allowance for Loan Losses Allowance for Loan Loss Activity by Class (Details) (USD $)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Mar. 31, 2013
Mar. 31, 2012
Allowance for Loan and Lease Losses [Roll Forward]              
Beginning balance     $ 12,500,000 $ 13,000,000 $ 13,000,000 $ 12,670,000 $ 14,384,000
Charge offs 1,091,000 1,169,000 3,893,000 5,064,000 9,080,000    
Recoveries 78,000 124,000 350,000 503,000 745,000    
Provision 800,000 1,400,000 3,500,000 6,300,000 7,835,000    
Ending balance 12,457,000 14,739,000 12,457,000 14,739,000 12,500,000 12,670,000 14,384,000
Ending balance specifically evaluated for impairment 2,845,000 5,062,000 2,845,000 5,062,000 3,539,000    
Ending balance collectively evaluated for impairment 9,612,000 9,677,000 9,612,000 9,677,000 8,961,000    
Total 862,073,000 869,871,000 862,073,000 869,871,000 869,284,000    
Ending balance specifically evaluated for impairment 44,076,000 48,645,000 44,076,000 48,645,000 45,744,000    
Ending balance collectively evaluated for impairment 817,997,000 821,226,000 817,997,000 821,226,000 823,540,000    
Commercial Real Estate Portfolio Segment [Member]
              
Allowance for Loan and Lease Losses [Roll Forward]              
Beginning balance     5,865,000 5,659,000 5,659,000 5,811,000 5,564,000
Charge offs 89,000 186,000 150,000 1,101,000 1,394,000    
Recoveries 0 3,000 0 4,000 13,000    
Provision 81,000 314,000 88,000 1,133,000 1,587,000    
Ending balance 5,803,000 5,695,000 5,803,000 5,695,000 5,865,000 5,811,000 5,564,000
Ending balance specifically evaluated for impairment 1,535,000 1,416,000 1,535,000 1,416,000 1,523,000    
Ending balance collectively evaluated for impairment 4,268,000 4,279,000 4,268,000 4,279,000 4,342,000    
Total 248,889,000 256,531,000 248,889,000 256,531,000 251,335,000    
Ending balance specifically evaluated for impairment 16,970,000 16,321,000 16,970,000 16,321,000 15,774,000    
Ending balance collectively evaluated for impairment 231,919,000 240,210,000 231,919,000 240,210,000 235,561,000    
Commercial Construction [Member]
              
Allowance for Loan and Lease Losses [Roll Forward]              
Beginning balance     1,359,000 658,000 658,000 591,000 1,373,000
Charge offs 33,000 87,000 963,000 87,000 928,000    
Recoveries 0 1,000 0 247,000 246,000    
Provision 51,000 (228,000) 213,000 241,000 1,383,000    
Ending balance 609,000 1,059,000 609,000 1,059,000 1,359,000 591,000 1,373,000
Ending balance specifically evaluated for impairment 269,000 696,000 269,000 696,000 969,000    
Ending balance collectively evaluated for impairment 340,000 363,000 340,000 363,000 390,000    
Total 19,409,000 21,905,000 19,409,000 21,905,000 22,417,000    
Ending balance specifically evaluated for impairment 1,364,000 6,645,000 1,364,000 6,645,000 3,354,000    
Ending balance collectively evaluated for impairment 18,045,000 15,260,000 18,045,000 15,260,000 19,063,000    
Commercial Other [Member]
              
Allowance for Loan and Lease Losses [Roll Forward]              
Beginning balance     2,050,000 2,063,000 2,063,000 2,572,000 2,476,000
Charge offs 532,000 6,000 1,053,000 2,168,000 3,215,000    
Recoveries 13,000 39,000 157,000 50,000 113,000    
Provision 216,000 123,000 1,115,000 2,687,000 3,089,000    
Ending balance 2,269,000 2,632,000 2,269,000 2,632,000 2,050,000 2,572,000 2,476,000
Ending balance specifically evaluated for impairment 807,000 1,240,000 807,000 1,240,000 652,000    
Ending balance collectively evaluated for impairment 1,462,000 1,392,000 1,462,000 1,392,000 1,398,000    
Total 85,130,000 83,703,000 85,130,000 83,703,000 81,183,000    
Ending balance specifically evaluated for impairment 4,926,000 4,905,000 4,926,000 4,905,000 5,861,000    
Ending balance collectively evaluated for impairment 80,204,000 78,798,000 80,204,000 78,798,000 75,322,000    
Municipal [Member]
              
Allowance for Loan and Lease Losses [Roll Forward]              
Beginning balance     18,000 19,000 19,000 18,000 19,000
Charge offs 0 0 0 0 0    
Recoveries 0 0 0 0 0    
Provision (2,000) (1,000) (2,000) (1,000) (1,000)    
Ending balance 16,000 18,000 16,000 18,000 18,000 18,000 19,000
Ending balance specifically evaluated for impairment 0 0 0 0 0    
Ending balance collectively evaluated for impairment 16,000 18,000 16,000 18,000 18,000    
Total 18,218,000 16,448,000 18,218,000 16,448,000 14,704,000    
Ending balance specifically evaluated for impairment 0 0 0 0 0    
Ending balance collectively evaluated for impairment 18,218,000 16,448,000 18,218,000 16,448,000 14,704,000    
Residential Term [Member]
              
Allowance for Loan and Lease Losses [Roll Forward]              
Beginning balance     1,109,000 1,159,000 1,159,000 1,026,000 1,587,000
Charge offs 302,000 179,000 909,000 554,000 1,911,000    
Recoveries 2,000 1,000 38,000 3,000 110,000    
Provision 256,000 814,000 744,000 1,615,000 1,751,000    
Ending balance 982,000 2,223,000 982,000 2,223,000 1,109,000 1,026,000 1,587,000
Ending balance specifically evaluated for impairment 228,000 1,494,000 228,000 1,494,000 395,000    
Ending balance collectively evaluated for impairment 754,000 729,000 754,000 729,000 714,000    
Total 375,387,000 369,949,000 375,387,000 369,949,000 379,447,000    
Ending balance specifically evaluated for impairment 19,138,000 19,305,000 19,138,000 19,305,000 19,444,000    
Ending balance collectively evaluated for impairment 356,249,000 350,644,000 356,249,000 350,644,000 360,003,000    
Residential Construction [Member]
              
Allowance for Loan and Lease Losses [Roll Forward]              
Beginning balance     11,000 255,000 255,000 9,000 58,000
Charge offs 0 263,000 0 381,000 389,000    
Recoveries 0 42,000 0 42,000 54,000    
Provision 6,000 177,000 4,000 98,000 91,000    
Ending balance 15,000 14,000 15,000 14,000 11,000 9,000 58,000
Ending balance specifically evaluated for impairment 0 0 0 0 0    
Ending balance collectively evaluated for impairment 15,000 14,000 15,000 14,000 11,000    
Total 7,617,000 6,528,000 7,617,000 6,528,000 6,459,000    
Ending balance specifically evaluated for impairment 0 23,000 0 23,000 0    
Ending balance collectively evaluated for impairment 7,617,000 6,505,000 7,617,000 6,505,000 6,459,000    
Home Equity [Member]
              
Allowance for Loan and Lease Losses [Roll Forward]              
Beginning balance     654,000 595,000 595,000 737,000 809,000
Charge offs 54,000 342,000 485,000 391,000 688,000    
Recoveries 3,000 0 5,000 0 1,000    
Provision (20,000) 323,000 492,000 586,000 746,000    
Ending balance 666,000 790,000 666,000 790,000 654,000 737,000 809,000
Ending balance specifically evaluated for impairment 6,000 215,000 6,000 215,000 0    
Ending balance collectively evaluated for impairment 660,000 575,000 660,000 575,000 654,000    
Total 92,374,000 100,099,000 92,374,000 100,099,000 99,082,000    
Ending balance specifically evaluated for impairment 1,678,000 1,445,000 1,678,000 1,445,000 1,311,000    
Ending balance collectively evaluated for impairment 90,696,000 98,654,000 90,696,000 98,654,000 97,771,000    
Consumer Portfolio Segment [Member]
              
Allowance for Loan and Lease Losses [Roll Forward]              
Beginning balance     592,000 584,000 584,000 631,000 603,000
Charge offs 81,000 106,000 333,000 382,000 555,000    
Recoveries 60,000 38,000 150,000 157,000 208,000    
Provision (57,000) 13,000 144,000 189,000 355,000    
Ending balance 553,000 548,000 553,000 548,000 592,000 631,000 603,000
Ending balance specifically evaluated for impairment 0 1,000 0 1,000 0    
Ending balance collectively evaluated for impairment 553,000 547,000 553,000 547,000 592,000    
Total 15,049,000 14,708,000 15,049,000 14,708,000 14,657,000    
Ending balance specifically evaluated for impairment 0 1,000 0 1,000 0    
Ending balance collectively evaluated for impairment 15,049,000 14,707,000 15,049,000 14,707,000 14,657,000    
Unallocated Financing Receivables [Member]
              
Allowance for Loan and Lease Losses [Roll Forward]              
Beginning balance     842,000 2,008,000 2,008,000 1,275,000 1,895,000
Charge offs 0 0 0 0 0    
Recoveries 0 0 0 0 0    
Provision 269,000 (135,000) 702,000 (248,000) (1,166,000)    
Ending balance 1,544,000 1,760,000 1,544,000 1,760,000 842,000 1,275,000 1,895,000
Ending balance specifically evaluated for impairment 0 0 0 0 0    
Ending balance collectively evaluated for impairment 1,544,000 1,760,000 1,544,000 1,760,000 842,000    
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