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Allowance for Loan Losses (Details) (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Other Real Estate, Average Percentage of Sales Price below Appraised Value                 18.00%    
Other Real Estate, Additional Discount Percentage to Calculate Allowances for Losses                 20.00%    
Ending balance specifically evaluated for impairment $ 2,461,000 $ 3,539,000             $ 2,461,000 $ 3,539,000 $ 2,058,000
Allowance for loans evaluated collectively for impairment 9,053,000 8,961,000             9,053,000 8,961,000 10,942,000
Allowance for Loan and Lease Losses, Related Loans, Percentage                 0.40% 0.44%  
Allowance for Loan and Lease Losses, Related Loans, Period Increase (Decrease)                 346,000    
Allowance for loan losses 11,514,000 12,500,000             11,514,000 12,500,000 13,000,000
Risk Based Ratios, Weighted-Average Required Reserve as Percent of Total Loans                 1.33%    
Commercial and municipal risk-rated loans receivable 380,731,000 369,639,000             380,731,000 369,639,000  
Residential loans typical loan-to-value range, low (in hundredths) 75.00%               75.00%    
Residential loans typical loan-to-value maximum (in hundredths) 80.00%               80.00%    
Collateralized consumer loans to individuals loan-to-value maximum range, low (in hundredths) 80.00%               80.00%    
Collateralized consumer loans to individuals loan-to-value maximum range, high (in hundredths) 90.00%               90.00%    
Delinquent period before residential loans placed on non-accrual status (in days)                 90 days    
Delinquent period before consumer loans charged off (in days)                 120 days    
Allowance for loan losses                      
Beginning balance         13,000,000     13,316,000 12,500,000 13,000,000 13,316,000
Chargeoffs                 5,855,000 9,080,000 11,179,000
Recoveries                 (669,000) (745,000) (313,000)
Provision for loan losses 700,000 1,535,000 800,000 1,200,000 1,500,000 1,400,000 2,800,000 2,100,000 4,200,000 7,835,000 10,550,000
Ending balance 11,514,000 12,500,000             11,514,000 12,500,000 13,000,000
Ending balance specifically evaluated for impairment 2,461,000 3,539,000             2,461,000 3,539,000 2,058,000
Ending balance collectively evaluated for impairment 9,053,000 8,961,000             9,053,000 8,961,000 10,942,000
Related loan balances                      
Ending balance 876,367,000 869,284,000             876,367,000 869,284,000 864,988,000
Ending balance specifically evaluated for impairment 42,351,000 45,744,000             42,351,000 45,744,000 42,120,000
Ending balance collectively evaluated for impairment 834,016,000 823,540,000             834,016,000 823,540,000 822,868,000
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]                      
Commercial real estate loans maximum loan-to-value (in hundredths) 75.00%               75.00%    
Construction loans actual loan portfolio-to-Company capital (in hundredths) 24.50%               24.50%    
Construction loans maximum loan portfolio-to-Company capital (in hundredths) 100.00%               100.00%    
Construction and non-owner-occupied commercial real estate loan portfolio-to-Company Capital (in hundredths) 75.60%               75.60%    
Construction and non-owner-occupied commercial real estate loan portfolio loan-to-Company capital (in hundredths) 300.00%               300.00%    
Strong 1
                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Commercial and municipal risk-rated loans receivable 281,000 2,021,000             281,000 2,021,000  
Above Average 2
                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Commercial and municipal risk-rated loans receivable 38,318,000 26,290,000             38,318,000 26,290,000  
Satisfactory 3
                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Commercial and municipal risk-rated loans receivable 63,823,000 54,831,000             63,823,000 54,831,000  
Average 4
                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Commercial and municipal risk-rated loans receivable 161,073,000 143,077,000             161,073,000 143,077,000  
Watch 5
                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Commercial and municipal risk-rated loans receivable 42,791,000 64,614,000             42,791,000 64,614,000  
OAEM 6
                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Commercial and municipal risk-rated loans receivable 32,288,000 31,681,000             32,288,000 31,681,000  
Substandard 7
                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Commercial and municipal risk-rated loans receivable 41,532,000 46,668,000             41,532,000 46,668,000  
Doubtful 8
                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Commercial and municipal risk-rated loans receivable 625,000 457,000             625,000 457,000  
Specific Reserves Evaluated Individually for Impairment
                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Allowance for loan losses 2,461,000 3,539,000             2,461,000 3,539,000  
Allowance for loan losses                      
Ending balance 2,461,000 3,539,000             2,461,000 3,539,000  
General Reserves Based on Historical Loss Experience
                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Allowance for loan losses 3,906,000 4,304,000             3,906,000 4,304,000  
Allowance for loan losses                      
Ending balance 3,906,000 4,304,000             3,906,000 4,304,000  
Reserve for Qualitative Factors
                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Allowance for loan losses 3,469,000 3,815,000             3,469,000 3,815,000  
Allowance for loan losses                      
Ending balance 3,469,000 3,815,000             3,469,000 3,815,000  
Unallocated Reserves
                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Allowance for loan losses 1,678,000 842,000             1,678,000 842,000  
Allowance for loan losses                      
Ending balance 1,678,000 842,000             1,678,000 842,000  
Commercial Real Estate
                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Ending balance specifically evaluated for impairment 890,000 1,523,000             890,000 1,523,000 808,000
Allowance for loans evaluated collectively for impairment 3,712,000 4,342,000             3,712,000 4,342,000 4,851,000
Allowance for loan losses 4,602,000 5,865,000             4,602,000 5,865,000 5,659,000
Commercial and municipal risk-rated loans receivable 245,943,000 251,335,000             245,943,000 251,335,000  
Allowance for loan losses                      
Beginning balance         5,659,000     5,260,000 5,865,000 5,659,000 5,260,000
Chargeoffs                 150,000 1,394,000 1,619,000
Recoveries                 0 (13,000) (23,000)
Provision for loan losses                 (1,113,000) 1,587,000 1,995,000
Ending balance 4,602,000 5,865,000             4,602,000 5,865,000 5,659,000
Ending balance specifically evaluated for impairment 890,000 1,523,000             890,000 1,523,000 808,000
Ending balance collectively evaluated for impairment 3,712,000 4,342,000             3,712,000 4,342,000 4,851,000
Related loan balances                      
Ending balance 245,943,000 251,335,000             245,943,000 251,335,000 255,424,000
Ending balance specifically evaluated for impairment 14,935,000 15,774,000             14,935,000 15,774,000 10,141,000
Ending balance collectively evaluated for impairment 231,008,000 235,561,000             231,008,000 235,561,000 245,283,000
Commercial Real Estate | Strong 1
                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Commercial and municipal risk-rated loans receivable 16,000 19,000             16,000 19,000  
Commercial Real Estate | Above Average 2
                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Commercial and municipal risk-rated loans receivable 14,565,000 13,871,000             14,565,000 13,871,000  
Commercial Real Estate | Satisfactory 3
                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Commercial and municipal risk-rated loans receivable 45,213,000 34,454,000             45,213,000 34,454,000  
Commercial Real Estate | Average 4
                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Commercial and municipal risk-rated loans receivable 100,343,000 99,712,000             100,343,000 99,712,000  
Commercial Real Estate | Watch 5
                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Commercial and municipal risk-rated loans receivable 32,326,000 43,369,000             32,326,000 43,369,000  
Commercial Real Estate | OAEM 6
                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Commercial and municipal risk-rated loans receivable 26,102,000 26,302,000             26,102,000 26,302,000  
Commercial Real Estate | Substandard 7
                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Commercial and municipal risk-rated loans receivable 27,115,000 33,153,000             27,115,000 33,153,000  
Commercial Real Estate | Doubtful 8
                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Commercial and municipal risk-rated loans receivable 263,000 455,000             263,000 455,000  
Commercial Real Estate | Specific Reserves Evaluated Individually for Impairment
                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Allowance for loan losses 890,000 1,523,000             890,000 1,523,000  
Allowance for loan losses                      
Ending balance 890,000 1,523,000             890,000 1,523,000  
Commercial Real Estate | General Reserves Based on Historical Loss Experience
                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Allowance for loan losses 1,927,000 2,369,000             1,927,000 2,369,000  
Allowance for loan losses                      
Ending balance 1,927,000 2,369,000             1,927,000 2,369,000  
Commercial Real Estate | Reserve for Qualitative Factors
                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Allowance for loan losses 1,785,000 1,973,000             1,785,000 1,973,000  
Allowance for loan losses                      
Ending balance 1,785,000 1,973,000             1,785,000 1,973,000  
Commercial Real Estate | Unallocated Reserves
                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Allowance for loan losses 0 0             0 0  
Allowance for loan losses                      
Ending balance 0 0             0 0  
Commercial Construction
                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Ending balance specifically evaluated for impairment 272,000 969,000             272,000 969,000 33,000
Allowance for loans evaluated collectively for impairment 303,000 390,000             303,000 390,000 625,000
Allowance for loan losses 575,000 1,359,000             575,000 1,359,000 658,000
Commercial and municipal risk-rated loans receivable 20,382,000 22,417,000             20,382,000 22,417,000  
Allowance for loan losses                      
Beginning balance         658,000     1,012,000 1,359,000 658,000 1,012,000
Chargeoffs                 963,000 928,000 346,000
Recoveries                 0 (246,000) 0
Provision for loan losses                 179,000 1,383,000 (8,000)
Ending balance 575,000 1,359,000             575,000 1,359,000 658,000
Ending balance specifically evaluated for impairment 272,000 969,000             272,000 969,000 33,000
Ending balance collectively evaluated for impairment 303,000 390,000             303,000 390,000 625,000
Related loan balances                      
Ending balance 20,382,000 22,417,000             20,382,000 22,417,000 32,574,000
Ending balance specifically evaluated for impairment 1,284,000 3,354,000             1,284,000 3,354,000 5,702,000
Ending balance collectively evaluated for impairment 19,098,000 19,063,000             19,098,000 19,063,000 26,872,000
Commercial Construction | Strong 1
                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Commercial and municipal risk-rated loans receivable 0 0             0 0  
Commercial Construction | Above Average 2
                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Commercial and municipal risk-rated loans receivable 804,000 1,274,000             804,000 1,274,000  
Commercial Construction | Satisfactory 3
                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Commercial and municipal risk-rated loans receivable 871,000 2,312,000             871,000 2,312,000  
Commercial Construction | Average 4
                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Commercial and municipal risk-rated loans receivable 14,938,000 12,322,000             14,938,000 12,322,000  
Commercial Construction | Watch 5
                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Commercial and municipal risk-rated loans receivable 26,000 1,721,000             26,000 1,721,000  
Commercial Construction | OAEM 6
                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Commercial and municipal risk-rated loans receivable 2,948,000 79,000             2,948,000 79,000  
Commercial Construction | Substandard 7
                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Commercial and municipal risk-rated loans receivable 795,000 4,709,000             795,000 4,709,000  
Commercial Construction | Doubtful 8
                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Commercial and municipal risk-rated loans receivable 0 0             0 0  
Commercial Construction | Specific Reserves Evaluated Individually for Impairment
                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Allowance for loan losses 272,000 969,000             272,000 969,000  
Allowance for loan losses                      
Ending balance 272,000 969,000             272,000 969,000  
Commercial Construction | General Reserves Based on Historical Loss Experience
                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Allowance for loan losses 157,000 213,000             157,000 213,000  
Allowance for loan losses                      
Ending balance 157,000 213,000             157,000 213,000  
Commercial Construction | Reserve for Qualitative Factors
                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Allowance for loan losses 146,000 177,000             146,000 177,000  
Allowance for loan losses                      
Ending balance 146,000 177,000             146,000 177,000  
Commercial Construction | Unallocated Reserves
                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Allowance for loan losses 0 0             0 0  
Allowance for loan losses                      
Ending balance 0 0             0 0  
Commercial Other
                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Ending balance specifically evaluated for impairment 841,000 652,000             841,000 652,000 402,000
Allowance for loans evaluated collectively for impairment 1,435,000 1,398,000             1,435,000 1,398,000 1,661,000
Allowance for loan losses 2,276,000 2,050,000             2,276,000 2,050,000 2,063,000
Commercial and municipal risk-rated loans receivable 95,289,000 81,183,000             95,289,000 81,183,000  
Allowance for loan losses                      
Beginning balance         2,063,000     2,377,000 2,050,000 2,063,000 2,377,000
Chargeoffs                 2,583,000 3,215,000 6,492,000
Recoveries                 (359,000) (113,000) (60,000)
Provision for loan losses                 2,450,000 3,089,000 6,118,000
Ending balance 2,276,000 2,050,000             2,276,000 2,050,000 2,063,000
Ending balance specifically evaluated for impairment 841,000 652,000             841,000 652,000 402,000
Ending balance collectively evaluated for impairment 1,435,000 1,398,000             1,435,000 1,398,000 1,661,000
Related loan balances                      
Ending balance 95,289,000 81,183,000             95,289,000 81,183,000 86,982,000
Ending balance specifically evaluated for impairment 6,698,000 5,861,000             6,698,000 5,861,000 7,042,000
Ending balance collectively evaluated for impairment 88,591,000 75,322,000             88,591,000 75,322,000 79,940,000
Commercial Other | Strong 1
                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Commercial and municipal risk-rated loans receivable 265,000 271,000             265,000 271,000  
Commercial Other | Above Average 2
                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Commercial and municipal risk-rated loans receivable 6,719,000 4,084,000             6,719,000 4,084,000  
Commercial Other | Satisfactory 3
                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Commercial and municipal risk-rated loans receivable 14,852,000 14,578,000             14,852,000 14,578,000  
Commercial Other | Average 4
                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Commercial and municipal risk-rated loans receivable 45,792,000 28,618,000             45,792,000 28,618,000  
Commercial Other | Watch 5
                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Commercial and municipal risk-rated loans receivable 10,439,000 19,524,000             10,439,000 19,524,000  
Commercial Other | OAEM 6
                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Commercial and municipal risk-rated loans receivable 3,238,000 5,300,000             3,238,000 5,300,000  
Commercial Other | Substandard 7
                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Commercial and municipal risk-rated loans receivable 13,622,000 8,806,000             13,622,000 8,806,000  
Commercial Other | Doubtful 8
                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Commercial and municipal risk-rated loans receivable 362,000 2,000             362,000 2,000  
Commercial Other | Specific Reserves Evaluated Individually for Impairment
                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Allowance for loan losses 841,000 652,000             841,000 652,000  
Allowance for loan losses                      
Ending balance 841,000 652,000             841,000 652,000  
Commercial Other | General Reserves Based on Historical Loss Experience
                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Allowance for loan losses 745,000 763,000             745,000 763,000  
Allowance for loan losses                      
Ending balance 745,000 763,000             745,000 763,000  
Commercial Other | Reserve for Qualitative Factors
                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Allowance for loan losses 690,000 635,000             690,000 635,000  
Allowance for loan losses                      
Ending balance 690,000 635,000             690,000 635,000  
Commercial Other | Unallocated Reserves
                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Allowance for loan losses 0 0             0 0  
Allowance for loan losses                      
Ending balance 0 0             0 0  
Municipal
                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Ending balance specifically evaluated for impairment 0 0             0 0 0
Allowance for loans evaluated collectively for impairment 15,000 18,000             15,000 18,000 19,000
Allowance for loan losses 15,000 18,000             15,000 18,000 19,000
Commercial and municipal risk-rated loans receivable 19,117,000 14,704,000             19,117,000 14,704,000  
Allowance for loan losses                      
Beginning balance         19,000     19,000 18,000 19,000 19,000
Chargeoffs                 0 0 0
Recoveries                 0 0 0
Provision for loan losses                 (3,000) 1,000 0
Ending balance 15,000 18,000             15,000 18,000 19,000
Ending balance specifically evaluated for impairment 0 0             0 0 0
Ending balance collectively evaluated for impairment 15,000 18,000             15,000 18,000 19,000
Related loan balances                      
Ending balance 19,117,000 14,704,000             19,117,000 14,704,000 16,221,000
Ending balance specifically evaluated for impairment 0 0             0 0 0
Ending balance collectively evaluated for impairment 19,117,000 14,704,000             19,117,000 14,704,000 16,221,000
Municipal | Strong 1
                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Commercial and municipal risk-rated loans receivable 0 1,731,000             0 1,731,000  
Municipal | Above Average 2
                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Commercial and municipal risk-rated loans receivable 16,230,000 7,061,000             16,230,000 7,061,000  
Municipal | Satisfactory 3
                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Commercial and municipal risk-rated loans receivable 2,887,000 3,487,000             2,887,000 3,487,000  
Municipal | Average 4
                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Commercial and municipal risk-rated loans receivable 0 2,425,000             0 2,425,000  
Municipal | Watch 5
                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Commercial and municipal risk-rated loans receivable 0 0             0 0  
Municipal | OAEM 6
                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Commercial and municipal risk-rated loans receivable 0 0             0 0  
Municipal | Substandard 7
                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Commercial and municipal risk-rated loans receivable 0 0             0 0  
Municipal | Doubtful 8
                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Commercial and municipal risk-rated loans receivable 0 0             0 0  
Municipal | Specific Reserves Evaluated Individually for Impairment
                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Allowance for loan losses 0               0    
Allowance for loan losses                      
Ending balance 0               0    
Municipal | General Reserves Based on Historical Loss Experience
                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Allowance for loan losses 0               0    
Allowance for loan losses                      
Ending balance 0               0    
Municipal | Reserve for Qualitative Factors
                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Allowance for loan losses 15,000 18,000             15,000 18,000  
Allowance for loan losses                      
Ending balance 15,000 18,000             15,000 18,000  
Municipal | Unallocated Reserves
                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Allowance for loan losses 0 0             0 0  
Allowance for loan losses                      
Ending balance 0 0             0 0  
Residential Term
                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Ending balance specifically evaluated for impairment 404,000 395,000             404,000 395,000 478,000
Allowance for loans evaluated collectively for impairment 695,000 714,000             695,000 714,000 681,000
Allowance for loan losses 1,099,000 1,109,000             1,099,000 1,109,000 1,159,000
Allowance for loan losses                      
Beginning balance         1,159,000     1,408,000 1,109,000 1,159,000 1,408,000
Chargeoffs                 1,118,000 1,911,000 1,421,000
Recoveries                 (103,000) (110,000) (7,000)
Provision for loan losses                 1,005,000 1,751,000 1,165,000
Ending balance 1,099,000 1,109,000             1,099,000 1,109,000 1,159,000
Ending balance specifically evaluated for impairment 404,000 395,000             404,000 395,000 478,000
Ending balance collectively evaluated for impairment 695,000 714,000             695,000 714,000 681,000
Related loan balances                      
Ending balance 377,218,000 379,447,000             377,218,000 379,447,000 341,286,000
Ending balance specifically evaluated for impairment 17,786,000 19,444,000             17,786,000 19,444,000 16,821,000
Ending balance collectively evaluated for impairment 359,432,000 360,003,000             359,432,000 360,003,000 324,465,000
Residential Term | Specific Reserves Evaluated Individually for Impairment
                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Allowance for loan losses 404,000 395,000             404,000 395,000  
Allowance for loan losses                      
Ending balance 404,000 395,000             404,000 395,000  
Residential Term | General Reserves Based on Historical Loss Experience
                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Allowance for loan losses 342,000 278,000             342,000 278,000  
Allowance for loan losses                      
Ending balance 342,000 278,000             342,000 278,000  
Residential Term | Reserve for Qualitative Factors
                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Allowance for loan losses 353,000 436,000             353,000 436,000  
Allowance for loan losses                      
Ending balance 353,000 436,000             353,000 436,000  
Residential Term | Unallocated Reserves
                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Allowance for loan losses 0 0             0 0  
Allowance for loan losses                      
Ending balance 0 0             0 0  
Residential Construction
                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Ending balance specifically evaluated for impairment 0 0             0 0 235,000
Allowance for loans evaluated collectively for impairment 21,000 11,000             21,000 11,000 20,000
Allowance for loan losses 21,000 11,000             21,000 11,000 255,000
Allowance for loan losses                      
Beginning balance         255,000     44,000 11,000 255,000 44,000
Chargeoffs                 0 389,000 505,000
Recoveries                 0 (54,000) 0
Provision for loan losses                 10,000 91,000 716,000
Ending balance 21,000 11,000             21,000 11,000 255,000
Ending balance specifically evaluated for impairment 0 0             0 0 235,000
Ending balance collectively evaluated for impairment 21,000 11,000             21,000 11,000 20,000
Related loan balances                      
Ending balance 11,803,000 6,459,000             11,803,000 6,459,000 10,469,000
Ending balance specifically evaluated for impairment 0 0             0 0 1,198,000
Ending balance collectively evaluated for impairment 11,803,000 6,459,000             11,803,000 6,459,000 9,271,000
Residential Construction | Specific Reserves Evaluated Individually for Impairment
                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Allowance for loan losses 0 0             0 0  
Allowance for loan losses                      
Ending balance 0 0             0 0  
Residential Construction | General Reserves Based on Historical Loss Experience
                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Allowance for loan losses 10,000 4,000             10,000 4,000  
Allowance for loan losses                      
Ending balance 10,000 4,000             10,000 4,000  
Residential Construction | Reserve for Qualitative Factors
                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Allowance for loan losses 11,000 7,000             11,000 7,000  
Allowance for loan losses                      
Ending balance 11,000 7,000             11,000 7,000  
Residential Construction | Unallocated Reserves
                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Allowance for loan losses 0 0             0 0  
Allowance for loan losses                      
Ending balance 0 0             0 0  
Home equity line of credit
                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Ending balance specifically evaluated for impairment 54,000 0             54,000 0 91,000
Allowance for loans evaluated collectively for impairment 621,000 654,000             621,000 654,000 504,000
Allowance for loan losses 675,000 654,000             675,000 654,000 595,000
Allowance for loan losses                      
Beginning balance         595,000     670,000 654,000 595,000 670,000
Chargeoffs                 611,000 688,000 415,000
Recoveries                 (24,000) (1,000) (1,000)
Provision for loan losses                 608,000 746,000 339,000
Ending balance 675,000 654,000             675,000 654,000 595,000
Ending balance specifically evaluated for impairment 54,000 0             54,000 0 91,000
Ending balance collectively evaluated for impairment 621,000 654,000             621,000 654,000 504,000
Related loan balances                      
Ending balance 91,549,000 99,082,000             91,549,000 99,082,000 105,244,000
Ending balance specifically evaluated for impairment 1,648,000 1,311,000             1,648,000 1,311,000 1,163,000
Ending balance collectively evaluated for impairment 89,901,000 97,771,000             89,901,000 97,771,000 104,081,000
Home equity line of credit | Specific Reserves Evaluated Individually for Impairment
                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Allowance for loan losses 54,000 0             54,000 0  
Allowance for loan losses                      
Ending balance 54,000 0             54,000 0  
Home equity line of credit | General Reserves Based on Historical Loss Experience
                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Allowance for loan losses 343,000 315,000             343,000 315,000  
Allowance for loan losses                      
Ending balance 343,000 315,000             343,000 315,000  
Home equity line of credit | Reserve for Qualitative Factors
                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Allowance for loan losses 278,000 339,000             278,000 339,000  
Allowance for loan losses                      
Ending balance 278,000 339,000             278,000 339,000  
Home equity line of credit | Unallocated Reserves
                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Allowance for loan losses 0 0             0 0  
Allowance for loan losses                      
Ending balance 0 0             0 0  
Consumer
                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Ending balance specifically evaluated for impairment 0 0             0 0 11,000
Allowance for loans evaluated collectively for impairment 573,000 592,000             573,000 592,000 573,000
Allowance for loan losses 573,000 592,000             573,000 592,000 584,000
Allowance for loan losses                      
Beginning balance         584,000     646,000 592,000 584,000 646,000
Chargeoffs                 430,000 555,000 381,000
Recoveries                 (183,000) (208,000) (222,000)
Provision for loan losses                 228,000 355,000 97,000
Ending balance 573,000 592,000             573,000 592,000 584,000
Ending balance specifically evaluated for impairment 0 0             0 0 11,000
Ending balance collectively evaluated for impairment 573,000 592,000             573,000 592,000 573,000
Related loan balances                      
Ending balance 15,066,000 14,657,000             15,066,000 14,657,000 16,788,000
Ending balance specifically evaluated for impairment 0 0             0 0 53,000
Ending balance collectively evaluated for impairment 15,066,000 14,657,000             15,066,000 14,657,000 16,735,000
Consumer | Specific Reserves Evaluated Individually for Impairment
                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Allowance for loan losses 0 0             0 0  
Allowance for loan losses                      
Ending balance 0 0             0 0  
Consumer | General Reserves Based on Historical Loss Experience
                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Allowance for loan losses 382,000 362,000             382,000 362,000  
Allowance for loan losses                      
Ending balance 382,000 362,000             382,000 362,000  
Consumer | Reserve for Qualitative Factors
                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Allowance for loan losses 191,000 230,000             191,000 230,000  
Allowance for loan losses                      
Ending balance 191,000 230,000             191,000 230,000  
Consumer | Unallocated Reserves
                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Allowance for loan losses 0 0             0 0  
Allowance for loan losses                      
Ending balance 0 0             0 0  
Unallocated Financing Receivables
                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Ending balance specifically evaluated for impairment 0 0             0 0 0
Allowance for loans evaluated collectively for impairment 1,678,000 842,000             1,678,000 842,000 2,008,000
Allowance for loan losses 1,678,000 842,000             1,678,000 842,000 2,008,000
Allowance for loan losses                      
Beginning balance         2,008,000     1,880,000 842,000 2,008,000 1,880,000
Chargeoffs                 0 0 0
Recoveries                 0 0 0
Provision for loan losses                 836,000 (1,166,000) 128,000
Ending balance 1,678,000 842,000             1,678,000 842,000 2,008,000
Ending balance specifically evaluated for impairment 0 0             0 0 0
Ending balance collectively evaluated for impairment 1,678,000 842,000             1,678,000 842,000 2,008,000
Related loan balances                      
Ending balance 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
Unallocated Financing Receivables | Specific Reserves Evaluated Individually for Impairment
                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Allowance for loan losses 0 0             0 0  
Allowance for loan losses                      
Ending balance 0 0             0 0  
Unallocated Financing Receivables | General Reserves Based on Historical Loss Experience
                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Allowance for loan losses 0 0             0 0  
Allowance for loan losses                      
Ending balance 0 0             0 0  
Unallocated Financing Receivables | Reserve for Qualitative Factors
                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Allowance for loan losses 0 0             0 0  
Allowance for loan losses                      
Ending balance 0 0             0 0  
Unallocated Financing Receivables | Unallocated Reserves
                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Allowance for loan losses 1,678,000 842,000             1,678,000 842,000  
Allowance for loan losses                      
Ending balance 1,678,000 842,000             1,678,000 842,000  
Minimum
                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Risk Based Ratios, Weighted-Average Required Reserve as Percent of Total Loans                 0.88%    
Regulatory Capital Requirements, Estimated Required Reserve                 10,000,000    
Maximum
                      
Financing Receivable, Allowance for Credit Losses [Line Items]                      
Risk Based Ratios, Weighted-Average Required Reserve as Percent of Total Loans                 1.60%    
Regulatory Capital Requirements, Estimated Required Reserve                 $ 13,000,000