Allowance for Loan Losses (Details) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loans Evaluated Individually for Impairment	$ 1,803,000				$ 2,461,000				$ 1,803,000	$ 2,461,000	$ 3,539,000
Allowance for Loans Evaluated Collectively for Impairment	8,541,000				9,053,000				8,541,000	9,053,000	8,961,000
Total Allowance for Loan Losses	10,344,000				11,514,000				10,344,000	11,514,000	12,500,000
Total Allowance for Loan Losses	10,344,000				11,514,000				10,344,000	11,514,000	12,500,000
Commercial and municipal risk-rated loans receivable	398,198,000				380,731,000				398,198,000	380,731,000
Allowance for loan losses
Beginning balance				11,514,000				12,500,000	11,514,000	12,500,000	13,000,000
Chargeoffs									3,495,000	5,855,000	9,080,000
Recoveries									1,175,000	669,000	745,000
Provision for loan losses	300,000	350,000	100,000	400,000	700,000	800,000	1,200,000	1,500,000	1,150,000	4,200,000	7,835,000
Ending balance	10,344,000				11,514,000				10,344,000	11,514,000	12,500,000
Ending balance specifically evaluated for impairment	1,803,000				2,461,000				1,803,000	2,461,000	3,539,000
Ending balance collectively evaluated for impairment	8,541,000				9,053,000				8,541,000	9,053,000	8,961,000
Related loan balances
Ending balance	917,564,000				876,367,000				917,564,000	876,367,000	869,284,000
Ending balance specifically evaluated for impairment	35,862,000				42,351,000				35,862,000	42,351,000	45,744,000
Ending balance collectively evaluated for impairment	881,702,000				834,016,000				881,702,000	834,016,000	823,540,000
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Allowance for Loan and Lease Losses, Related Loans, Percentage									0.39%	0.40%
Allowance for Loan and Lease Losses, Related Loans, Period Increase (Decrease)									128,000
Total Allowance for Loan Losses	10,344,000				11,514,000				10,344,000	11,514,000	12,500,000
Allowance for loan and lease losses unallocated portion, period increase (decrease)									16,000
Average loan growth									0.030
Other Real Estate, Average Percentage of Sales Price below Appraised Value									20.00%
Other Real Estate, Additional Discount Percentage to Calculate Allowances for Losses									20.00%
Risk Based Ratios, Weighted-Average Required Reserve as Percent of Total Loans										1.33%
Allowance for Loan Losses of Total Loans, Percentage	1.13%				1.31%				1.13%	1.31%
Commercial real estate loans maximum loan-to-value (in hundredths)	75.00%								75.00%
Construction loans actual loan portfolio-to-Company capital (in hundredths)	31.30%								31.30%
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)	94.70%								94.70%
Construction and non-owner-occupied commercial real estate loan portfolio loan-to-Company capital (in hundredths)	300.00%								300.00%
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
Strong 1
Financing Receivable, Allowance for Credit Losses [Line Items]
Commercial and municipal risk-rated loans receivable	342,000				281,000				342,000	281,000
Above Average 2
Financing Receivable, Allowance for Credit Losses [Line Items]
Commercial and municipal risk-rated loans receivable	39,438,000				38,318,000				39,438,000	38,318,000
Satisfactory 3
Financing Receivable, Allowance for Credit Losses [Line Items]
Commercial and municipal risk-rated loans receivable	78,125,000				63,823,000				78,125,000	63,823,000
Average 4
Financing Receivable, Allowance for Credit Losses [Line Items]
Commercial and municipal risk-rated loans receivable	176,959,000				161,073,000				176,959,000	161,073,000
Watch 5
Financing Receivable, Allowance for Credit Losses [Line Items]
Commercial and municipal risk-rated loans receivable	56,712,000				42,791,000				56,712,000	42,791,000
OAEM 6
Financing Receivable, Allowance for Credit Losses [Line Items]
Commercial and municipal risk-rated loans receivable	14,335,000				32,288,000				14,335,000	32,288,000
Substandard 7
Financing Receivable, Allowance for Credit Losses [Line Items]
Commercial and municipal risk-rated loans receivable	32,287,000				41,532,000				32,287,000	41,532,000
Doubtful 8
Financing Receivable, Allowance for Credit Losses [Line Items]
Commercial and municipal risk-rated loans receivable	0				625,000				0	625,000
Specific Reserves Evaluated Individually for Impairment
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Allowance for Loan Losses	1,803,000				2,461,000				1,803,000	2,461,000
Total Allowance for Loan Losses	1,803,000				2,461,000				1,803,000	2,461,000
Allowance for loan losses
Ending balance	1,803,000				2,461,000				1,803,000	2,461,000
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total Allowance for Loan Losses	1,803,000				2,461,000				1,803,000	2,461,000
General Reserves Based on Historical Loss Experience
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Allowance for Loan Losses	3,282,000				3,906,000				3,282,000	3,906,000
Total Allowance for Loan Losses	3,282,000				3,906,000				3,282,000	3,906,000
Allowance for loan losses
Ending balance	3,282,000				3,906,000				3,282,000	3,906,000
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total Allowance for Loan Losses	3,282,000				3,906,000				3,282,000	3,906,000
Reserve for Qualitative Factors
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Allowance for Loan Losses	3,597,000				3,469,000				3,597,000	3,469,000
Total Allowance for Loan Losses	3,597,000				3,469,000				3,597,000	3,469,000
Allowance for loan losses
Ending balance	3,597,000				3,469,000				3,597,000	3,469,000
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total Allowance for Loan Losses	3,597,000				3,469,000				3,597,000	3,469,000
Unallocated Reserves
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Allowance for Loan Losses	1,662,000				1,678,000				1,662,000	1,678,000
Total Allowance for Loan Losses	1,662,000				1,678,000				1,662,000	1,678,000
Allowance for loan losses
Ending balance	1,662,000				1,678,000				1,662,000	1,678,000
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total Allowance for Loan Losses	1,662,000				1,678,000				1,662,000	1,678,000
Percentage of Total Reserve Allowance accounted for by Loan Loss Allowances	16.10%				14.60%				16.10%	14.60%
Commercial Real Estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loans Evaluated Individually for Impairment	346,000				890,000				346,000	890,000	1,523,000
Allowance for Loans Evaluated Collectively for Impairment	3,186,000				3,712,000				3,186,000	3,712,000	4,342,000
Total Allowance for Loan Losses	3,532,000				4,602,000				3,532,000	4,602,000	5,865,000
Total Allowance for Loan Losses	3,532,000				4,602,000				3,532,000	4,602,000	5,865,000
Commercial and municipal risk-rated loans receivable	242,311,000				245,943,000				242,311,000	245,943,000
Allowance for loan losses
Beginning balance				4,602,000				5,865,000	4,602,000	5,865,000	5,659,000
Chargeoffs									1,205,000	150,000	1,394,000
Recoveries									144,000	0	13,000
Provision for loan losses									(9,000)	(1,113,000)	1,587,000
Ending balance	3,532,000				4,602,000				3,532,000	4,602,000	5,865,000
Ending balance specifically evaluated for impairment	346,000				890,000				346,000	890,000	1,523,000
Ending balance collectively evaluated for impairment	3,186,000				3,712,000				3,186,000	3,712,000	4,342,000
Related loan balances
Ending balance	242,311,000				245,943,000				242,311,000	245,943,000	251,335,000
Ending balance specifically evaluated for impairment	13,304,000				14,935,000				13,304,000	14,935,000	15,774,000
Ending balance collectively evaluated for impairment	229,007,000				231,008,000				229,007,000	231,008,000	235,561,000
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total Allowance for Loan Losses	3,532,000				4,602,000				3,532,000	4,602,000	5,865,000
Commercial Real Estate | Strong 1
Financing Receivable, Allowance for Credit Losses [Line Items]
Commercial and municipal risk-rated loans receivable	12,000				16,000				12,000	16,000
Commercial Real Estate | Above Average 2
Financing Receivable, Allowance for Credit Losses [Line Items]
Commercial and municipal risk-rated loans receivable	12,668,000				14,565,000				12,668,000	14,565,000
Commercial Real Estate | Satisfactory 3
Financing Receivable, Allowance for Credit Losses [Line Items]
Commercial and municipal risk-rated loans receivable	50,275,000				45,213,000				50,275,000	45,213,000
Commercial Real Estate | Average 4
Financing Receivable, Allowance for Credit Losses [Line Items]
Commercial and municipal risk-rated loans receivable	108,719,000				100,343,000				108,719,000	100,343,000
Commercial Real Estate | Watch 5
Financing Receivable, Allowance for Credit Losses [Line Items]
Commercial and municipal risk-rated loans receivable	36,974,000				32,326,000				36,974,000	32,326,000
Commercial Real Estate | OAEM 6
Financing Receivable, Allowance for Credit Losses [Line Items]
Commercial and municipal risk-rated loans receivable	9,846,000				26,102,000				9,846,000	26,102,000
Commercial Real Estate | Substandard 7
Financing Receivable, Allowance for Credit Losses [Line Items]
Commercial and municipal risk-rated loans receivable	23,817,000				27,115,000				23,817,000	27,115,000
Commercial Real Estate | Doubtful 8
Financing Receivable, Allowance for Credit Losses [Line Items]
Commercial and municipal risk-rated loans receivable	0				263,000				0	263,000
Commercial Real Estate | Specific Reserves Evaluated Individually for Impairment
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Allowance for Loan Losses	346,000				890,000				346,000	890,000
Total Allowance for Loan Losses	346,000				890,000				346,000	890,000
Allowance for loan losses
Ending balance	346,000				890,000				346,000	890,000
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total Allowance for Loan Losses	346,000				890,000				346,000	890,000
Commercial Real Estate | General Reserves Based on Historical Loss Experience
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Allowance for Loan Losses	1,444,000				1,927,000				1,444,000	1,927,000
Total Allowance for Loan Losses	1,444,000				1,927,000				1,444,000	1,927,000
Allowance for loan losses
Ending balance	1,444,000				1,927,000				1,444,000	1,927,000
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total Allowance for Loan Losses	1,444,000				1,927,000				1,444,000	1,927,000
Commercial Real Estate | Reserve for Qualitative Factors
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Allowance for Loan Losses	1,742,000				1,785,000				1,742,000	1,785,000
Total Allowance for Loan Losses	1,742,000				1,785,000				1,742,000	1,785,000
Allowance for loan losses
Ending balance	1,742,000				1,785,000				1,742,000	1,785,000
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total Allowance for Loan Losses	1,742,000				1,785,000				1,742,000	1,785,000
Commercial Real Estate | Unallocated Reserves
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Allowance for Loan Losses	0				0				0	0
Total Allowance for Loan Losses	0				0				0	0
Allowance for loan losses
Ending balance	0				0				0	0
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total Allowance for Loan Losses	0				0				0	0
Commercial Construction
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loans Evaluated Individually for Impairment	413,000				272,000				413,000	272,000	969,000
Allowance for Loans Evaluated Collectively for Impairment	410,000				303,000				410,000	303,000	390,000
Total Allowance for Loan Losses	823,000				575,000				823,000	575,000	1,359,000
Total Allowance for Loan Losses	823,000				575,000				823,000	575,000	1,359,000
Commercial and municipal risk-rated loans receivable	30,932,000				20,382,000				30,932,000	20,382,000
Allowance for loan losses
Beginning balance				575,000				1,359,000	575,000	1,359,000	658,000
Chargeoffs									0	963,000	928,000
Recoveries									0	0	246,000
Provision for loan losses									248,000	179,000	1,383,000
Ending balance	823,000				575,000				823,000	575,000	1,359,000
Ending balance specifically evaluated for impairment	413,000				272,000				413,000	272,000	969,000
Ending balance collectively evaluated for impairment	410,000				303,000				410,000	303,000	390,000
Related loan balances
Ending balance	30,932,000				20,382,000				30,932,000	20,382,000	22,417,000
Ending balance specifically evaluated for impairment	1,380,000				1,284,000				1,380,000	1,284,000	3,354,000
Ending balance collectively evaluated for impairment	29,552,000				19,098,000				29,552,000	19,098,000	19,063,000
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total Allowance for Loan Losses	823,000				575,000				823,000	575,000	1,359,000
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	771,000				804,000				771,000	804,000
Commercial Construction | Satisfactory 3
Financing Receivable, Allowance for Credit Losses [Line Items]
Commercial and municipal risk-rated loans receivable	1,983,000				871,000				1,983,000	871,000
Commercial Construction | Average 4
Financing Receivable, Allowance for Credit Losses [Line Items]
Commercial and municipal risk-rated loans receivable	23,345,000				14,938,000				23,345,000	14,938,000
Commercial Construction | Watch 5
Financing Receivable, Allowance for Credit Losses [Line Items]
Commercial and municipal risk-rated loans receivable	1,567,000				26,000				1,567,000	26,000
Commercial Construction | OAEM 6
Financing Receivable, Allowance for Credit Losses [Line Items]
Commercial and municipal risk-rated loans receivable	2,519,000				2,948,000				2,519,000	2,948,000
Commercial Construction | Substandard 7
Financing Receivable, Allowance for Credit Losses [Line Items]
Commercial and municipal risk-rated loans receivable	747,000				795,000				747,000	795,000
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]
Total Allowance for Loan Losses	413,000				272,000				413,000	272,000
Total Allowance for Loan Losses	413,000				272,000				413,000	272,000
Allowance for loan losses
Ending balance	413,000				272,000				413,000	272,000
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total Allowance for Loan Losses	413,000				272,000				413,000	272,000
Commercial Construction | General Reserves Based on Historical Loss Experience
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Allowance for Loan Losses	186,000				157,000				186,000	157,000
Total Allowance for Loan Losses	186,000				157,000				186,000	157,000
Allowance for loan losses
Ending balance	186,000				157,000				186,000	157,000
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total Allowance for Loan Losses	186,000				157,000				186,000	157,000
Commercial Construction | Reserve for Qualitative Factors
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Allowance for Loan Losses	224,000				146,000				224,000	146,000
Total Allowance for Loan Losses	224,000				146,000				224,000	146,000
Allowance for loan losses
Ending balance	224,000				146,000				224,000	146,000
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total Allowance for Loan Losses	224,000				146,000				224,000	146,000
Commercial Construction | Unallocated Reserves
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Allowance for Loan Losses	0				0				0	0
Total Allowance for Loan Losses	0				0				0	0
Allowance for loan losses
Ending balance	0				0				0	0
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total Allowance for Loan Losses	0				0				0	0
Commercial Other
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loans Evaluated Individually for Impairment	129,000				841,000				129,000	841,000	652,000
Allowance for Loans Evaluated Collectively for Impairment	1,376,000				1,435,000				1,376,000	1,435,000	1,398,000
Total Allowance for Loan Losses	1,505,000				2,276,000				1,505,000	2,276,000	2,050,000
Total Allowance for Loan Losses	1,505,000				2,276,000				1,505,000	2,276,000	2,050,000
Commercial and municipal risk-rated loans receivable	104,531,000				95,289,000				104,531,000	95,289,000
Allowance for loan losses
Beginning balance				2,276,000				2,050,000	2,276,000	2,050,000	2,063,000
Chargeoffs									989,000	2,583,000	3,215,000
Recoveries									758,000	359,000	113,000
Provision for loan losses									(540,000)	2,450,000	3,089,000
Ending balance	1,505,000				2,276,000				1,505,000	2,276,000	2,050,000
Ending balance specifically evaluated for impairment	129,000				841,000				129,000	841,000	652,000
Ending balance collectively evaluated for impairment	1,376,000				1,435,000				1,376,000	1,435,000	1,398,000
Related loan balances
Ending balance	104,531,000				95,289,000				104,531,000	95,289,000	81,183,000
Ending balance specifically evaluated for impairment	2,942,000				6,698,000				2,942,000	6,698,000	5,861,000
Ending balance collectively evaluated for impairment	101,589,000				88,591,000				101,589,000	88,591,000	75,322,000
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total Allowance for Loan Losses	1,505,000				2,276,000				1,505,000	2,276,000	2,050,000
Commercial Other | Strong 1
Financing Receivable, Allowance for Credit Losses [Line Items]
Commercial and municipal risk-rated loans receivable	330,000				265,000				330,000	265,000
Commercial Other | Above Average 2
Financing Receivable, Allowance for Credit Losses [Line Items]
Commercial and municipal risk-rated loans receivable	7,210,000				6,719,000				7,210,000	6,719,000
Commercial Other | Satisfactory 3
Financing Receivable, Allowance for Credit Losses [Line Items]
Commercial and municipal risk-rated loans receivable	24,232,000				14,852,000				24,232,000	14,852,000
Commercial Other | Average 4
Financing Receivable, Allowance for Credit Losses [Line Items]
Commercial and municipal risk-rated loans receivable	44,895,000				45,792,000				44,895,000	45,792,000
Commercial Other | Watch 5
Financing Receivable, Allowance for Credit Losses [Line Items]
Commercial and municipal risk-rated loans receivable	18,171,000				10,439,000				18,171,000	10,439,000
Commercial Other | OAEM 6
Financing Receivable, Allowance for Credit Losses [Line Items]
Commercial and municipal risk-rated loans receivable	1,970,000				3,238,000				1,970,000	3,238,000
Commercial Other | Substandard 7
Financing Receivable, Allowance for Credit Losses [Line Items]
Commercial and municipal risk-rated loans receivable	7,723,000				13,622,000				7,723,000	13,622,000
Commercial Other | Doubtful 8
Financing Receivable, Allowance for Credit Losses [Line Items]
Commercial and municipal risk-rated loans receivable	0				362,000				0	362,000
Commercial Other | Specific Reserves Evaluated Individually for Impairment
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Allowance for Loan Losses	129,000				841,000				129,000	841,000
Total Allowance for Loan Losses	129,000				841,000				129,000	841,000
Allowance for loan losses
Ending balance	129,000				841,000				129,000	841,000
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total Allowance for Loan Losses	129,000				841,000				129,000	841,000
Commercial Other | General Reserves Based on Historical Loss Experience
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Allowance for Loan Losses	624,000				745,000				624,000	745,000
Total Allowance for Loan Losses	624,000				745,000				624,000	745,000
Allowance for loan losses
Ending balance	624,000				745,000				624,000	745,000
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total Allowance for Loan Losses	624,000				745,000				624,000	745,000
Commercial Other | Reserve for Qualitative Factors
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Allowance for Loan Losses	752,000				690,000				752,000	690,000
Total Allowance for Loan Losses	752,000				690,000				752,000	690,000
Allowance for loan losses
Ending balance	752,000				690,000				752,000	690,000
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total Allowance for Loan Losses	752,000				690,000				752,000	690,000
Commercial Other | Unallocated Reserves
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Allowance for Loan Losses	0				0				0	0
Total Allowance for Loan Losses	0				0				0	0
Allowance for loan losses
Ending balance	0				0				0	0
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total Allowance for Loan Losses	0				0				0	0
Municipal
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loans Evaluated Individually for Impairment	0				0				0	0	0
Allowance for Loans Evaluated Collectively for Impairment	15,000				15,000				15,000	15,000	18,000
Total Allowance for Loan Losses	15,000				15,000				15,000	15,000	18,000
Total Allowance for Loan Losses	15,000				15,000				15,000	15,000	18,000
Commercial and municipal risk-rated loans receivable	20,424,000				19,117,000				20,424,000	19,117,000
Allowance for loan losses
Beginning balance				15,000				18,000	15,000	18,000	19,000
Chargeoffs									0	0	0
Recoveries									0	0	0
Provision for loan losses									0	(3,000)	(1,000)
Ending balance	15,000				15,000				15,000	15,000	18,000
Ending balance specifically evaluated for impairment	0				0				0	0	0
Ending balance collectively evaluated for impairment	15,000				15,000				15,000	15,000	18,000
Related loan balances
Ending balance	20,424,000				19,117,000				20,424,000	19,117,000	14,704,000
Ending balance specifically evaluated for impairment	0				0				0	0	0
Ending balance collectively evaluated for impairment	20,424,000				19,117,000				20,424,000	19,117,000	14,704,000
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total Allowance for Loan Losses	15,000				15,000				15,000	15,000	18,000
Municipal | Strong 1
Financing Receivable, Allowance for Credit Losses [Line Items]
Commercial and municipal risk-rated loans receivable	0				0				0	0
Municipal | Above Average 2
Financing Receivable, Allowance for Credit Losses [Line Items]
Commercial and municipal risk-rated loans receivable	18,789,000				16,230,000				18,789,000	16,230,000
Municipal | Satisfactory 3
Financing Receivable, Allowance for Credit Losses [Line Items]
Commercial and municipal risk-rated loans receivable	1,635,000				2,887,000				1,635,000	2,887,000
Municipal | Average 4
Financing Receivable, Allowance for Credit Losses [Line Items]
Commercial and municipal risk-rated loans receivable	0				0				0	0
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]
Total Allowance for Loan Losses	0				0				0	0
Total Allowance for Loan Losses	0				0				0	0
Allowance for loan losses
Ending balance	0				0				0	0
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total Allowance for Loan Losses	0				0				0	0
Municipal | General Reserves Based on Historical Loss Experience
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Allowance for Loan Losses	0				0				0	0
Total Allowance for Loan Losses	0				0				0	0
Allowance for loan losses
Ending balance	0				0				0	0
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total Allowance for Loan Losses	0				0				0	0
Municipal | Reserve for Qualitative Factors
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Allowance for Loan Losses	15,000				15,000				15,000	15,000
Total Allowance for Loan Losses	15,000				15,000				15,000	15,000
Allowance for loan losses
Ending balance	15,000				15,000				15,000	15,000
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total Allowance for Loan Losses	15,000				15,000				15,000	15,000
Municipal | Unallocated Reserves
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Allowance for Loan Losses	0				0				0	0
Total Allowance for Loan Losses	0				0				0	0
Allowance for loan losses
Ending balance	0				0				0	0
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total Allowance for Loan Losses	0				0				0	0
Residential Term
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loans Evaluated Individually for Impairment	519,000				404,000				519,000	404,000	395,000
Allowance for Loans Evaluated Collectively for Impairment	666,000				695,000				666,000	695,000	714,000
Total Allowance for Loan Losses	1,185,000				1,099,000				1,185,000	1,099,000	1,109,000
Total Allowance for Loan Losses	1,185,000				1,099,000				1,185,000	1,099,000	1,109,000
Allowance for loan losses
Beginning balance				1,099,000				1,109,000	1,099,000	1,109,000	1,159,000
Chargeoffs									699,000	1,118,000	1,911,000
Recoveries									36,000	103,000	110,000
Provision for loan losses									749,000	1,005,000	1,751,000
Ending balance	1,185,000				1,099,000				1,185,000	1,099,000	1,109,000
Ending balance specifically evaluated for impairment	519,000				404,000				519,000	404,000	395,000
Ending balance collectively evaluated for impairment	666,000				695,000				666,000	695,000	714,000
Related loan balances
Ending balance	384,032,000				377,218,000				384,032,000	377,218,000	379,447,000
Ending balance specifically evaluated for impairment	16,123,000				17,786,000				16,123,000	17,786,000	19,444,000
Ending balance collectively evaluated for impairment	367,909,000				359,432,000				367,909,000	359,432,000	360,003,000
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total Allowance for Loan Losses	1,185,000				1,099,000				1,185,000	1,099,000	1,109,000
Residential Term | Specific Reserves Evaluated Individually for Impairment
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Allowance for Loan Losses	519,000				404,000				519,000	404,000
Total Allowance for Loan Losses	519,000				404,000				519,000	404,000
Allowance for loan losses
Ending balance	519,000				404,000				519,000	404,000
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total Allowance for Loan Losses	519,000				404,000				519,000	404,000
Residential Term | General Reserves Based on Historical Loss Experience
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Allowance for Loan Losses	297,000				342,000				297,000	342,000
Total Allowance for Loan Losses	297,000				342,000				297,000	342,000
Allowance for loan losses
Ending balance	297,000				342,000				297,000	342,000
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total Allowance for Loan Losses	297,000				342,000				297,000	342,000
Residential Term | Reserve for Qualitative Factors
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Allowance for Loan Losses	369,000				353,000				369,000	353,000
Total Allowance for Loan Losses	369,000				353,000				369,000	353,000
Allowance for loan losses
Ending balance	369,000				353,000				369,000	353,000
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total Allowance for Loan Losses	369,000				353,000				369,000	353,000
Residential Term | Unallocated Reserves
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Allowance for Loan Losses	0				0				0	0
Total Allowance for Loan Losses	0				0				0	0
Allowance for loan losses
Ending balance	0				0				0	0
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total Allowance for Loan Losses	0				0				0	0
Residential Construction
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loans Evaluated Individually for Impairment	0				0				0	0	0
Allowance for Loans Evaluated Collectively for Impairment	20,000				21,000				20,000	21,000	11,000
Total Allowance for Loan Losses	20,000				21,000				20,000	21,000	11,000
Total Allowance for Loan Losses	20,000				21,000				20,000	21,000	11,000
Allowance for loan losses
Beginning balance				21,000				11,000	21,000	11,000	255,000
Chargeoffs									0	0	389,000
Recoveries									25,000	0	54,000
Provision for loan losses									(26,000)	10,000	91,000
Ending balance	20,000				21,000				20,000	21,000	11,000
Ending balance specifically evaluated for impairment	0				0				0	0	0
Ending balance collectively evaluated for impairment	20,000				21,000				20,000	21,000	11,000
Related loan balances
Ending balance	12,160,000				11,803,000				12,160,000	11,803,000	6,459,000
Ending balance specifically evaluated for impairment	0				0				0	0	0
Ending balance collectively evaluated for impairment	12,160,000				11,803,000				12,160,000	11,803,000	6,459,000
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total Allowance for Loan Losses	20,000				21,000				20,000	21,000	11,000
Residential Construction | Specific Reserves Evaluated Individually for Impairment
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Allowance for Loan Losses	0				0				0	0
Total Allowance for Loan Losses	0				0				0	0
Allowance for loan losses
Ending balance	0				0				0	0
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total Allowance for Loan Losses	0				0				0	0
Residential Construction | General Reserves Based on Historical Loss Experience
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Allowance for Loan Losses	9,000				10,000				9,000	10,000
Total Allowance for Loan Losses	9,000				10,000				9,000	10,000
Allowance for loan losses
Ending balance	9,000				10,000				9,000	10,000
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total Allowance for Loan Losses	9,000				10,000				9,000	10,000
Residential Construction | Reserve for Qualitative Factors
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Allowance for Loan Losses	11,000				11,000				11,000	11,000
Total Allowance for Loan Losses	11,000				11,000				11,000	11,000
Allowance for loan losses
Ending balance	11,000				11,000				11,000	11,000
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total Allowance for Loan Losses	11,000				11,000				11,000	11,000
Residential Construction | Unallocated Reserves
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Allowance for Loan Losses	0				0				0	0
Total Allowance for Loan Losses	0				0				0	0
Allowance for loan losses
Ending balance	0				0				0	0
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total Allowance for Loan Losses	0				0				0	0
Home equity line of credit
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loans Evaluated Individually for Impairment	396,000				54,000				396,000	54,000	0
Allowance for Loans Evaluated Collectively for Impairment	664,000				621,000				664,000	621,000	654,000
Total Allowance for Loan Losses	1,060,000				675,000				1,060,000	675,000	654,000
Total Allowance for Loan Losses	1,060,000				675,000				1,060,000	675,000	654,000
Allowance for loan losses
Beginning balance				675,000				654,000	675,000	654,000	595,000
Chargeoffs									153,000	611,000	688,000
Recoveries									16,000	24,000	1,000
Provision for loan losses									522,000	608,000	746,000
Ending balance	1,060,000				675,000				1,060,000	675,000	654,000
Ending balance specifically evaluated for impairment	396,000				54,000				396,000	54,000	0
Ending balance collectively evaluated for impairment	664,000				621,000				664,000	621,000	654,000
Related loan balances
Ending balance	103,521,000				91,549,000				103,521,000	91,549,000	99,082,000
Ending balance specifically evaluated for impairment	2,087,000				1,648,000				2,087,000	1,648,000	1,311,000
Ending balance collectively evaluated for impairment	101,434,000				89,901,000				101,434,000	89,901,000	97,771,000
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total Allowance for Loan Losses	1,060,000				675,000				1,060,000	675,000	654,000
Home equity line of credit | Specific Reserves Evaluated Individually for Impairment
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Allowance for Loan Losses	396,000				54,000				396,000	54,000
Total Allowance for Loan Losses	396,000				54,000				396,000	54,000
Allowance for loan losses
Ending balance	396,000				54,000				396,000	54,000
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total Allowance for Loan Losses	396,000				54,000				396,000	54,000
Home equity line of credit | General Reserves Based on Historical Loss Experience
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Allowance for Loan Losses	376,000				343,000				376,000	343,000
Total Allowance for Loan Losses	376,000				343,000				376,000	343,000
Allowance for loan losses
Ending balance	376,000				343,000				376,000	343,000
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total Allowance for Loan Losses	376,000				343,000				376,000	343,000
Home equity line of credit | Reserve for Qualitative Factors
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Allowance for Loan Losses	288,000				278,000				288,000	278,000
Total Allowance for Loan Losses	288,000				278,000				288,000	278,000
Allowance for loan losses
Ending balance	288,000				278,000				288,000	278,000
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total Allowance for Loan Losses	288,000				278,000				288,000	278,000
Home equity line of credit | Unallocated Reserves
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Allowance for Loan Losses	0				0				0	0
Total Allowance for Loan Losses	0				0				0	0
Allowance for loan losses
Ending balance	0				0				0	0
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total Allowance for Loan Losses	0				0				0	0
Consumer
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loans Evaluated Individually for Impairment	0				0				0	0	0
Allowance for Loans Evaluated Collectively for Impairment	542,000				573,000				542,000	573,000	592,000
Total Allowance for Loan Losses	542,000				573,000				542,000	573,000	592,000
Total Allowance for Loan Losses	542,000				573,000				542,000	573,000	592,000
Allowance for loan losses
Beginning balance				573,000				592,000	573,000	592,000	584,000
Chargeoffs									449,000	430,000	555,000
Recoveries									196,000	183,000	208,000
Provision for loan losses									222,000	228,000	355,000
Ending balance	542,000				573,000				542,000	573,000	592,000
Ending balance specifically evaluated for impairment	0				0				0	0	0
Ending balance collectively evaluated for impairment	542,000				573,000				542,000	573,000	592,000
Related loan balances
Ending balance	19,653,000				15,066,000				19,653,000	15,066,000	14,657,000
Ending balance specifically evaluated for impairment	26,000				0				26,000	0	0
Ending balance collectively evaluated for impairment	19,627,000				15,066,000				19,627,000	15,066,000	14,657,000
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total Allowance for Loan Losses	542,000				573,000				542,000	573,000	592,000
Consumer | Specific Reserves Evaluated Individually for Impairment
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Allowance for Loan Losses	0				0				0	0
Total Allowance for Loan Losses	0				0				0	0
Allowance for loan losses
Ending balance	0				0				0	0
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total Allowance for Loan Losses	0				0				0	0
Consumer | General Reserves Based on Historical Loss Experience
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Allowance for Loan Losses	346,000				382,000				346,000	382,000
Total Allowance for Loan Losses	346,000				382,000				346,000	382,000
Allowance for loan losses
Ending balance	346,000				382,000				346,000	382,000
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total Allowance for Loan Losses	346,000				382,000				346,000	382,000
Consumer | Reserve for Qualitative Factors
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Allowance for Loan Losses	196,000				191,000				196,000	191,000
Total Allowance for Loan Losses	196,000				191,000				196,000	191,000
Allowance for loan losses
Ending balance	196,000				191,000				196,000	191,000
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total Allowance for Loan Losses	196,000				191,000				196,000	191,000
Consumer | Unallocated Reserves
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Allowance for Loan Losses	0				0				0	0
Total Allowance for Loan Losses	0				0				0	0
Allowance for loan losses
Ending balance	0				0				0	0
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total Allowance for Loan Losses	0				0				0	0
Unallocated Financing Receivables
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loans Evaluated Individually for Impairment	0				0				0	0	0
Allowance for Loans Evaluated Collectively for Impairment	1,662,000				1,678,000				1,662,000	1,678,000	842,000
Total Allowance for Loan Losses	1,662,000				1,678,000				1,662,000	1,678,000	842,000
Total Allowance for Loan Losses	1,662,000				1,678,000				1,662,000	1,678,000	842,000
Allowance for loan losses
Beginning balance				1,678,000				842,000	1,678,000	842,000	2,008,000
Chargeoffs									0	0	0
Recoveries									0	0	0
Provision for loan losses									(16,000)	836,000	(1,166,000)
Ending balance	1,662,000				1,678,000				1,662,000	1,678,000	842,000
Ending balance specifically evaluated for impairment	0				0				0	0	0
Ending balance collectively evaluated for impairment	1,662,000				1,678,000				1,662,000	1,678,000	842,000
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
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total Allowance for Loan Losses	1,662,000				1,678,000				1,662,000	1,678,000	842,000
Unallocated Financing Receivables | Specific Reserves Evaluated Individually for Impairment
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Allowance for Loan Losses	0				0				0	0
Total Allowance for Loan Losses	0				0				0	0
Allowance for loan losses
Ending balance	0				0				0	0
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total Allowance for Loan Losses	0				0				0	0
Unallocated Financing Receivables | General Reserves Based on Historical Loss Experience
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Allowance for Loan Losses	0				0				0	0
Total Allowance for Loan Losses	0				0				0	0
Allowance for loan losses
Ending balance	0				0				0	0
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total Allowance for Loan Losses	0				0				0	0
Unallocated Financing Receivables | Reserve for Qualitative Factors
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Allowance for Loan Losses	0				0				0	0
Total Allowance for Loan Losses	0				0				0	0
Allowance for loan losses
Ending balance	0				0				0	0
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total Allowance for Loan Losses	0				0				0	0
Unallocated Financing Receivables | Unallocated Reserves
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Allowance for Loan Losses	1,662,000				1,678,000				1,662,000	1,678,000
Total Allowance for Loan Losses	1,662,000				1,678,000				1,662,000	1,678,000
Allowance for loan losses
Ending balance	1,662,000				1,678,000				1,662,000	1,678,000
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total Allowance for Loan Losses	1,662,000				1,678,000				1,662,000	1,678,000
Minimum
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Risk Based Ratios, Weighted-Average Required Reserve as Percent of Total Loans										0.88%
Regulatory Capital Requirements, Estimated Required Reserve										8,700,000.0
Maximum
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Risk Based Ratios, Weighted-Average Required Reserve as Percent of Total Loans										1.60%
Regulatory Capital Requirements, Estimated Required Reserve										$ 13,900,000.0