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Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loans Evaluated Individually for Impairment												$ 754	$ 1,803	$ 2,461
Allowance for Loans Evaluated Collectively for Impairment												9,162	8,541	9,053
Total Allowance for Loan Losses	$ 9,916			$ 10,344	$ 10,344			$ 11,514	$ 10,344	$ 11,514	$ 12,500	9,916	10,344	11,514
Total Allowance for Loan Losses	9,916			10,344	10,344			11,514	10,344	11,514	12,500	9,916	10,344	11,514
Commercial and municipal risk-rated loans receivable												442,435	398,198
Allowance for loan losses
Beginning balance				10,344				11,514	10,344	11,514	12,500
Chargeoffs									2,373	3,495	5,855
Recoveries									395	1,175	669
Provision (credit)	450	$ 200	$ 400	500	300	$ 350	$ 100	400	1,550	1,150	4,200
Ending balance	9,916				10,344				$ 9,916	$ 10,344	11,514
Ending balance specifically evaluated for impairment												754	1,803	2,461
Ending balance collectively evaluated for impairment												9,162	8,541	9,053
Related loan balances
Ending balance												988,638	917,564	876,367
Ending balance specifically evaluated for impairment												29,531	35,862	42,351
Ending balance collectively evaluated for impairment												959,107	881,702	834,016
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Qualitative portion of allowance for loan losses, as a percent of related loans									0.45%	0.39%
Increase in qualitative portion									$ 834
Total Allowance for Loan Losses	9,916			10,344	10,344			11,514	$ 10,344	$ 11,514	12,500	$ 9,916	$ 10,344	11,514
Allowance for loan losses as a percent of total loans												1.00%	1.13%
Commercial real estate loans maximum loan-to-value (in hundredths)												80.00%
Construction loans actual loan portfolio-to-Company capital (in hundredths)												23.10%
Construction loans maximum loan portfolio-to-Company capital (in hundredths)												100.00%
Construction and non-owner-occupied commercial real estate loan portfolio-to-Company Capital (in hundredths)												104.20%
Construction and non-owner-occupied commercial real estate loan portfolio loan-to-Company capital (in hundredths)												300.00%
Outstanding loans and commitments subject by independent consulting firm												50.00%
Residential loans typical loan-to-value range, low (in hundredths)												75.00%
Residential loans typical loan-to-value maximum (in hundredths)												80.00%
Collateralized consumer loans to individuals loan-to-value maximum range, low (in hundredths)												80.00%
Collateralized consumer loans to individuals loan-to-value maximum range, high (in hundredths)												90.00%
Delinquent period before consumer loans charged off (in days)									120 days
Delinquent period before residential loans placed on non-accrual status (in days)									90 days
1 Strong
Financing Receivable, Allowance for Credit Losses [Line Items]
Commercial and municipal risk-rated loans receivable												$ 1,262	$ 342
2 Above average
Financing Receivable, Allowance for Credit Losses [Line Items]
Commercial and municipal risk-rated loans receivable												55,059	39,438
3 Satisfactory
Financing Receivable, Allowance for Credit Losses [Line Items]
Commercial and municipal risk-rated loans receivable												85,095	78,125
4 Average
Financing Receivable, Allowance for Credit Losses [Line Items]
Commercial and municipal risk-rated loans receivable												207,442	176,959
5 Watch
Financing Receivable, Allowance for Credit Losses [Line Items]
Commercial and municipal risk-rated loans receivable												58,700	56,712
6 OAEM
Financing Receivable, Allowance for Credit Losses [Line Items]
Commercial and municipal risk-rated loans receivable												12,152	14,335
7 Substandard
Financing Receivable, Allowance for Credit Losses [Line Items]
Commercial and municipal risk-rated loans receivable												22,725	32,287
8 Doubtful
Financing Receivable, Allowance for Credit Losses [Line Items]
Commercial and municipal risk-rated loans receivable												0	0
Specific Reserves on Loans Evaluated Individually for Impairment
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Allowance for Loan Losses	754			1,803	1,803				$ 1,803	1,803		754	1,803
Total Allowance for Loan Losses	754			1,803	1,803				1,803	1,803		754	1,803
Allowance for loan losses
Beginning balance				1,803					1,803
Ending balance	754				1,803				754	1,803
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total Allowance for Loan Losses	754			1,803	1,803				1,803	1,803		754	1,803
General Reserves on Loans Based on Historical Loss Experience
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Allowance for Loan Losses	2,858			3,282	3,282				3,282	3,282		2,858	3,282
Total Allowance for Loan Losses	2,858			3,282	3,282				3,282	3,282		2,858	3,282
Allowance for loan losses
Beginning balance				3,282					3,282
Ending balance	2,858				3,282				2,858	3,282
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total Allowance for Loan Losses	2,858			3,282	3,282				3,282	3,282		2,858	3,282
Reserves for Qualitative Factors
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Allowance for Loan Losses	4,431			3,597	3,597				3,597	3,597		4,431	3,597
Total Allowance for Loan Losses	4,431			3,597	3,597				3,597	3,597		4,431	3,597
Allowance for loan losses
Beginning balance				3,597					3,597
Ending balance	4,431				3,597				4,431	3,597
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total Allowance for Loan Losses	4,431			3,597	3,597				3,597	3,597		4,431	3,597
Unallocated Reserves
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Allowance for Loan Losses	1,873			1,662	1,662				1,662	1,662		1,873	1,662
Total Allowance for Loan Losses	1,873			1,662	1,662				1,662	1,662		1,873	1,662
Allowance for loan losses
Beginning balance				1,662					1,662
Ending balance	1,873				1,662				1,873	1,662
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total Allowance for Loan Losses	1,873			1,662	1,662				1,662	1,662		$ 1,873	$ 1,662
Percent of total reserve												18.90%	16.10%
Commercial Real Estate
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loans Evaluated Individually for Impairment												$ 89	$ 346	890
Allowance for Loans Evaluated Collectively for Impairment												3,031	3,186	3,712
Total Allowance for Loan Losses	3,120			3,532	3,532			4,602	3,532	4,602	5,865	3,120	3,532	4,602
Total Allowance for Loan Losses	3,120			3,532	3,532			4,602	3,532	4,602	5,865	3,120	3,532	4,602
Commercial and municipal risk-rated loans receivable												269,462	242,311
Allowance for loan losses
Beginning balance				3,532				4,602	3,532	4,602	5,865
Chargeoffs									280	1,205	150
Recoveries									2	144	0
Provision (credit)									(134)	(9)	(1,113)
Ending balance	3,120				3,532				3,120	3,532	4,602
Ending balance specifically evaluated for impairment												89	346	890
Ending balance collectively evaluated for impairment												3,031	3,186	3,712
Related loan balances
Ending balance												269,462	242,311	245,943
Ending balance specifically evaluated for impairment												10,717	13,304	14,935
Ending balance collectively evaluated for impairment												258,745	229,007	231,008
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total Allowance for Loan Losses	3,120			3,532	3,532			4,602	3,532	4,602	5,865	3,120	3,532	4,602
Commercial Real Estate | 1 Strong
Financing Receivable, Allowance for Credit Losses [Line Items]
Commercial and municipal risk-rated loans receivable												6	12
Commercial Real Estate | 2 Above average
Financing Receivable, Allowance for Credit Losses [Line Items]
Commercial and municipal risk-rated loans receivable												29,176	12,668
Commercial Real Estate | 3 Satisfactory
Financing Receivable, Allowance for Credit Losses [Line Items]
Commercial and municipal risk-rated loans receivable												52,821	50,275
Commercial Real Estate | 4 Average
Financing Receivable, Allowance for Credit Losses [Line Items]
Commercial and municipal risk-rated loans receivable												122,071	108,719
Commercial Real Estate | 5 Watch
Financing Receivable, Allowance for Credit Losses [Line Items]
Commercial and municipal risk-rated loans receivable												36,075	36,974
Commercial Real Estate | 6 OAEM
Financing Receivable, Allowance for Credit Losses [Line Items]
Commercial and municipal risk-rated loans receivable												9,742	9,846
Commercial Real Estate | 7 Substandard
Financing Receivable, Allowance for Credit Losses [Line Items]
Commercial and municipal risk-rated loans receivable												19,571	23,817
Commercial Real Estate | 8 Doubtful
Financing Receivable, Allowance for Credit Losses [Line Items]
Commercial and municipal risk-rated loans receivable												0	0
Commercial Real Estate | Specific Reserves on Loans Evaluated Individually for Impairment
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Allowance for Loan Losses	89			346	346				346	346		89	346
Total Allowance for Loan Losses	89			346	346				346	346		89	346
Allowance for loan losses
Beginning balance				346					346
Ending balance	89				346				89	346
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total Allowance for Loan Losses	89			346	346				346	346		89	346
Commercial Real Estate | General Reserves on Loans Based on Historical Loss Experience
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Allowance for Loan Losses	893			1,444	1,444				1,444	1,444		893	1,444
Total Allowance for Loan Losses	893			1,444	1,444				1,444	1,444		893	1,444
Allowance for loan losses
Beginning balance				1,444					1,444
Ending balance	893				1,444				893	1,444
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total Allowance for Loan Losses	893			1,444	1,444				1,444	1,444		893	1,444
Commercial Real Estate | Reserves for Qualitative Factors
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Allowance for Loan Losses	2,138			1,742	1,742				1,742	1,742		2,138	1,742
Total Allowance for Loan Losses	2,138			1,742	1,742				1,742	1,742		2,138	1,742
Allowance for loan losses
Beginning balance				1,742					1,742
Ending balance	2,138				1,742				2,138	1,742
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total Allowance for Loan Losses	2,138			1,742	1,742				1,742	1,742		2,138	1,742
Commercial Real Estate | Unallocated Reserves
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Allowance for Loan Losses	0			0	0				0	0		0	0
Total Allowance for Loan Losses	0			0	0				0	0		0	0
Allowance for loan losses
Beginning balance				0					0
Ending balance	0				0				0	0
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total Allowance for Loan Losses	0			0	0				0	0		0	0
Commercial Construction
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loans Evaluated Individually for Impairment												302	413	272
Allowance for Loans Evaluated Collectively for Impairment												278	410	303
Total Allowance for Loan Losses	580			823	823			575	823	575	1,359	580	823	575
Total Allowance for Loan Losses	580			823	823			575	823	575	1,359	580	823	575
Commercial and municipal risk-rated loans receivable												24,881	30,932
Allowance for loan losses
Beginning balance				823				575	823	575	1,359
Chargeoffs									9	0	963
Recoveries									1	0	0
Provision (credit)									(235)	248	179
Ending balance	580				823				580	823	575
Ending balance specifically evaluated for impairment												302	413	272
Ending balance collectively evaluated for impairment												278	410	303
Related loan balances
Ending balance												24,881	30,932	20,382
Ending balance specifically evaluated for impairment												1,026	1,380	1,284
Ending balance collectively evaluated for impairment												23,855	29,552	19,098
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total Allowance for Loan Losses	580			823	823			575	823	575	1,359	580	823	575
Commercial Construction | 1 Strong
Financing Receivable, Allowance for Credit Losses [Line Items]
Commercial and municipal risk-rated loans receivable												0	0
Commercial Construction | 2 Above average
Financing Receivable, Allowance for Credit Losses [Line Items]
Commercial and municipal risk-rated loans receivable												56	771
Commercial Construction | 3 Satisfactory
Financing Receivable, Allowance for Credit Losses [Line Items]
Commercial and municipal risk-rated loans receivable												2,057	1,983
Commercial Construction | 4 Average
Financing Receivable, Allowance for Credit Losses [Line Items]
Commercial and municipal risk-rated loans receivable												18,070	23,345
Commercial Construction | 5 Watch
Financing Receivable, Allowance for Credit Losses [Line Items]
Commercial and municipal risk-rated loans receivable												4,490	1,567
Commercial Construction | 6 OAEM
Financing Receivable, Allowance for Credit Losses [Line Items]
Commercial and municipal risk-rated loans receivable												0	2,519
Commercial Construction | 7 Substandard
Financing Receivable, Allowance for Credit Losses [Line Items]
Commercial and municipal risk-rated loans receivable												208	747
Commercial Construction | 8 Doubtful
Financing Receivable, Allowance for Credit Losses [Line Items]
Commercial and municipal risk-rated loans receivable												0	0
Commercial Construction | Specific Reserves on Loans Evaluated Individually for Impairment
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Allowance for Loan Losses	302			413	413				413	413		302	413
Total Allowance for Loan Losses	302			413	413				413	413		302	413
Allowance for loan losses
Beginning balance				413					413
Ending balance	302				413				302	413
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total Allowance for Loan Losses	302			413	413				413	413		302	413
Commercial Construction | General Reserves on Loans Based on Historical Loss Experience
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Allowance for Loan Losses	82			186	186				186	186		82	186
Total Allowance for Loan Losses	82			186	186				186	186		82	186
Allowance for loan losses
Beginning balance				186					186
Ending balance	82				186				82	186
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total Allowance for Loan Losses	82			186	186				186	186		82	186
Commercial Construction | Reserves for Qualitative Factors
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Allowance for Loan Losses	196			224	224				224	224		196	224
Total Allowance for Loan Losses	196			224	224				224	224		196	224
Allowance for loan losses
Beginning balance				224					224
Ending balance	196				224				196	224
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total Allowance for Loan Losses	196			224	224				224	224		196	224
Commercial Construction | Unallocated Reserves
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Allowance for Loan Losses	0			0	0				0	0		0	0
Total Allowance for Loan Losses	0			0	0				0	0		0	0
Allowance for loan losses
Beginning balance				0					0
Ending balance	0				0				0	0
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total Allowance for Loan Losses	0			0	0				0	0		0	0
Commercial Other
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loans Evaluated Individually for Impairment												8	129	841
Allowance for Loans Evaluated Collectively for Impairment												1,444	1,376	1,435
Total Allowance for Loan Losses	1,452			1,505	1,505			2,276	1,505	2,276	2,050	1,452	1,505	2,276
Total Allowance for Loan Losses	1,452			1,505	1,505			2,276	1,505	2,276	2,050	1,452	1,505	2,276
Commercial and municipal risk-rated loans receivable												128,341	104,531
Allowance for loan losses
Beginning balance				1,505				2,276	1,505	2,276	2,050
Chargeoffs									732	989	2,583
Recoveries									88	758	359
Provision (credit)									591	(540)	2,450
Ending balance	1,452				1,505				1,452	1,505	2,276
Ending balance specifically evaluated for impairment												8	129	841
Ending balance collectively evaluated for impairment												1,444	1,376	1,435
Related loan balances
Ending balance												128,341	104,531	95,289
Ending balance specifically evaluated for impairment												1,234	2,942	6,698
Ending balance collectively evaluated for impairment												127,107	101,589	88,591
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total Allowance for Loan Losses	1,452			1,505	1,505			2,276	1,505	2,276	2,050	1,452	1,505	2,276
Commercial Other | 1 Strong
Financing Receivable, Allowance for Credit Losses [Line Items]
Commercial and municipal risk-rated loans receivable												1,256	330
Commercial Other | 2 Above average
Financing Receivable, Allowance for Credit Losses [Line Items]
Commercial and municipal risk-rated loans receivable												7,506	7,210
Commercial Other | 3 Satisfactory
Financing Receivable, Allowance for Credit Losses [Line Items]
Commercial and municipal risk-rated loans receivable												28,787	24,232
Commercial Other | 4 Average
Financing Receivable, Allowance for Credit Losses [Line Items]
Commercial and municipal risk-rated loans receivable												67,301	44,895
Commercial Other | 5 Watch
Financing Receivable, Allowance for Credit Losses [Line Items]
Commercial and municipal risk-rated loans receivable												18,135	18,171
Commercial Other | 6 OAEM
Financing Receivable, Allowance for Credit Losses [Line Items]
Commercial and municipal risk-rated loans receivable												2,410	1,970
Commercial Other | 7 Substandard
Financing Receivable, Allowance for Credit Losses [Line Items]
Commercial and municipal risk-rated loans receivable												2,946	7,723
Commercial Other | 8 Doubtful
Financing Receivable, Allowance for Credit Losses [Line Items]
Commercial and municipal risk-rated loans receivable												0	0
Commercial Other | Specific Reserves on Loans Evaluated Individually for Impairment
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Allowance for Loan Losses	8			129	129				129	129		8	129
Total Allowance for Loan Losses	8			129	129				129	129		8	129
Allowance for loan losses
Beginning balance				129					129
Ending balance	8				129				8	129
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total Allowance for Loan Losses	8			129	129				129	129		8	129
Commercial Other | General Reserves on Loans Based on Historical Loss Experience
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Allowance for Loan Losses	425			624	624				624	624		425	624
Total Allowance for Loan Losses	425			624	624				624	624		425	624
Allowance for loan losses
Beginning balance				624					624
Ending balance	425				624				425	624
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total Allowance for Loan Losses	425			624	624				624	624		425	624
Commercial Other | Reserves for Qualitative Factors
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Allowance for Loan Losses	1,019			752	752				752	752		1,019	752
Total Allowance for Loan Losses	1,019			752	752				752	752		1,019	752
Allowance for loan losses
Beginning balance				752					752
Ending balance	1,019				752				1,019	752
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total Allowance for Loan Losses	1,019			752	752				752	752		1,019	752
Commercial Other | Unallocated Reserves
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Allowance for Loan Losses	0			0	0				0	0		0	0
Total Allowance for Loan Losses	0			0	0				0	0		0	0
Allowance for loan losses
Beginning balance				0					0
Ending balance	0				0				0	0
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total Allowance for Loan Losses	0			0	0				0	0		0	0
Municipal
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loans Evaluated Individually for Impairment												0	0	0
Allowance for Loans Evaluated Collectively for Impairment												17	15	15
Total Allowance for Loan Losses	17			15	15			15	15	15	18	17	15	15
Total Allowance for Loan Losses	17			15	15			15	15	15	18	17	15	15
Commercial and municipal risk-rated loans receivable												19,751	20,424
Allowance for loan losses
Beginning balance				15				15	15	15	18
Chargeoffs									0	0	0
Recoveries									0	0	0
Provision (credit)									2	0	(3)
Ending balance	17				15				17	15	15
Ending balance specifically evaluated for impairment												0	0	0
Ending balance collectively evaluated for impairment												17	15	15
Related loan balances
Ending balance												19,751	20,424	19,117
Ending balance specifically evaluated for impairment												0	0	0
Ending balance collectively evaluated for impairment												19,751	20,424	19,117
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total Allowance for Loan Losses	17			15	15			15	15	15	18	17	15	15
Municipal | 1 Strong
Financing Receivable, Allowance for Credit Losses [Line Items]
Commercial and municipal risk-rated loans receivable												0	0
Municipal | 2 Above average
Financing Receivable, Allowance for Credit Losses [Line Items]
Commercial and municipal risk-rated loans receivable												18,321	18,789
Municipal | 3 Satisfactory
Financing Receivable, Allowance for Credit Losses [Line Items]
Commercial and municipal risk-rated loans receivable												1,430	1,635
Municipal | 4 Average
Financing Receivable, Allowance for Credit Losses [Line Items]
Commercial and municipal risk-rated loans receivable												0	0
Municipal | 5 Watch
Financing Receivable, Allowance for Credit Losses [Line Items]
Commercial and municipal risk-rated loans receivable												0	0
Municipal | 6 OAEM
Financing Receivable, Allowance for Credit Losses [Line Items]
Commercial and municipal risk-rated loans receivable												0	0
Municipal | 7 Substandard
Financing Receivable, Allowance for Credit Losses [Line Items]
Commercial and municipal risk-rated loans receivable												0	0
Municipal | 8 Doubtful
Financing Receivable, Allowance for Credit Losses [Line Items]
Commercial and municipal risk-rated loans receivable												0	0
Municipal | Specific Reserves on Loans Evaluated Individually for Impairment
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Allowance for Loan Losses	0			0	0				0	0		0	0
Total Allowance for Loan Losses	0			0	0				0	0		0	0
Allowance for loan losses
Beginning balance				0					0
Ending balance	0				0				0	0
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total Allowance for Loan Losses	0			0	0				0	0		0	0
Municipal | General Reserves on Loans Based on Historical Loss Experience
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Allowance for Loan Losses	0			0	0				0	0		0	0
Total Allowance for Loan Losses	0			0	0				0	0		0	0
Allowance for loan losses
Beginning balance				0					0
Ending balance	0				0				0	0
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total Allowance for Loan Losses	0			0	0				0	0		0	0
Municipal | Reserves for Qualitative Factors
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Allowance for Loan Losses	17			15	15				15	15		17	15
Total Allowance for Loan Losses	17			15	15				15	15		17	15
Allowance for loan losses
Beginning balance				15					15
Ending balance	17				15				17	15
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total Allowance for Loan Losses	17			15	15				15	15		17	15
Municipal | Unallocated Reserves
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Allowance for Loan Losses	0			0	0				0	0		0	0
Total Allowance for Loan Losses	0			0	0				0	0		0	0
Allowance for loan losses
Beginning balance				0					0
Ending balance	0				0				0	0
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total Allowance for Loan Losses	0			0	0				0	0		0	0
Residential Term
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loans Evaluated Individually for Impairment												326	519	404
Allowance for Loans Evaluated Collectively for Impairment												1,065	666	695
Total Allowance for Loan Losses	1,391			1,185	1,185			1,099	1,185	1,099	1,109	1,391	1,185	1,099
Total Allowance for Loan Losses	1,391			1,185	1,185			1,099	1,185	1,099	1,109	1,391	1,185	1,099
Allowance for loan losses
Beginning balance				1,185				1,099	1,185	1,099	1,109
Chargeoffs									420	699	1,118
Recoveries									152	36	103
Provision (credit)									474	749	1,005
Ending balance	1,391				1,185				1,391	1,185	1,099
Ending balance specifically evaluated for impairment												326	519	404
Ending balance collectively evaluated for impairment												1,065	666	695
Related loan balances
Ending balance												403,030	384,032	377,218
Ending balance specifically evaluated for impairment												15,088	16,123	17,786
Ending balance collectively evaluated for impairment												387,942	367,909	359,432
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total Allowance for Loan Losses	1,391			1,185	1,185			1,099	1,185	1,099	1,109	1,391	1,185	1,099
Residential Term | Specific Reserves on Loans Evaluated Individually for Impairment
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Allowance for Loan Losses	326			519	519				519	519		326	519
Total Allowance for Loan Losses	326			519	519				519	519		326	519
Allowance for loan losses
Beginning balance				519					519
Ending balance	326				519				326	519
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total Allowance for Loan Losses	326			519	519				519	519		326	519
Residential Term | General Reserves on Loans Based on Historical Loss Experience
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Allowance for Loan Losses	613			297	297				297	297		613	297
Total Allowance for Loan Losses	613			297	297				297	297		613	297
Allowance for loan losses
Beginning balance				297					297
Ending balance	613				297				613	297
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total Allowance for Loan Losses	613			297	297				297	297		613	297
Residential Term | Reserves for Qualitative Factors
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Allowance for Loan Losses	452			369	369				369	369		452	369
Total Allowance for Loan Losses	452			369	369				369	369		452	369
Allowance for loan losses
Beginning balance				369					369
Ending balance	452				369				452	369
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total Allowance for Loan Losses	452			369	369				369	369		452	369
Residential Term | Unallocated Reserves
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Allowance for Loan Losses	0			0	0				0	0		0	0
Total Allowance for Loan Losses	0			0	0				0	0		0	0
Allowance for loan losses
Beginning balance				0					0
Ending balance	0				0				0	0
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total Allowance for Loan Losses	0			0	0				0	0		0	0
Residential Construction
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loans Evaluated Individually for Impairment												0	0	0
Allowance for Loans Evaluated Collectively for Impairment												24	20	21
Total Allowance for Loan Losses	24			20	20			21	20	21	11	24	20	21
Total Allowance for Loan Losses	24			20	20			21	20	21	11	24	20	21
Allowance for loan losses
Beginning balance				20				21	20	21	11
Chargeoffs									0	0	0
Recoveries									0	25	0
Provision (credit)									4	(26)	10
Ending balance	24				20				24	20	21
Ending balance specifically evaluated for impairment												0	0	0
Ending balance collectively evaluated for impairment												24	20	21
Related loan balances
Ending balance												8,451	12,160	11,803
Ending balance specifically evaluated for impairment												0	0	0
Ending balance collectively evaluated for impairment												8,451	12,160	11,803
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total Allowance for Loan Losses	24			20	20			21	20	21	11	24	20	21
Residential Construction | Specific Reserves on Loans Evaluated Individually for Impairment
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Allowance for Loan Losses	0			0	0				0	0		0	0
Total Allowance for Loan Losses	0			0	0				0	0		0	0
Allowance for loan losses
Beginning balance				0					0
Ending balance	0				0				0	0
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total Allowance for Loan Losses	0			0	0				0	0		0	0
Residential Construction | General Reserves on Loans Based on Historical Loss Experience
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Allowance for Loan Losses	14			9	9				9	9		14	9
Total Allowance for Loan Losses	14			9	9				9	9		14	9
Allowance for loan losses
Beginning balance				9					9
Ending balance	14				9				14	9
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total Allowance for Loan Losses	14			9	9				9	9		14	9
Residential Construction | Reserves for Qualitative Factors
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Allowance for Loan Losses	10			11	11				11	11		10	11
Total Allowance for Loan Losses	10			11	11				11	11		10	11
Allowance for loan losses
Beginning balance				11					11
Ending balance	10				11				10	11
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total Allowance for Loan Losses	10			11	11				11	11		10	11
Residential Construction | Unallocated Reserves
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Allowance for Loan Losses	0			0	0				0	0		0	0
Total Allowance for Loan Losses	0			0	0				0	0		0	0
Allowance for loan losses
Beginning balance				0					0
Ending balance	0				0				0	0
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total Allowance for Loan Losses	0			0	0				0	0		0	0
Home equity line of credit
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loans Evaluated Individually for Impairment												29	396	54
Allowance for Loans Evaluated Collectively for Impairment												864	664	621
Total Allowance for Loan Losses	893			1,060	1,060			675	1,060	675	654	893	1,060	675
Total Allowance for Loan Losses	893			1,060	1,060			675	1,060	675	654	893	1,060	675
Allowance for loan losses
Beginning balance				1,060				675	1,060	675	654
Chargeoffs									582	153	611
Recoveries									31	16	24
Provision (credit)									384	522	608
Ending balance	893				1,060				893	1,060	675
Ending balance specifically evaluated for impairment												29	396	54
Ending balance collectively evaluated for impairment												864	664	621
Related loan balances
Ending balance												110,202	103,521	91,549
Ending balance specifically evaluated for impairment												1,466	2,087	1,648
Ending balance collectively evaluated for impairment												108,736	101,434	89,901
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total Allowance for Loan Losses	893			1,060	1,060			675	1,060	675	654	893	1,060	675
Home equity line of credit | Specific Reserves on Loans Evaluated Individually for Impairment
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Allowance for Loan Losses	29			396	396				396	396		29	396
Total Allowance for Loan Losses	29			396	396				396	396		29	396
Allowance for loan losses
Beginning balance				396					396
Ending balance	29				396				29	396
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total Allowance for Loan Losses	29			396	396				396	396		29	396
Home equity line of credit | General Reserves on Loans Based on Historical Loss Experience
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Allowance for Loan Losses	500			376	376				376	376		500	376
Total Allowance for Loan Losses	500			376	376				376	376		500	376
Allowance for loan losses
Beginning balance				376					376
Ending balance	500				376				500	376
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total Allowance for Loan Losses	500			376	376				376	376		500	376
Home equity line of credit | Reserves for Qualitative Factors
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Allowance for Loan Losses	364			288	288				288	288		364	288
Total Allowance for Loan Losses	364			288	288				288	288		364	288
Allowance for loan losses
Beginning balance				288					288
Ending balance	364				288				364	288
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total Allowance for Loan Losses	364			288	288				288	288		364	288
Home equity line of credit | Unallocated Reserves
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Allowance for Loan Losses	0			0	0				0	0		0	0
Total Allowance for Loan Losses	0			0	0				0	0		0	0
Allowance for loan losses
Beginning balance				0					0
Ending balance	0				0				0	0
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total Allowance for Loan Losses	0			0	0				0	0		0	0
Consumer
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for Loans Evaluated Individually for Impairment												0	0	0
Allowance for Loans Evaluated Collectively for Impairment												566	542	573
Total Allowance for Loan Losses	566			542	542			573	542	573	592	566	542	573
Total Allowance for Loan Losses	566			542	542			573	542	573	592	566	542	573
Allowance for loan losses
Beginning balance				542				573	542	573	592
Chargeoffs									350	449	430
Recoveries									121	196	183
Provision (credit)									253	222	228
Ending balance	566				542				566	542	573
Ending balance specifically evaluated for impairment												0	0	0
Ending balance collectively evaluated for impairment												566	542	573
Related loan balances
Ending balance												24,520	19,653	15,066
Ending balance specifically evaluated for impairment												0	26	0
Ending balance collectively evaluated for impairment												24,520	19,627	15,066
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total Allowance for Loan Losses	566			542	542			573	542	573	592	566	542	573
Consumer | Specific Reserves on Loans Evaluated Individually for Impairment
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Allowance for Loan Losses	0			0	0				0	0		0	0
Total Allowance for Loan Losses	0			0	0				0	0		0	0
Allowance for loan losses
Beginning balance				0					0
Ending balance	0				0				0	0
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total Allowance for Loan Losses	0			0	0				0	0		0	0
Consumer | General Reserves on Loans Based on Historical Loss Experience
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Allowance for Loan Losses	331			346	346				346	346		331	346
Total Allowance for Loan Losses	331			346	346				346	346		331	346
Allowance for loan losses
Beginning balance				346					346
Ending balance	331				346				331	346
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total Allowance for Loan Losses	331			346	346				346	346		331	346
Consumer | Reserves for Qualitative Factors
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Allowance for Loan Losses	235			196	196				196	196		235	196
Total Allowance for Loan Losses	235			196	196				196	196		235	196
Allowance for loan losses
Beginning balance				196					196
Ending balance	235				196				235	196
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total Allowance for Loan Losses	235			196	196				196	196		235	196
Consumer | Unallocated Reserves
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Allowance for Loan Losses	0			0	0				0	0		0	0
Total Allowance for Loan Losses	0			0	0				0	0		0	0
Allowance for loan losses
Beginning balance				0					0
Ending balance	0				0				0	0
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total Allowance for Loan Losses	0			0	0				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
Allowance for Loans Evaluated Collectively for Impairment												1,873	1,662	1,678
Total Allowance for Loan Losses	1,873			1,662	1,662			1,678	1,662	1,678	842	1,873	1,662	1,678
Total Allowance for Loan Losses	1,873			1,662	1,662			1,678	1,662	1,678	842	1,873	1,662	1,678
Allowance for loan losses
Beginning balance				1,662				1,678	1,662	1,678	842
Chargeoffs									0	0	0
Recoveries									0	0	0
Provision (credit)									211	(16)	836
Ending balance	1,873				1,662				1,873	1,662	1,678
Ending balance specifically evaluated for impairment												0	0	0
Ending balance collectively evaluated for impairment												1,873	1,662	1,678
Related loan balances
Ending balance												0	0	0
Ending balance specifically evaluated for impairment												0	0	0
Ending balance collectively evaluated for impairment												0	0	0
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total Allowance for Loan Losses	1,873			1,662	1,662			$ 1,678	1,662	1,678	$ 842	1,873	1,662	$ 1,678
Unallocated Financing Receivables | Specific Reserves on Loans Evaluated Individually for Impairment
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Allowance for Loan Losses	0			0	0				0	0		0	0
Total Allowance for Loan Losses	0			0	0				0	0		0	0
Allowance for loan losses
Beginning balance				0					0
Ending balance	0				0				0	0
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total Allowance for Loan Losses	0			0	0				0	0		0	0
Unallocated Financing Receivables | General Reserves on Loans Based on Historical Loss Experience
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Allowance for Loan Losses	0			0	0				0	0		0	0
Total Allowance for Loan Losses	0			0	0				0	0		0	0
Allowance for loan losses
Beginning balance				0					0
Ending balance	0				0				0	0
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total Allowance for Loan Losses	0			0	0				0	0		0	0
Unallocated Financing Receivables | Reserves for Qualitative Factors
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Allowance for Loan Losses	0			0	0				0	0		0	0
Total Allowance for Loan Losses	0			0	0				0	0		0	0
Allowance for loan losses
Beginning balance				0					0
Ending balance	0				0				0	0
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total Allowance for Loan Losses	0			0	0				0	0		0	0
Unallocated Financing Receivables | Unallocated Reserves
Financing Receivable, Allowance for Credit Losses [Line Items]
Total Allowance for Loan Losses	1,873			1,662	1,662				1,662	1,662		1,873	1,662
Total Allowance for Loan Losses	1,873			1,662	1,662				1,662	1,662		1,873	1,662
Allowance for loan losses
Beginning balance				1,662					1,662
Ending balance	1,873				1,662				1,873	1,662
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total Allowance for Loan Losses	$ 1,873			$ 1,662	$ 1,662				$ 1,662	$ 1,662		$ 1,873	$ 1,662

X

- Definition

Allowance for Loan Losses of Total Loans, Percentage

+ References

No definition available.

+ Details

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Balance Type:	na
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X

- Definition

Allowance for Loan and Lease Losses, Related Loans, Percentage

+ References

No definition available.

+ Details

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Period Type:	duration

X

- Definition

Allowance for Loan and Lease Losses, Related Loans, Period Increase (Decrease)

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The high maximum percentage of loan to value for consumer loans based on purchase price of the collateral.

+ References

No definition available.

+ Details

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Namespace Prefix:	fnlc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The low maximum percentage of loan to value for consumer loans based on purchase price of the collateral.

+ References

No definition available.

+ Details

Name:	fnlc_CollateralizedConsumerLoansToIndividualsLoanToValueMaximumRangeLow
Namespace Prefix:	fnlc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Loans subject to review and validation annually by independent consulting firm as well internal credit review function.

+ References

No definition available.

+ Details

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Namespace Prefix:	fnlc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The maximum percentage of loan to value for commercial real estate loans based on current appraisal information.

+ References

No definition available.

+ Details

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Namespace Prefix:	fnlc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The regulatory maximum allowed ratio of loan portfolio to Company capital for construction and non-owner-occupied commercial real estate.

+ References

No definition available.

+ Details

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Namespace Prefix:	fnlc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The actual ratio of loan amount to Company capital for construction and non-owner-occupied commercial real estate.

+ References

No definition available.

+ Details

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Namespace Prefix:	fnlc_
Data Type:	num:percentItemType
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Period Type:	instant

X

- Definition

The regulatory maximum allowed ratio of loan portfolio to Company capital for construction loans.

+ References

No definition available.

+ Details

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Namespace Prefix:	fnlc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

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- Definition

The ratio of loan portfolio to Company capital for construction loans .

+ References

No definition available.

+ Details

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Namespace Prefix:	fnlc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

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- Definition

The minimum amount of days past due at which residential loans are placed on non-accrual status..

+ References

No definition available.

+ Details

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Namespace Prefix:	fnlc_
Data Type:	xbrli:durationItemType
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Period Type:	duration

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- Definition

The minimum amount of days past due at which loans are considered charged off.

+ References

No definition available.

+ Details

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Namespace Prefix:	fnlc_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Percentage of loans and commitments subject to review by an independent consulting firm each year.

+ References

No definition available.

+ Details

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Namespace Prefix:	fnlc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Percentage of Total Reserve Allowance accounted for by Loan Loss Allowances

+ References

No definition available.

+ Details

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

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- Definition

-- None. No documentation exists for this element. --

+ References

No definition available.

+ Details

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Namespace Prefix:	fnlc_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Definition

The high percentage of loan to value range for residential loans based on current appraisal information.

+ References

No definition available.

+ Details

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Namespace Prefix:	fnlc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The low percentage of loan to value range for residential loans based on current appraisal information.

+ References

No definition available.

+ Details

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Namespace Prefix:	fnlc_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Amount of recovery of loans and lease receivables which had previously been fully or partially written-off as bad debts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (c)(4)
-URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953423-111524

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Period Type:	duration

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

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- Definition

Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (c)(3)
-URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953423-111524

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.7(d))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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Balance Type:	debit
Period Type:	duration

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- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Definition

The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
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