- Summary of Activity in the Loan Balances and the Allowance for Loan Losses by Segment (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013
Allowance for loan losses:
Balance, beginning of period			$ 17,505	$ 17,637	$ 17,430		$ 17,815
Losses charged off	(857)	(1,354)	(2,888)	(4,449)
Recoveries	139	380	302	1,253
Provision charged to expense	720	950	2,513	3,350
Balance, end of period	17,432	17,791	17,432	17,791	17,430		17,815
Ending allowance balance attributable to loans:
Individually evaluated for impairment	886		886			938
Collectively evaluated for impairment	16,546		16,546			16,567
Total ending allowance balance	17,432	17,791	17,432	17,791	17,430		17,815
Loans:
Individually evaluated for impairment	17,874		17,874			21,511
Collectively evaluated for impairment	904,640		904,640			880,788
Total ending loans balance	922,514		922,514			902,299
Commercial real estate
Allowance for loan losses:
Balance, beginning of period			10,122	11,386	9,944		10,424
Losses charged off	(433)	(630)	(1,133)	(1,475)
Recoveries	11	83	32	584
Provision charged to expense	(407)	585	94	(33)
Balance, end of period	9,115	10,462	9,115	10,462	9,944		10,424
Ending allowance balance attributable to loans:
Individually evaluated for impairment	703		703			865
Collectively evaluated for impairment	8,412		8,412			9,257
Total ending allowance balance	9,115	10,462	9,115	10,462	9,944		10,424
Loans:
Individually evaluated for impairment	15,271		15,271			17,842
Collectively evaluated for impairment	398,354		398,354			383,749
Total ending loans balance	413,625		413,625			401,591
Commercial
Allowance for loan losses:
Balance, beginning of period			497	835	476		438
Losses charged off	(35)	0	(35)	(120)
Recoveries	30	2	32	7
Provision charged to expense	227	36	204	(246)
Balance, end of period	698	476	698	476	476		438
Ending allowance balance attributable to loans:
Individually evaluated for impairment	5		5			73
Collectively evaluated for impairment	693		693			424
Total ending allowance balance	698	476	698	476	476		438
Loans:
Individually evaluated for impairment	184		184			472
Collectively evaluated for impairment	85,359		85,359			88,174
Total ending loans balance	85,543		85,543			88,646
Residential Real Estate
Allowance for loan losses:
Balance, beginning of period			1,411	1,559	1,446		1,606
Losses charged off	(63)	(35)	(213)	(679)
Recoveries	0	178	6	277
Provision charged to expense	686	(311)	865	281
Balance, end of period	2,069	1,438	2,069	1,438	1,446		1,606
Ending allowance balance attributable to loans:
Individually evaluated for impairment	178		178			0
Collectively evaluated for impairment	1,891		1,891			1,411
Total ending allowance balance	2,069	1,438	2,069	1,438	1,446		1,606
Loans:
Individually evaluated for impairment	1,356		1,356			1,731
Collectively evaluated for impairment	69,535		69,535			64,776
Total ending loans balance	70,891		70,891			66,507
Home equity loans
Allowance for loan losses:
Balance, beginning of period			3,484	2,357	3,789		3,508
Losses charged off	(179)	(410)	(1,074)	(1,439)
Recoveries	46	5	65	60
Provision charged to expense	(537)	405	644	2,530
Balance, end of period	3,119	3,508	3,119	3,508	3,789		3,508
Ending allowance balance attributable to loans:
Individually evaluated for impairment	0		0			0
Collectively evaluated for impairment	3,119		3,119			3,484
Total ending allowance balance	3,119	3,508	3,119	3,508	3,789		3,508
Loans:
Individually evaluated for impairment	852		852			1,111
Collectively evaluated for impairment	124,466		124,466			121,965
Total ending loans balance	125,318		125,318			123,076
Indirect
Allowance for loan losses:
Balance, beginning of period			1,593	1,230	1,533		1,581
Losses charged off	(106)	(196)	(283)	(555)
Recoveries	46	104	143	276
Provision charged to expense	619	122	639	660
Balance, end of period	2,092	1,611	2,092	1,611	1,533		1,581
Ending allowance balance attributable to loans:
Individually evaluated for impairment	0		0			0
Collectively evaluated for impairment	2,092		2,092			1,593
Total ending allowance balance	2,092	1,611	2,092	1,611	1,533		1,581
Loans:
Individually evaluated for impairment	147		147			195
Collectively evaluated for impairment	213,303		213,303			206,128
Total ending loans balance	213,450		213,450			206,323
Consumer
Allowance for loan losses:
Balance, beginning of period			398	270	242		258
Losses charged off	(41)	(83)	(150)	(181)
Recoveries	6	8	24	49
Provision charged to expense	132	113	67	158
Balance, end of period	339	296	339	296	242		258
Ending allowance balance attributable to loans:
Individually evaluated for impairment	0		0			0
Collectively evaluated for impairment	339		339			398
Total ending allowance balance	339	296	339	296	242		258
Loans:
Individually evaluated for impairment	64		64			160
Collectively evaluated for impairment	13,623		13,623			15,996
Total ending loans balance	$ 13,687		$ 13,687			$ 16,156