Loans and Allowance for Loan Losses (Details 3) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Analysis of changes in the allowance for loan losses
Balance at beginning of period	$ 5,194	$ 5,202
Loan charge-offs	(39)	(35)
Recoveries	25	38
Net loan recoveries (charge-offs)	(14)	3
Provision charged to operations		160
Balance at end of period	5,180	5,365
Commercial
Analysis of changes in the allowance for loan losses
Balance at beginning of period	1,977	2,064
Recoveries		1
Net loan recoveries (charge-offs)		1
Provision charged to operations	8	(75)
Balance at end of period	1,985	1,990
Commercial real estate
Analysis of changes in the allowance for loan losses
Balance at beginning of period	2,926	2,754
Recoveries	1
Net loan recoveries (charge-offs)	1
Provision charged to operations	(24)	229
Balance at end of period	2,903	2,983
Residential real estate
Analysis of changes in the allowance for loan losses
Balance at beginning of period	153	229
Loan charge-offs		(2)
Recoveries		11
Net loan recoveries (charge-offs)		9
Provision charged to operations	1	(7)
Balance at end of period	154	231
Consumer | Home equity
Analysis of changes in the allowance for loan losses
Balance at beginning of period	52	60
Recoveries	4	5
Net loan recoveries (charge-offs)	4	5
Provision charged to operations	(3)	(1)
Balance at end of period	53	64
Consumer | Other
Analysis of changes in the allowance for loan losses
Balance at beginning of period	86	95
Loan charge-offs	(39)	(33)
Recoveries	20	21
Net loan recoveries (charge-offs)	(19)	(12)
Provision charged to operations	18	14
Balance at end of period	$ 85	$ 97