Loans, Net - Summary of loan classifications by class of loan (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015	Sep. 30, 2015
Summary of loan classifications by class of loan [Abstract]
Summary of loan quality by class of loan	$ 845,890	$ 805,681	$ 780,867
Pass [Member]
Summary of loan classifications by class of loan [Abstract]
Summary of loan quality by class of loan	806,025	756,048
Special Mention [Member]
Summary of loan classifications by class of loan [Abstract]
Summary of loan quality by class of loan	11,878	20,854
Substandard [Member]
Summary of loan classifications by class of loan [Abstract]
Summary of loan quality by class of loan	26,267	25,920
Doubtful [Member]
Summary of loan classifications by class of loan [Abstract]
Summary of loan quality by class of loan	1,621	2,858
Loss [Member]
Summary of loan classifications by class of loan [Abstract]
Summary of loan quality by class of loan	99	1
Construction [Member]
Summary of loan classifications by class of loan [Abstract]
Summary of loan quality by class of loan	32,519	39,673	33,381
Construction [Member] | Pass [Member]
Summary of loan classifications by class of loan [Abstract]
Summary of loan quality by class of loan	26,934	30,114
Construction [Member] | Special Mention [Member]
Summary of loan classifications by class of loan [Abstract]
Summary of loan quality by class of loan	5,556	9,024
Construction [Member] | Substandard [Member]
Summary of loan classifications by class of loan [Abstract]
Summary of loan quality by class of loan	29	535
Construction [Member] | Doubtful [Member]
Summary of loan classifications by class of loan [Abstract]
Summary of loan quality by class of loan	0	0
Construction [Member] | Loss [Member]
Summary of loan classifications by class of loan [Abstract]
Summary of loan quality by class of loan	0	0
Secured by farmland [Member]
Summary of loan classifications by class of loan [Abstract]
Summary of loan quality by class of loan	16,832	19,062
Secured by farmland [Member] | Pass [Member]
Summary of loan classifications by class of loan [Abstract]
Summary of loan quality by class of loan	8,901	10,566
Secured by farmland [Member] | Special Mention [Member]
Summary of loan classifications by class of loan [Abstract]
Summary of loan quality by class of loan	0	0
Secured by farmland [Member] | Substandard [Member]
Summary of loan classifications by class of loan [Abstract]
Summary of loan quality by class of loan	7,931	8,496
Secured by farmland [Member] | Doubtful [Member]
Summary of loan classifications by class of loan [Abstract]
Summary of loan quality by class of loan	0	0
Secured by farmland [Member] | Loss [Member]
Summary of loan classifications by class of loan [Abstract]
Summary of loan quality by class of loan	0	0
Secured by 1-4 family residential [Member]
Summary of loan classifications by class of loan [Abstract]
Summary of loan quality by class of loan	332,408	280,096	273,176
Secured by 1-4 family residential [Member] | Pass [Member]
Summary of loan classifications by class of loan [Abstract]
Summary of loan quality by class of loan	325,277	271,721
Secured by 1-4 family residential [Member] | Special Mention [Member]
Summary of loan classifications by class of loan [Abstract]
Summary of loan quality by class of loan	931	896
Secured by 1-4 family residential [Member] | Substandard [Member]
Summary of loan classifications by class of loan [Abstract]
Summary of loan quality by class of loan	5,976	6,818
Secured by 1-4 family residential [Member] | Doubtful [Member]
Summary of loan classifications by class of loan [Abstract]
Summary of loan quality by class of loan	126	661
Secured by 1-4 family residential [Member] | Loss [Member]
Summary of loan classifications by class of loan [Abstract]
Summary of loan quality by class of loan	98	0
Other real estate loans [Member]
Summary of loan classifications by class of loan [Abstract]
Summary of loan quality by class of loan	250,778	258,035	258,012
Other real estate loans [Member] | Pass [Member]
Summary of loan classifications by class of loan [Abstract]
Summary of loan quality by class of loan	240,168	243,768
Other real estate loans [Member] | Special Mention [Member]
Summary of loan classifications by class of loan [Abstract]
Summary of loan quality by class of loan	3,805	7,254
Other real estate loans [Member] | Substandard [Member]
Summary of loan classifications by class of loan [Abstract]
Summary of loan quality by class of loan	5,716	5,827
Other real estate loans [Member] | Doubtful [Member]
Summary of loan classifications by class of loan [Abstract]
Summary of loan quality by class of loan	1,089	1,186
Other real estate loans [Member] | Loss [Member]
Summary of loan classifications by class of loan [Abstract]
Summary of loan quality by class of loan	0	0
Commercial [Member]
Summary of loan classifications by class of loan [Abstract]
Summary of loan quality by class of loan	193,826	190,482	179,907
Commercial [Member] | Pass [Member]
Summary of loan classifications by class of loan [Abstract]
Summary of loan quality by class of loan	187,157	183,532
Commercial [Member] | Special Mention [Member]
Summary of loan classifications by class of loan [Abstract]
Summary of loan quality by class of loan	1,559	3,638
Commercial [Member] | Substandard [Member]
Summary of loan classifications by class of loan [Abstract]
Summary of loan quality by class of loan	4,704	2,301
Commercial [Member] | Doubtful [Member]
Summary of loan classifications by class of loan [Abstract]
Summary of loan quality by class of loan	406	1,011
Commercial [Member] | Loss [Member]
Summary of loan classifications by class of loan [Abstract]
Summary of loan quality by class of loan	0	0
Consumer loans [Member]
Summary of loan classifications by class of loan [Abstract]
Summary of loan quality by class of loan	19,527	18,333	$ 17,000
Consumer loans [Member] | Pass [Member]
Summary of loan classifications by class of loan [Abstract]
Summary of loan quality by class of loan	17,588	16,347
Consumer loans [Member] | Special Mention [Member]
Summary of loan classifications by class of loan [Abstract]
Summary of loan quality by class of loan	27	42
Consumer loans [Member] | Substandard [Member]
Summary of loan classifications by class of loan [Abstract]
Summary of loan quality by class of loan	1,911	1,943
Consumer loans [Member] | Doubtful [Member]
Summary of loan classifications by class of loan [Abstract]
Summary of loan quality by class of loan	0	0
Consumer loans [Member] | Loss [Member]
Summary of loan classifications by class of loan [Abstract]
Summary of loan quality by class of loan	$ 1	$ 1