Loans, Net - Summary of loan classifications by class of loan (Details) - USD ($) $ in Thousands	Dec. 31, 2016		Dec. 31, 2015		Dec. 31, 2014
Summary of loan classifications by class of loan [Abstract]
Summary of loan quality by class of loan	$ 860,097	[1]	$ 805,681	[1]	$ 754,846
Pass [Member]
Summary of loan classifications by class of loan [Abstract]
Summary of loan quality by class of loan	826,057		756,048
Special Mention [Member]
Summary of loan classifications by class of loan [Abstract]
Summary of loan quality by class of loan	10,168		20,854
Substandard [Member]
Summary of loan classifications by class of loan [Abstract]
Summary of loan quality by class of loan	19,431		25,920
Doubtful [Member]
Summary of loan classifications by class of loan [Abstract]
Summary of loan quality by class of loan	4,269		2,858
Loss [Member]
Summary of loan classifications by class of loan [Abstract]
Summary of loan quality by class of loan	172		1
Real Estate Loans Construction [Member]
Summary of loan classifications by class of loan [Abstract]
Summary of loan quality by class of loan	35,627		39,673		33,050
Real Estate Loans Construction [Member] | Pass [Member]
Summary of loan classifications by class of loan [Abstract]
Summary of loan quality by class of loan	30,065		30,114
Real Estate Loans Construction [Member] | Special Mention [Member]
Summary of loan classifications by class of loan [Abstract]
Summary of loan quality by class of loan	5,534		9,024
Real Estate Loans Construction [Member] | Substandard [Member]
Summary of loan classifications by class of loan [Abstract]
Summary of loan quality by class of loan	28		535
Real Estate Loans Construction [Member] | Doubtful [Member]
Summary of loan classifications by class of loan [Abstract]
Summary of loan quality by class of loan	0		0
Real Estate Loans Construction [Member] | Loss [Member]
Summary of loan classifications by class of loan [Abstract]
Summary of loan quality by class of loan	0		0
Real Estate Loans Secured by Farmland [Member]
Summary of loan classifications by class of loan [Abstract]
Summary of loan quality by class of loan	16,768		19,062
Real Estate Loans Secured by Farmland [Member] | Pass [Member]
Summary of loan classifications by class of loan [Abstract]
Summary of loan quality by class of loan	8,796		10,566
Real Estate Loans 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
Real Estate Loans Secured by Farmland [Member] | Substandard [Member]
Summary of loan classifications by class of loan [Abstract]
Summary of loan quality by class of loan	7,972		8,496
Real Estate Loans 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
Real Estate Loans 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
Real Estate Loans Secured by 1 - 4 Family Residential [Member]
Summary of loan classifications by class of loan [Abstract]
Summary of loan quality by class of loan	314,045		280,096		265,216
Real Estate Loans 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	310,233		271,721
Real Estate Loans 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	932		896
Real Estate Loans 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	2,584		6,818
Real Estate Loans 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	125		661
Real Estate Loans 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	171		0
Other Real Estate Loans [Member]
Summary of loan classifications by class of loan [Abstract]
Summary of loan quality by class of loan	283,613		258,035		255,236
Other Real Estate Loans [Member] | Pass [Member]
Summary of loan classifications by class of loan [Abstract]
Summary of loan quality by class of loan	274,591		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	2,287		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	4,759		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	1,976		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 Loans [Member]
Summary of loan classifications by class of loan [Abstract]
Summary of loan quality by class of loan	190,767		190,482		163,269
Commercial Loans [Member] | Pass [Member]
Summary of loan classifications by class of loan [Abstract]
Summary of loan quality by class of loan	185,030		183,532
Commercial Loans [Member] | Special Mention [Member]
Summary of loan classifications by class of loan [Abstract]
Summary of loan quality by class of loan	1,390		3,638
Commercial Loans [Member] | Substandard [Member]
Summary of loan classifications by class of loan [Abstract]
Summary of loan quality by class of loan	2,179		2,301
Commercial Loans [Member] | Doubtful [Member]
Summary of loan classifications by class of loan [Abstract]
Summary of loan quality by class of loan	2,168		1,011
Commercial Loans [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	19,277		18,333		$ 18,367
Consumer Loans [Member] | Pass [Member]
Summary of loan classifications by class of loan [Abstract]
Summary of loan quality by class of loan	17,342		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	25		42
Consumer Loans [Member] | Substandard [Member]
Summary of loan classifications by class of loan [Abstract]
Summary of loan quality by class of loan	1,909		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

[1] Includes net deferred loan costs and premiums of $3.3 million and $3.5 million, respectively.