Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015
Allowance for loan losses [Roll Forward]
Beginning balance	$ 11,046	$ 11,786	$ 11,786
Charge-offs	(372)	(266)	(3,691)
Recoveries	356	54	658
Provision	300	450	2,293
Ending balance	11,330	12,024	11,046
Ending allowance balance attributable to loans:
Individually evaluated for impairment				$ 2,260	$ 2,664	$ 2,907
Collectively evaluated for impairment				9,070	8,382	9,117
Total ending allowance balance	11,046	11,786	11,786	11,330	11,046	12,024
Loans:
Individually evaluated for impairment				19,671	20,844	21,790
Collectively evaluated for impairment				804,880	784,837	740,125
Total Loans				824,551	805,681	761,915
Construction [Member]
Allowance for loan losses [Roll Forward]
Beginning balance	905	550	550
Charge-offs	(359)	0	0
Recoveries	15	9	246
Provision	450	8	109
Ending balance	1,011	567	905
Ending allowance balance attributable to loans:
Individually evaluated for impairment				0	53	63
Collectively evaluated for impairment				1,011	852	504
Total ending allowance balance	905	550	550	1,011	905	567
Loans:
Individually evaluated for impairment				79	203	235
Collectively evaluated for impairment				43,175	39,470	36,467
Total Loans				43,254	39,673	36,702
Real Estate Loans Secured by Farmland [Member]
Allowance for loan losses [Roll Forward]
Beginning balance	192	179	179
Charge-offs	0	0	0
Recoveries	0	0	0
Provision	(22)	6	13
Ending balance	170	185	192
Ending allowance balance attributable to loans:
Individually evaluated for impairment				0	0	0
Collectively evaluated for impairment				170	192	185
Total ending allowance balance	192	179	179	170	192	185
Loans:
Individually evaluated for impairment				7,903	7,903	7,903
Collectively evaluated for impairment				11,042	11,159	11,712
Total Loans				18,945	19,062	19,615
Secured by 1-4 family residential [Member]
Allowance for loan losses [Roll Forward]
Beginning balance	3,341	3,966	3,966
Charge-offs	(7)	0	(344)
Recoveries	278	19	359
Provision	(238)	188	(640)
Ending balance	3,374	4,173	3,341
Ending allowance balance attributable to loans:
Individually evaluated for impairment				1,086	1,120	1,339
Collectively evaluated for impairment				2,288	2,221	2,834
Total ending allowance balance	3,341	3,966	3,966	3,374	3,341	4,173
Loans:
Individually evaluated for impairment				4,102	5,127	5,352
Collectively evaluated for impairment				284,753	274,969	261,935
Total Loans				288,855	280,096	267,287
Other real estate loans [Member]
Allowance for loan losses [Roll Forward]
Beginning balance	3,761	3,916	3,916
Charge-offs	0	0	(9)
Recoveries	8	15	28
Provision	(68)	(122)	(174)
Ending balance	3,701	3,809	3,761
Ending allowance balance attributable to loans:
Individually evaluated for impairment				330	464	455
Collectively evaluated for impairment				3,371	3,297	3,354
Total ending allowance balance	3,761	3,916	3,916	3,701	3,761	3,809
Loans:
Individually evaluated for impairment				4,179	4,196	4,510
Collectively evaluated for impairment				260,277	253,839	248,736
Total Loans				264,456	258,035	253,246
Commercial [Member]
Allowance for loan losses [Roll Forward]
Beginning balance	1,706	2,354	2,354
Charge-offs	0	(246)	(3,281)
Recoveries	5	5	14
Provision	403	(4)	2,619
Ending balance	2,114	2,109	1,706
Ending allowance balance attributable to loans:
Individually evaluated for impairment				57	27	50
Collectively evaluated for impairment				2,057	1,679	2,059
Total ending allowance balance	1,706	2,354	2,354	2,114	1,706	2,109
Loans:
Individually evaluated for impairment				1,525	1,517	790
Collectively evaluated for impairment				188,420	188,965	164,967
Total Loans				189,945	190,482	165,757
Consumer [Member]
Allowance for loan losses [Roll Forward]
Beginning balance	1,141	821	821
Charge-offs	(6)	(20)	(57)
Recoveries	50	6	11
Provision	(225)	374	366
Ending balance	960	1,181	1,141
Ending allowance balance attributable to loans:
Individually evaluated for impairment				787	1,000	1,000
Collectively evaluated for impairment				173	141	181
Total ending allowance balance	$ 1,141	$ 821	$ 821	960	1,141	1,181
Loans:
Individually evaluated for impairment				1,883	1,898	3,000
Collectively evaluated for impairment				17,213	16,435	16,308
Total Loans				$ 19,096	$ 18,333	$ 19,308