Loans - Evaluated for Impairment (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014
Allowance for loan losses:
Loans individually evaluated for impairment	$ 1,360		$ 1,594
Loans collectively evaluated for impairment	7,565		6,997
Total allowance balance:	8,925	$ 8,974	8,591	$ 8,645	$ 7,995	$ 7,981
Loan balances:
Loans individually evaluated for impairment	4,277		6,093
Loans collectively evaluated for impairment	653,477		627,454
Total loans balance:	657,754		633,547
Commercial
Allowance for loan losses:
Loans individually evaluated for impairment	564		80
Loans collectively evaluated for impairment	621		568
Total allowance balance:	1,185	752	648	1,036	1,139	1,117
Loan balances:
Loans individually evaluated for impairment	723		129
Loans collectively evaluated for impairment	70,976		67,231
Total loans balance:	71,699		67,360
Agriculture & AG RE
Allowance for loan losses:
Loans individually evaluated for impairment	0		0
Loans collectively evaluated for impairment	103		97
Total allowance balance:	103	119	97	65	50	69
Loan balances:
Loans individually evaluated for impairment	319		0
Loans collectively evaluated for impairment	43,752		50,121
Total loans balance:	44,071		50,121
Construction, Land & Development
Allowance for loan losses:
Loans individually evaluated for impairment	58		10
Loans collectively evaluated for impairment	394		513
Total allowance balance:	452	516	523	396	437	711
Loan balances:
Loans individually evaluated for impairment	142		127
Loans collectively evaluated for impairment	22,065		25,889
Total loans balance:	22,207		26,016
Commercial RE
Allowance for loan losses:
Loans individually evaluated for impairment	333		1,178
Loans collectively evaluated for impairment	4,910		4,503
Total allowance balance:	5,243	5,541	5,681	5,185	4,018	3,999
Loan balances:
Loans individually evaluated for impairment	1,063		4,488
Loans collectively evaluated for impairment	423,865		387,430
Total loans balance:	424,928		391,918
1-4 Family Residential
Allowance for loan losses:
Loans individually evaluated for impairment	402		325
Loans collectively evaluated for impairment	1,531		1,303
Total allowance balance:	1,933	2,042	1,628	1,951	2,342	2,075
Loan balances:
Loans individually evaluated for impairment	2,027		1,348
Loans collectively evaluated for impairment	89,602		93,879
Total loans balance:	91,629		95,227
Consumer
Allowance for loan losses:
Loans individually evaluated for impairment	3		1
Loans collectively evaluated for impairment	6		13
Total allowance balance:	9	$ 4	14	$ 12	$ 9	$ 10
Loan balances:
Loans individually evaluated for impairment	3		1
Loans collectively evaluated for impairment	3,217		2,904
Total loans balance:	$ 3,220		$ 2,905