Loans and Allowance for Loan Losses, Activity in Allowance for Loan Losses by Portfolio Segment (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Dec. 31, 2019
Activity in allowance for loan losses [Roll Forward]
Balance, beginning of period	$ 8,513	$ 7,835	$ 7,846	$ 7,832
Charge-offs	(39)	(10)	(39)	(14)
Recoveries	4	11	21	18
Net recoveries (charge-offs)	(35)	1	(18)	4
Provision (credit) for loan losses	1,400	0	2,050	0
Balance, end of period	9,878	7,836	9,878	7,836
Allowance Balance [Abstract]
Ending balance, individually evaluated for impairment					$ 325	$ 26
Ending balance, collectively evaluated for impairment					9,553	7,820
Total	8,513	7,836	9,878	7,836	9,878	7,846
Gross Loans [Abstract]
Ending balance, individually evaluated for impairment					16,276	11,118
Ending balance, collectively evaluated for impairment					823,929	697,550
Total					840,205	708,668
Construction & Development [Member]
Activity in allowance for loan losses [Roll Forward]
Balance, beginning of period	944	1,290	782	1,136
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Net recoveries (charge-offs)	0	0	0	0
Provision (credit) for loan losses	142	(259)	304	(105)
Balance, end of period	1,086	1,031	1,086	1,031
Allowance Balance [Abstract]
Ending balance, individually evaluated for impairment					0	0
Ending balance, collectively evaluated for impairment					1,086	782
Total	1,086	1,031	1,086	1,031	1,086	782
Gross Loans [Abstract]
Ending balance, individually evaluated for impairment					0	0
Ending balance, collectively evaluated for impairment					92,380	70,628
Total					92,380	70,628
1 - 4 Family Real Estate [Member]
Activity in allowance for loan losses [Roll Forward]
Balance, beginning of period	376	452	378	433
Charge-offs	0	0	0	0
Recoveries	0	1	2	2
Net recoveries (charge-offs)	0	1	2	2
Provision (credit) for loan losses	(27)	(5)	(31)	13
Balance, end of period	349	448	349	448
Allowance Balance [Abstract]
Ending balance, individually evaluated for impairment					130	0
Ending balance, collectively evaluated for impairment					219	378
Total	349	448	349	448	349	378
Gross Loans [Abstract]
Ending balance, individually evaluated for impairment					1,143	0
Ending balance, collectively evaluated for impairment					28,532	34,160
Total					29,675	34,160
Commercial Real Estate - Other [Member]
Activity in allowance for loan losses [Roll Forward]
Balance, beginning of period	3,032	2,087	3,025	2,035
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Net recoveries (charge-offs)	0	0	0	0
Provision (credit) for loan losses	326	242	333	294
Balance, end of period	3,358	2,329	3,358	2,329
Allowance Balance [Abstract]
Ending balance, individually evaluated for impairment					26	26
Ending balance, collectively evaluated for impairment					3,332	2,999
Total	3,358	2,329	3,358	2,329	3,358	3,025
Gross Loans [Abstract]
Ending balance, individually evaluated for impairment					3,609	5,841
Ending balance, collectively evaluated for impairment					282,000	267,437
Total					285,609	273,278
Commercial & Industrial [Member]
Activity in allowance for loan losses [Roll Forward]
Balance, beginning of period	3,495	3,068	2,887	3,231
Charge-offs	(39)	0	(39)	(4)
Recoveries	4	7	9	13
Net recoveries (charge-offs)	(35)	7	(30)	9
Provision (credit) for loan losses	920	96	1,523	(69)
Balance, end of period	4,380	3,171	4,380	3,171
Allowance Balance [Abstract]
Ending balance, individually evaluated for impairment					0	0
Ending balance, collectively evaluated for impairment					4,380	2,887
Total	4,380	3,171	4,380	3,171	4,380	2,887
Gross Loans [Abstract]
Ending balance, individually evaluated for impairment					7,739	2,750
Ending balance, collectively evaluated for impairment					364,815	258,012
Total					372,554	260,762
Agricultural [Member]
Activity in allowance for loan losses [Roll Forward]
Balance, beginning of period	551	760	642	818
Charge-offs	0	(10)	0	(10)
Recoveries	0	3	10	3
Net recoveries (charge-offs)	0	(7)	10	(7)
Provision (credit) for loan losses	28	(58)	(73)	(116)
Balance, end of period	579	695	579	695
Allowance Balance [Abstract]
Ending balance, individually evaluated for impairment					169	0
Ending balance, collectively evaluated for impairment					410	642
Total	579	695	579	695	579	642
Gross Loans [Abstract]
Ending balance, individually evaluated for impairment					3,785	2,527
Ending balance, collectively evaluated for impairment					45,489	55,418
Total					49,274	57,945
Consumer [Member]
Activity in allowance for loan losses [Roll Forward]
Balance, beginning of period	115	178	132	179
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Net recoveries (charge-offs)	0	0	0	0
Provision (credit) for loan losses	11	(16)	(6)	(17)
Balance, end of period	126	162	126	162
Allowance Balance [Abstract]
Ending balance, individually evaluated for impairment					0	0
Ending balance, collectively evaluated for impairment					126	132
Total	$ 126	$ 162	$ 126	$ 162	126	132
Gross Loans [Abstract]
Ending balance, individually evaluated for impairment					0	0
Ending balance, collectively evaluated for impairment					10,713	11,895
Total					$ 10,713	$ 11,895