Loans and Allowance for Loan Losses, Activity in Allowance for Loan Losses by Portfolio Segment (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2020	Dec. 31, 2019
Activity in allowance for loan losses [Roll Forward]
Balance, beginning of period				$ 7,846				$ 7,832	$ 7,846	$ 7,832	$ 7,654
Charge-offs									(3,590)	(18)	(98)
Recoveries									33	32	76
Net recoveries (charge-offs)									(3,557)	14	(22)
Provision (credit) for loan losses	$ 2,050	$ 1,250	$ 1,400	650	$ 0	$ 0	$ 0	0	5,350	0	200
Balance, end of period	9,639				7,846				9,639	7,846	7,832
Allowance Balance [Abstract]
Ending balance, individually evaluated for impairment												$ 177	$ 26
Ending balance, collectively evaluated for impairment												9,462	7,820
Total	9,639			7,846	7,846			7,832	7,846	7,832	7,832	9,639	7,846
Gross Loans [Abstract]
Ending balance, individually evaluated for impairment												23,123	11,118
Ending balance, collectively evaluated for impairment												815,965	697,550
Total												839,088	708,668
Construction & Development [Member]
Activity in allowance for loan losses [Roll Forward]
Balance, beginning of period				782				1,136	782	1,136	1,407
Charge-offs									0	0	0
Recoveries									0	0	0
Net recoveries (charge-offs)									0	0	0
Provision (credit) for loan losses									457	(354)	(271)
Balance, end of period	1,239				782				1,239	782	1,136
Allowance Balance [Abstract]
Ending balance, individually evaluated for impairment												0	0
Ending balance, collectively evaluated for impairment												1,239	782
Total	1,239			782	782			1,136	1,239	782	1,407	1,239	782
Gross Loans [Abstract]
Ending balance, individually evaluated for impairment												0	0
Ending balance, collectively evaluated for impairment												107,855	70,628
Total												107,855	70,628
1 - 4 Family Real Estate [Member]
Activity in allowance for loan losses [Roll Forward]
Balance, beginning of period				378				433	378	433	431
Charge-offs									0	(2)	(25)
Recoveries									2	5	3
Net recoveries (charge-offs)									2	3	(22)
Provision (credit) for loan losses									(46)	(58)	24
Balance, end of period	334				378				334	378	433
Allowance Balance [Abstract]
Ending balance, individually evaluated for impairment												0	0
Ending balance, collectively evaluated for impairment												334	378
Total	334			378	378			433	334	378	433	334	378
Gross Loans [Abstract]
Ending balance, individually evaluated for impairment												0	0
Ending balance, collectively evaluated for impairment												29,079	34,160
Total												29,079	34,160
Commercial Real Estate - Other [Member]
Activity in allowance for loan losses [Roll Forward]
Balance, beginning of period				3,025				2,035	3,025	2,035	1,865
Charge-offs									0	0	0
Recoveries									0	0	0
Net recoveries (charge-offs)									0	0	0
Provision (credit) for loan losses									312	990	170
Balance, end of period	3,337				3,025				3,337	3,025	2,035
Allowance Balance [Abstract]
Ending balance, individually evaluated for impairment												0	26
Ending balance, collectively evaluated for impairment												3,337	2,999
Total	3,337			3,025	3,025			2,035	3,337	3,025	1,865	3,337	3,025
Gross Loans [Abstract]
Ending balance, individually evaluated for impairment												8,054	5,841
Ending balance, collectively evaluated for impairment												282,435	267,437
Total												290,489	273,278
Commercial & Industrial [Member]
Activity in allowance for loan losses [Roll Forward]
Balance, beginning of period				2,887				3,231	2,887	3,231	2,779
Charge-offs									(3,289)	(4)	(73)
Recoveries									18	24	71
Net recoveries (charge-offs)									(3,271)	20	(2)
Provision (credit) for loan losses									4,419	(364)	454
Balance, end of period	4,035				2,887				4,035	2,887	3,231
Allowance Balance [Abstract]
Ending balance, individually evaluated for impairment												177	0
Ending balance, collectively evaluated for impairment												3,858	2,887
Total	4,035			2,887	2,887			3,231	4,035	2,887	2,779	4,035	2,887
Gross Loans [Abstract]
Ending balance, individually evaluated for impairment												14,601	2,750
Ending balance, collectively evaluated for impairment												336,647	258,012
Total												351,248	260,762
Agricultural [Member]
Activity in allowance for loan losses [Roll Forward]
Balance, beginning of period				642				818	642	818	1,015
Charge-offs									(300)	(11)	0
Recoveries									10	3	1
Net recoveries (charge-offs)									(290)	(8)	1
Provision (credit) for loan losses									228	(168)	(198)
Balance, end of period	580				642				580	642	818
Allowance Balance [Abstract]
Ending balance, individually evaluated for impairment												0	0
Ending balance, collectively evaluated for impairment												580	642
Total	580			642	642			818	580	642	818	580	642
Gross Loans [Abstract]
Ending balance, individually evaluated for impairment												468	2,527
Ending balance, collectively evaluated for impairment												50,051	55,418
Total												50,519	57,945
Consumer [Member]
Activity in allowance for loan losses [Roll Forward]
Balance, beginning of period				132				179	132	179	157
Charge-offs									(1)	(1)	0
Recoveries									3	0	1
Net recoveries (charge-offs)									2	(1)	1
Provision (credit) for loan losses									(20)	(46)	21
Balance, end of period	114				132				114	132	179
Allowance Balance [Abstract]
Ending balance, individually evaluated for impairment												0	0
Ending balance, collectively evaluated for impairment												114	132
Total	$ 114			$ 132	$ 132			$ 179	$ 114	$ 179	$ 157	114	132
Gross Loans [Abstract]
Ending balance, individually evaluated for impairment												0	0
Ending balance, collectively evaluated for impairment												9,898	11,895
Total												$ 9,898	$ 11,895