Loans and Allowance for Loan Losses, Information Regarding Nonperforming Assets (Details)		6 Months Ended
		Jun. 30, 2021 USD ($) Loan	Dec. 31, 2020 USD ($)
Nonperforming Assets [Abstract]
Nonaccrual loans		$ 13,620,000	$ 14,575,000
Troubled-debt restructurings	[1]	0	0
Accruing loans 90 or more days past due		106,000	1,960,000
Total nonperforming loans		13,726,000	16,535,000
TDR loans impaired		$ 12,160,000	12,980,000
COVID-19 [Member]
Nonperforming Assets [Abstract]
Number of loans modified that were not considered troubled debt restructurings | Loan		1
Amount of loans modified that were not considered troubled debt restructurings		$ 3,100,000
Construction & Development [Member]
Nonperforming Assets [Abstract]
Nonaccrual loans		0	0
Troubled-debt restructurings	[1]	0	0
Accruing loans 90 or more days past due		0	0
Total nonperforming loans		0	0
1 - 4 Family Real Estate [Member]
Nonperforming Assets [Abstract]
Nonaccrual loans		0	0
Troubled-debt restructurings	[1]	0	0
Accruing loans 90 or more days past due		0	0
Total nonperforming loans		0	0
Commercial Real Estate - Other [Member]
Nonperforming Assets [Abstract]
Nonaccrual loans		2,795,000	3,043,000
Troubled-debt restructurings	[1]	0	0
Accruing loans 90 or more days past due		0	1,960,000
Total nonperforming loans		2,795,000	5,003,000
Commercial & Industrial [Member]
Nonperforming Assets [Abstract]
Nonaccrual loans		10,825,000	11,063,000
Troubled-debt restructurings	[1]	0	0
Accruing loans 90 or more days past due		0	0
Total nonperforming loans		10,825,000	11,063,000
TDR loans impaired		10,700,000	10,900,000
Agricultural [Member]
Nonperforming Assets [Abstract]
Nonaccrual loans		0	469,000
Troubled-debt restructurings	[1]	0	0
Accruing loans 90 or more days past due		106,000	0
Total nonperforming loans		106,000	469,000
TDR loans impaired			469,000
Consumer [Member]
Nonperforming Assets [Abstract]
Nonaccrual loans		0	0
Troubled-debt restructurings	[1]	0	0
Accruing loans 90 or more days past due		0	0
Total nonperforming loans		$ 0	$ 0

[1] $12.16 million and $12.98 million of TDRs as of June 30, 2021 and December 31, 2020, respectively, are included in the nonaccrual loans balance in the line above.