Loans, Impaired Financing Receivables Activity (Details) - USD ($)	3 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Recorded Investment
With no related allowance recorded		$ 17,906,000
With an allowance recorded		2,823,000
Total impaired loans		20,729,000
Unpaid Principal Balance
With no related allowance recorded		23,459,000
With an allowance recorded		2,954,000
Total		26,413,000
Related Allowance
With no related allowance recorded		0
With an allowance recorded		662,000
Total		$ 662,000
Decrease in impaired loans	$ 1,400,000
Percentages of impaired loans to loans held for investment (in hundredths)	0.72%	0.76%
Decrease in TDR loans	$ 40,000.00
Decrease in nonaccrual loans	0.12
Increase (Decrease) accruing loans past days or more financing receivable unpaid principal balance	$ 1,050,000.00
Prior period within which impairment is being measured	1 year
Number of period within which average appraisals obtained	1 month
Agricultural and Farmland Real Estate [Member]
Related Allowance
Decrease in impaired loans	$ 190,000
Agricultural [Member]
Recorded Investment
With no related allowance recorded		$ 1,337,000
With an allowance recorded		206,000
Total impaired loans		1,543,000
Unpaid Principal Balance
With no related allowance recorded		1,928,000
With an allowance recorded		206,000
Total		2,134,000
Related Allowance
With no related allowance recorded		0
With an allowance recorded		86,000
Total		86,000
Commercial and Financial [Member]
Recorded Investment
With no related allowance recorded		1,520,000
With an allowance recorded		671,000
Total impaired loans		2,191,000
Unpaid Principal Balance
With no related allowance recorded		2,907,000
With an allowance recorded		724,000
Total		3,631,000
Related Allowance
With no related allowance recorded		0
With an allowance recorded		411,000
Total		411,000
Real Estate Construction One to Four Family Residential [Member]
Recorded Investment
With no related allowance recorded		315,000
With an allowance recorded		536,000
Total impaired loans		851,000
Unpaid Principal Balance
With no related allowance recorded		337,000
With an allowance recorded		536,000
Total		873,000
Related Allowance
With no related allowance recorded		0
With an allowance recorded		7,000
Total		7,000
Real Estate: Construction, land development and commercial [Member]
Recorded Investment
With no related allowance recorded		415,000
With an allowance recorded		0
Total impaired loans		415,000
Unpaid Principal Balance
With no related allowance recorded		421,000
With an allowance recorded		0
Total		421,000
Related Allowance
With no related allowance recorded		0
With an allowance recorded		0
Total		0
Real Estate: Mortgage, farmland [Member]
Recorded Investment
With no related allowance recorded		2,061,000
With an allowance recorded		0
Total impaired loans		2,061,000
Unpaid Principal Balance
With no related allowance recorded		2,598,000
With an allowance recorded		0
Total		2,598,000
Related Allowance
With no related allowance recorded		0
With an allowance recorded		0
Total		0
Real Estate: Mortgage, 1 to 4 family first liens [Member]
Recorded Investment
With no related allowance recorded		6,253,000
With an allowance recorded		924,000
Total impaired loans		7,177,000
Unpaid Principal Balance
With no related allowance recorded		8,013,000
With an allowance recorded		975,000
Total		8,988,000
Related Allowance
With no related allowance recorded		0
With an allowance recorded		56,000
Total		56,000
Real Estate: Mortgage, 1 to 4 family junior liens [Member]
Recorded Investment
With no related allowance recorded		108,000
With an allowance recorded		132,000
Total impaired loans		240,000
Unpaid Principal Balance
With no related allowance recorded		350,000
With an allowance recorded		158,000
Total		508,000
Related Allowance
With no related allowance recorded		0
With an allowance recorded		37,000
Total		37,000
Real Estate: Mortgage, multi-family [Member]
Recorded Investment
With no related allowance recorded		1,773,000
With an allowance recorded		0
Total impaired loans		1,773,000
Unpaid Principal Balance
With no related allowance recorded		1,898,000
With an allowance recorded		0
Total		1,898,000
Related Allowance
With no related allowance recorded		0
With an allowance recorded		0
Total		0
Real Estate: Mortgage, commercial [Member]
Recorded Investment
With no related allowance recorded		4,124,000
With an allowance recorded		303,000
Total impaired loans		4,427,000
Unpaid Principal Balance
With no related allowance recorded		4,960,000
With an allowance recorded		304,000
Total		5,264,000
Related Allowance
With no related allowance recorded		0
With an allowance recorded		14,000
Total		14,000
Loans to individuals [Member]
Recorded Investment
With no related allowance recorded		0
With an allowance recorded		51,000
Total impaired loans		51,000
Unpaid Principal Balance
With no related allowance recorded		47,000
With an allowance recorded		51,000
Total		98,000
Related Allowance
With no related allowance recorded		0
With an allowance recorded		51,000
Total		$ 51,000