Fair Value Measurements (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Readily Available Market Prices(1)
Financial instrument assets:
Cash and cash equivalents	$ 146,605	$ 36,641
Investment securities	435,202	445,392
Loans held for sale	0	0
Loans, net of allowance for credit losses
Agricultural	0	0
Commercial and financial	0	0
Real estate:
Construction, 1 to 4 family residential	0	0
Construction, land development and commercial	0	0
Mortgage, farmland	0	0
Mortgage, 1 to 4 family first liens	0	0
Mortgage, 1 to 4 family junior liens	0	0
Mortgage, multi-family	0	0
Mortgage, commercial	0	0
Loans to individuals	0	0
Obligations of state and political subdivisions	0	0
Accrued interest receivable	0	0
Total financial instrument assets	581,807	482,033
Deposits
Noninterest-bearing deposits	0	0
Interest-bearing deposits	0	0
Other short-term borrowings, federal funds purchased		0
Federal Home Loan Bank borrowings	0	0
Accrued interest payable	0	0
Total financial instrument liabilities	0	0
Financial instrument with off-balance sheet risk:
Loan commitments	0	0
Letters of credit	0	0
Total financial instrument liabilities with off-balance-sheet risk	0	0
Observable Market Prices(2)
Financial instrument assets:
Cash and cash equivalents	0	0
Investment securities	342,824	337,173
Loans held for sale	2,991	1,663
Loans, net of allowance for credit losses
Agricultural	0	0
Commercial and financial	0	0
Real estate:
Construction, 1 to 4 family residential	0	0
Construction, land development and commercial	0	0
Mortgage, farmland	0	0
Mortgage, 1 to 4 family first liens	0	0
Mortgage, 1 to 4 family junior liens	0	0
Mortgage, multi-family	0	0
Mortgage, commercial	0	0
Loans to individuals	0	0
Obligations of state and political subdivisions	0	0
Accrued interest receivable	17,381	15,782
Total financial instrument assets	363,196	354,618
Deposits
Noninterest-bearing deposits	627,784	647,450
Interest-bearing deposits	2,817,233	2,711,088
Other short-term borrowings, federal funds purchased		82,061
Federal Home Loan Bank borrowings	220,000	40,000
Accrued interest payable	1,875	1,394
Total financial instrument liabilities	3,666,892	3,481,993
Financial instrument with off-balance sheet risk:
Loan commitments	0	0
Letters of credit	0	0
Total financial instrument liabilities with off-balance-sheet risk	0	0
Company Determined Market Prices(3)
Financial instrument assets:
Cash and cash equivalents	0	0
Investment securities	0	0
Loans held for sale	0	0
Loans, net of allowance for credit losses
Agricultural	102,314	108,992
Commercial and financial	261,697	259,500
Real estate:
Construction, 1 to 4 family residential	90,645	91,279
Construction, land development and commercial	226,217	188,726
Mortgage, farmland	249,347	237,849
Mortgage, 1 to 4 family first liens	1,083,680	1,055,091
Mortgage, 1 to 4 family junior liens	122,302	118,279
Mortgage, multi-family	414,245	411,092
Mortgage, commercial	380,359	377,753
Loans to individuals	35,562	36,934
Obligations of state and political subdivisions	45,983	45,653
Accrued interest receivable	0	0
Total financial instrument assets	3,012,351	2,931,148
Deposits
Noninterest-bearing deposits	0	0
Interest-bearing deposits	0	0
Other short-term borrowings, federal funds purchased		0
Federal Home Loan Bank borrowings	0	0
Accrued interest payable	0	0
Total financial instrument liabilities	0	0
Financial instrument with off-balance sheet risk:
Loan commitments	0	0
Letters of credit	0	0
Total financial instrument liabilities with off-balance-sheet risk	0	0
Carrying Amount
Financial instrument assets:
Cash and cash equivalents	146,605	36,641
Investment securities	778,026	782,565
Loans held for sale	2,991	1,663
Loans, net of allowance for credit losses
Agricultural	103,160	110,163
Commercial and financial	266,221	263,309
Real estate:
Construction, 1 to 4 family residential	90,412	91,297
Construction, land development and commercial	232,649	193,162
Mortgage, farmland	265,954	253,581
Mortgage, 1 to 4 family first liens	1,151,712	1,120,150
Mortgage, 1 to 4 family junior liens	127,044	121,890
Mortgage, multi-family	436,059	432,517
Mortgage, commercial	400,390	397,861
Loans to individuals	37,007	35,278
Obligations of state and political subdivisions	47,180	47,773
Accrued interest receivable	17,381	15,782
Total financial instrument assets	4,102,791	3,903,632
Deposits
Noninterest-bearing deposits	627,784	647,450
Interest-bearing deposits	2,816,297	2,709,917
Other short-term borrowings, federal funds purchased		82,061
Federal Home Loan Bank borrowings	220,000	40,000
Accrued interest payable	1,875	1,394
Total financial instrument liabilities	3,665,956	3,480,822
Financial instrument with off-balance sheet risk:
Loan commitments	732,930	701,729
Letters of credit	6,291	6,618
Total financial instrument liabilities with off-balance-sheet risk	739,221	708,347
Estimated Fair Value
Financial instrument assets:
Cash and cash equivalents	146,605	36,641
Investment securities	778,026	782,565
Loans held for sale	2,991	1,663
Loans, net of allowance for credit losses
Agricultural	102,314	108,992
Commercial and financial	261,697	259,500
Real estate:
Construction, 1 to 4 family residential	90,645	91,279
Construction, land development and commercial	226,217	188,726
Mortgage, farmland	249,347	237,849
Mortgage, 1 to 4 family first liens	1,083,680	1,055,091
Mortgage, 1 to 4 family junior liens	122,302	118,279
Mortgage, multi-family	414,245	411,092
Mortgage, commercial	380,359	377,753
Loans to individuals	35,562	36,934
Obligations of state and political subdivisions	45,983	45,653
Accrued interest receivable	17,381	15,782
Total financial instrument assets	3,957,354	3,767,799
Deposits
Noninterest-bearing deposits	627,784	647,450
Interest-bearing deposits	2,817,233	2,711,088
Other short-term borrowings, federal funds purchased		82,061
Federal Home Loan Bank borrowings	220,000	40,000
Accrued interest payable	1,875	1,394
Total financial instrument liabilities	3,666,892	3,481,993
Financial instrument with off-balance sheet risk:
Loan commitments	0	0
Letters of credit	0	0
Total financial instrument liabilities with off-balance-sheet risk	$ 0	$ 0