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Loans and Allowance for Loan Losses - Loans by Portfolio Segment (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022	Dec. 31, 2021
Loans and Leases Receivable Disclosure [Abstract]
Loans	$ 4,152,644	$ 4,147,691
Less: Allowance for loan losses	36,332	36,515	$ 35,524	$ 35,273
Total loans	4,116,312	4,111,176
Construction Real Estate Loans
Loans and Leases Receivable Disclosure [Abstract]
Loans	591,894	559,681
Less: Allowance for loan losses	3,152	3,164	3,604	3,787
1-4 Family Residential Real Estate Loans
Loans and Leases Receivable Disclosure [Abstract]
Loans	672,595	663,519
Less: Allowance for loan losses	2,314	2,173	1,982	1,866
Commercial Real Estate Loans
Loans and Leases Receivable Disclosure [Abstract]
Loans	1,990,861	1,987,707
Less: Allowance for loan losses	28,721	28,701	27,225	26,980
Commercial loans
Loans and Leases Receivable Disclosure [Abstract]
Loans	388,182	412,064
Less: Allowance for loan losses	1,901	2,235	2,454	2,397
Municipal loans
Loans and Leases Receivable Disclosure [Abstract]
Loans	438,566	450,067
Less: Allowance for loan losses	44	45	48	47
Loans to individuals
Loans and Leases Receivable Disclosure [Abstract]
Loans	70,546	74,653
Less: Allowance for loan losses	$ 200	$ 197	$ 211	$ 196

X

- Definition

Amount excluding accrued interest, of allowance for credit loss on financing receivable. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 45
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446

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- Definition

Amortized cost excluding accrued interest, after allowance for credit loss, of financing receivable. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 45
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446

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- Definition

Amortized cost excluding accrued interest, before allowance for credit loss, of financing receivable. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919230-210447

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 45
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 3B
-URI https://asc.fasb.org/extlink&oid=124255953&loc=SL120267963-210447

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