Loans - Narrative (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($) loan	Sep. 30, 2023 USD ($) modified_loan	Sep. 30, 2022 USD ($) loan	Dec. 31, 2022 USD ($)
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Loans	$ 1,864,971,000		$ 1,864,971,000		$ 1,737,106,000
Accrued interest receivable for loans	8,500,000		8,500,000		6,800,000
Interest income	55,000	$ 165,000	265,000	$ 380,000
Unfunded commitments to lend	0		0		0
Number of loans that subsequently defaulted | loan		0		0
Residential real estate
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Loans	339,501,000		$ 339,501,000		290,054,000
Residential real estate | Term Extension
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Number of modified loans | modified_loan			1
Term extension from modification			2 years
Commercial, financial & agricultural
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Loans	252,725,000		$ 252,725,000		223,923,000
Commercial, financial & agricultural | Term Extension and Payment Delay
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Number of modified loans | modified_loan			1
Term extension from modification			2 years
Loans Insured or Guaranteed by US Government Authorities
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Loans	82,383,000		$ 82,383,000		58,353,000
Loans Insured or Guaranteed by US Government Authorities | Residential real estate
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Loans	11,757,000		11,757,000		8,036,000
Loans Insured or Guaranteed by US Government Authorities | Commercial, financial & agricultural
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Loans	$ 27,645,000		$ 27,645,000		$ 11,787,000