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Other Benefit Plans - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended		12 Months Ended	34 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Sep. 30, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of common stock under dividend reinvestment plan (in shares)	17,971	28,141	34,737
Issue of common stock under dividend reinvestment plan, price per share (USD per share)	$ 21.68	$ 14.38	$ 14.67
Salary continuation agreement, annual benefit	$ 25			$ 25
Salary continuation agreement, annual benefit, duration	20 years
Salary continuation agreement, liability	$ 295		$ 241	$ 295
Salary continuation agreement, period expense	$ 53	$ 45
Employer contribution over employees' gross pay (in percentage)	3.00%
Expense recognized in relation of plan, amount	$ 1,932	$ 1,412	1,978
Employee Stock Ownership Plan (ESOP), percent of eligible employee salary approved for contribution	2.00%	2.00%
Stock based compensation expense	$ 938	$ 275	395
ESOP contribution	366	260	$ 260
Issuance of common stock under employee stock ownership plan (in shares)				57,620
Employee Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expense recognized in relation to the Non-Qualified Stock Purchase Plan	$ 56	$ 30

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Number of shares issued during the period from a dividend reinvestment plan (DRIP). A dividend reinvestment plan allows the shareholders to reinvest dividends paid to them by the entity on new issues of stock by the entity.

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Liability for agreement to continue an employee's salary after termination of employment (but before retirement) including death, disability, or other event. For example, a company may agree to continue a disabled employee's salary for six months.

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