Summary of Significant Accounting Policies - Calculation Of Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Accounting Standards Update and Change in Accounting Principle [Abstract]
Net income	$ 25,394	$ 30,741	$ 37,517
Basic weighted average common shares outstanding (in shares)	5,601,471	5,765,088	6,180,801
Dilutive effect of potential common shares from awards granted under equity incentive program (in shares)	60,000	64,000	68,000
Total (in shares)	5,661,460	5,829,412	6,249,313
Earnings per common share
Basic (in USD per share)	$ 4.53	$ 5.33	$ 6.07
Diluted (in USD per share)	$ 4.49	$ 5.27	$ 6.00