Share-Based Plans - Restricted Stock Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Shares
Nonvested, beginning of period (in shares)	145,677
Nonvested, end of period (in shares)	135,694	145,677
Restricted Stock
Shares
Nonvested, beginning of period (in shares)	145,677	140,577	155,945
Granted (in shares)	36,945	36,435	41,912
Vested (in shares)	(43,383)	(26,200)	(51,305)
Forfeited (in shares)	(3,545)	(5,135)	(5,975)
Nonvested, end of period (in shares)	135,694	145,677	140,577
Weighted-Average Grant Date Fair Value
Nonvested, beginning of period (in dollars per share)	$ 48.88	$ 48.57	$ 48.52
Granted (in dollars per share)	62.87	54.18	47.83
Vested (in dollars per share)	50.59	54.73	48.11
Forfeited (in dollars per share)	49.37	48.28	45.87
Nonvested, end of period (in dollars per share)	$ 52.13	$ 48.88	$ 48.57
Additional information
Fair value of shares vested	$ 2,520	$ 1,390	$ 2,420
Compensation expense	1,990	1,970	1,700
Compensation expense after tax	1,350	$ 1,420	$ 1,160
Unrecognized compensation expense	$ 3,670
Restricted Stock | Employees
Summary of restricted stock awards
Vesting period	5 years
Restricted Stock | Nonemployee Directors
Summary of restricted stock awards
Vesting period	3 years