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Share-Based Plans - Restricted Stock Activity (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Shares
Unvested, beginning of period (in shares)	155,945
Unvested, end of period (in shares)	140,577	155,945
Restricted Stock
Shares
Unvested, beginning of period (in shares)	155,945	142,020	139,455
Granted (in shares)	41,912	47,385	36,115
Vested (in shares)	(51,305)	(30,550)	(32,155)
Forfeited (in shares)	(5,975)	(2,910)	(1,395)
Unvested, end of period (in shares)	140,577	155,945	142,020
Weighted-Average Grant Date Fair Value
Nonvested, beginning of period (in dollars per share)	$ 48.52	$ 48.88	$ 45.75
Granted (in dollars per share)	47.83	42.01	53.75
Vested (in dollars per share)	48.11	39.84	40.69
Forfeited (in dollars per share)	45.87	53.46	51.05
Nonvested, end of period (in dollars per share)	$ 48.57	$ 48.52	$ 48.88
Additional information
Fair value of shares vested	$ 2,420,000	$ 1,370,000	$ 1,720,000
Compensation expense	1,700,000	1,450,000	1,470,000
Compensation expense after tax	$ 1,160,000	$ 981,000	$ 932,000
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
2013 Plan and Amended 2004 Plan | Restricted Stock
Additional information
Unrecognized compensation expense	$ 3,760,000

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