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Share-Based Plans - Restricted Stock Activity (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Shares
Unvested, beginning of period (in shares)	142,020
Unvested, end of period (in shares)	155,945	142,020
Restricted Stock
Shares
Unvested, beginning of period (in shares)	142,020	139,455	137,880
Granted (in shares)	47,385	36,115	30,185
Vested (in shares)	(30,550)	(32,155)	(26,450)
Cancelled	(2,910)	(1,395)	(2,160)
Unvested, end of period (in shares)	155,945	142,020	139,455
Weighted-Average Grant Date Fair Value
Nonvested, beginning of period (in dollars per share)	$ 48.88	$ 45.75	$ 43.52
Granted (in dollars per share)	42.01	53.75	52.82
Vested (in dollars per share)	39.84	40.69	42.41
Cancelled (in dollars per share)	53.46	51.05	42.54
Nonvested, end of period (in dollars per share)	$ 48.52	$ 48.88	$ 45.75
Additional information
Fair value of shares vested	$ 1,370,000	$ 1,720,000	$ 1,440,000
Compensation expense	1,450,000	1,470,000	1,350,000
Compensation expense after tax	$ 981,000	$ 932,000	$ 872,000
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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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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