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Share-Based Plans - Restricted Stock Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Shares
Unvested, beginning of period (in shares)	139,455
Unvested, end of period (in shares)	142,020	139,455
Restricted Stock
Shares
Unvested, beginning of period (in shares)	139,455	137,880	141,755
Granted (in shares)	36,115	30,185	29,625
Vested (in shares)	(32,155)	(26,450)	(31,810)
Forfeited	(1,395)	(2,160)	(1,690)
Unvested, end of period (in shares)	142,020	139,455	137,880
Weighted-Average Grant Date Fair Value
Nonvested, beginning of period (in dollars per share)	$ 45.75	$ 43.52	$ 39.77
Granted (in dollars per share)	53.75	52.82	52.73
Vested (in dollars per share)	40.69	42.41	35.42
Forfeited (in dollars per share)	51.05	42.54	43.16
Nonvested, end of period (in dollars per share)	$ 48.88	$ 45.75	$ 43.52
Additional information
Compensation expense	$ 1,470	$ 1,350	$ 1,450
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	$ 3,330

X

- Definition

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

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