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Equity - Restricted Stock and performance-based stock units (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2015
Restricted stock
Restricted stock and performance based stock units activity
Outstanding at the beginning of the year (in shares)	163,569	156,297	140,899
Granted (in shares)	101,348	86,772	90,547
Vested (in shares)	(84,477)	(79,500)	(75,149)
Outstanding at the end of the year (in shares)	180,440	163,569	156,297
Restricted stock and performance-based stock units
Restricted stock and performance based stock units activity
Granted (in shares)	167,375	147,608	156,718
Outstanding at the end of the year (in shares)	373,474
Compensation expense
Remaining compensation expense	$ 8,297,000
Restricted stock and performance-based stock units | 2021
Restricted stock and performance based stock units activity
Outstanding at the end of the year (in shares)	159,537
Compensation expense
Remaining compensation expense	$ 5,201,000
Restricted stock and performance-based stock units | 2022
Restricted stock and performance based stock units activity
Outstanding at the end of the year (in shares)	117,417
Compensation expense
Remaining compensation expense	$ 2,729,000
Restricted stock and performance-based stock units | 2023
Restricted stock and performance based stock units activity
Outstanding at the end of the year (in shares)	96,520
Compensation expense
Remaining compensation expense	$ 367,000
Restricted stock and performance-based stock units | Grant Date Price $48.95 | Three year vesting
Restricted stock and performance based stock units activity
Granted (in shares)	76,464
Price per share	$ 48.95
Vesting period	3 years
Restricted stock and performance-based stock units | Grant Date Price $49.98 | TSR Targets
Restricted stock and performance based stock units activity
Granted (in shares)	66,027
Price per share	$ 49.98
Restricted stock and performance-based stock units | Grant Date Price $38.45 | Three year vesting
Restricted stock and performance based stock units activity
Granted (in shares)	15,000
Price per share	$ 38.45
Vesting period	3 years
Restricted stock and performance-based stock units | Grant Date Price $38.45 | Vesting Date, May 27, 2021
Restricted stock and performance based stock units activity
Granted (in shares)	9,884
Restricted stock and performance-based stock units | Grant Date Price $46.54 | Three year vesting
Restricted stock and performance based stock units activity
Granted (in shares)		78,276
Price per share		$ 46.54
Vesting period		3 years
Restricted stock and performance-based stock units | Grant Date Price $46.54 | TSR Targets
Restricted stock and performance based stock units activity
Granted (in shares)		60,836
Price per share		$ 46.54
Restricted stock and performance-based stock units | Grant Date Price $38.18 | Three year vesting
Restricted stock and performance based stock units activity
Granted (in shares)			81,819
Price per share			$ 38.18
Vesting period			3 years
Restricted stock and performance-based stock units | Grant Date Price $38.18 | TSR Targets
Restricted stock and performance based stock units activity
Granted (in shares)			66,171
Price per share			$ 38.18
Vesting period			4 years
Restricted stock and performance-based stock units | Grant Date Price $38.18 | Accelerated TSR Targets
Restricted stock and performance based stock units activity
Vesting period			3 years
Restricted stock and performance-based stock units | Grant Date Price $44.73 | Vesting Date, May 27, 2021
Restricted stock and performance based stock units activity
Price per share	$ 38.45
Restricted stock and performance-based stock units | Grant Date Price $44.73 | Vesting Date, May 29, 2020
Restricted stock and performance based stock units activity
Granted (in shares)		8,496
Price per share		$ 44.73
Restricted stock and performance-based stock units | Grant Date Price $41.25 | Vesting Date, May 30, 2019
Restricted stock and performance based stock units activity
Granted (in shares)			8,728
Price per share			$ 41.25
Performance-based stock units
Restricted stock and performance based stock units activity
Granted (in shares)	66,027	60,836	66,171
Vested (in shares)	(81,574)	(48,225)	0
Compensation expense
Compensation expense related to share-based award	$ 7,012,000	$ 6,566,000	$ 5,870,000
Performance-based stock units | 2021
Restricted stock and performance based stock units activity
Outstanding at the end of the year (in shares)	66,171
Performance-based stock units | 2022
Restricted stock and performance based stock units activity
Outstanding at the end of the year (in shares)	60,836
Performance-based stock units | 2023
Restricted stock and performance based stock units activity
Outstanding at the end of the year (in shares)	66,027
2015 Plan
Stock Based Compensation Plans
Total shares reserved for issuance	426,451			1,400,000

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