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Stock Based Compensation (Details) - USD ($)	3 Months Ended			9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2019	Sep. 30, 2018
Total charge to operations:
Share based compensation charged to operations	$ 942,000	$ 971,000		$ 2,834,000	$ 2,653,000
Restricted stock and RSU grants
Restricted stock and RSU grants:
Weighted average per share value of non-vested shares (based on grant price) (in dollars per share)	$ 24.98	$ 23.83		$ 24.98	$ 23.83
Value of stock vested during the year (based on grant price)	$ 61,500			$ 2,365,000	$ 2,289,000
Weighted average per share value of shares forfeited during the year (based on grant price) (in dollars per share)	$ 24.41	$ 23.39		$ 24.41	$ 23.59
Restricted stock
Stock Based Compensation
Vesting period				5 years
Summary of the activity of the incentive plans
Average per share grant price (in dollars per share)				$ 25.70	$ 25.31
Deferred compensation to be recognized over vesting period	$ 3,856,000	$ 3,664,000		$ 3,856,000	$ 3,664,000
Number of non-vested shares:
Non-vested beginning of period (in shares)	689,150	651,500		651,250	612,900
Number of shares awarded				150,050	144,750
Vested during year (in shares)	(2,500)			(114,650)	(106,000)
Forfeitures (in shares)	(12,400)	(250)		(12,400)	(400)
Non-vested end of period (in shares)	674,250	651,250		674,250	651,250
Total charge to operations:
Share based compensation charged to operations	$ 717,000	$ 763,000		$ 2,403,000	$ 2,263,000
Total compensation costs related to non-vested awards that have not yet been recognized	$ 7,965,000			$ 7,965,000
Approximate weighted average remaining vesting period				2 years 4 months 24 days
RSUs
Summary of the activity of the incentive plans
Average per share grant price (in dollars per share)	$ 28.96	$ 26.41		$ 28.96	$ 26.41
Deferred compensation to be recognized over vesting period	$ 923,000	$ 1,136,000		$ 923,000	$ 1,136,000
Number of non-vested shares:
Non-vested beginning of period (in shares)	152,500	76,250		152,500	76,250
Number of shares awarded	77,776	76,250	76,250	77,776	76,250
Vested during year (in shares)				0
Forfeitures (in shares)				0
Non-vested end of period (in shares)	230,276	152,500		230,276	152,500
Total charge to operations:
Share based compensation charged to operations	$ 225,000	$ 208,000		$ 431,000	$ 390,000
Total compensation costs related to non-vested awards that have not yet been recognized	$ 1,559,000			$ 1,559,000
Approximate weighted average remaining vesting period				1 year 9 months 18 days
TSR Awards
Stock Based Compensation
Percentage of RSUs to vest upon achievement of specified criteria				50.00%
TSR Awards | Awards granted in 2019
Valuation assumptions
Expected life				3 years
Dividend rate				6.22%
Risk-free interest rate minimum				1.79%
Risk-free interest rate maximum				2.07%
Expected price volatility minimum				21.37%
Expected price volatility maximum				23.04%
ROC Awards
Stock Based Compensation
Percentage of RSUs to vest upon achievement of specified criteria				50.00%
2019 Incentive Plan
Stock Based Compensation
Maximum number of shares authorized for issuance	750,000			750,000
2019 Incentive Plan | RSUs
Number of non-vested shares:
Number of shares awarded				77,776
2016 and 2012 Incentive Plans | Restricted stock and RSU grants
Number of non-vested shares:
Non-vested end of period (in shares)	826,750			826,750
Pay-for-performance program | RSUs | Awards granted in 2017
Summary of the activity of the incentive plans
Aggregate fair value of the shares granted	$ 787,000			$ 787,000
Pay-for-performance program | RSUs | Awards granted in 2018
Summary of the activity of the incentive plans
Aggregate fair value of the shares granted	856,000			856,000
Pay-for-performance program | RSUs | Awards granted in 2019
Summary of the activity of the incentive plans
Aggregate fair value of the shares granted	$ 923,000			$ 923,000

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