Income Tax (Tables)

6 Months Ended

Jun. 30, 2017

Income Tax Disclosure [Abstract]

Schedule of Effective Income Tax Rate Reconciliation

The effective income tax rate varied from the combined federal and state statutory tax rates due to the following:

	Three Months Ended June 30,						Six Months Ended June 30,
Dollars in thousands	2017			2016			2017			2016
Income taxes at statutory rates (federal and state)	$	1,725		$	1,351		$	28,325		$	25,959
Increase (decrease):
Differences required to be flowed-through by regulatory commissions	66			65			1,584			1,583
Other, net	(122		)	(34		)	(1,317		)	(774		)
Total provision for income taxes	$	1,669		$	1,382		$	28,592		$	26,768
Effective tax rate	37.9		%	40.6		%	39.9		%	40.9		%