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Statements of Cash Flow (Tables)

12 Months Ended

Dec. 31, 2016

Supplemental Cash Flow Information [Abstract]

Schedule of Cash Flow, Supplemental Disclosures

($ in thousands)		2016				2015			2014
Cash paid during the period for:
Interest		$	22,098			21,892			22,221
Federal income tax		46,405				39,500			22,699
Non-cash items:
Exchange of fixed income securities, AFS		23,579				36,792			20,781
Exchange of fixed income securities, HTM		—				15,257			4,289
Corporate actions related to equity securities, AFS1		3,263				4,239			334
Assets acquired under capital lease arrangements		3,151				6,760			5,642
Non-cash purchase of property and equipment		78				—			338

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