Retirement Plans (Table)

9 Months Ended

Sep. 30, 2015

Compensation and Retirement Disclosure [Abstract]

Schedule of Components of Net Periodic Benefit Cost

	Retirement Income Plan Quarter ended September 30,					Retirement Life Plan Quarter ended September 30,
($ in thousands)	2015			2014		2015		2014
Components of Net Periodic Benefit Cost:
Net Periodic Benefit Cost:
Service cost	$	1,964		1,627		$	—	—
Interest cost	3,501			3,253		64		73
Expected return on plan assets	(3,991		)	(3,919	)	—		—
Amortization of unrecognized net actuarial loss	1,696			367		13		14
Total net periodic cost	$	3,170		1,328		$	77	87

	Retirement Income Plan Nine Months ended September 30,					Retirement Life Plan Nine Months ended September 30,
($ in thousands)	2015			2014		2015		2014
Components of Net Periodic Benefit Cost:
Net Periodic Benefit Cost:
Service cost	$	5,891		4,880		$	—	—
Interest cost	10,504			9,760		190		219
Expected return on plan assets	(11,972		)	(11,756	)	—		—
Amortization of unrecognized net actuarial loss	5,086			1,102		41		40
Total net periodic cost	$	9,509		3,986		$	231	259

Schedule of Weighted-Average Expense Assumptions

	Retirement Income Plan Nine Months ended September 30,			Retirement Life Plan Nine Months ended September 30,
	2015		2014	2015		2014
Weighted-Average Expense Assumptions:
Discount rate	4.29	%	5.16	4.08	%	4.85
Expected return on plan assets	6.27		6.92	—		—
Rate of compensation increase	4.00		4.00	—		—