Commitments, Off-Balance Sheet Arrangements and Contingent Liabilities (Tables)

12 Months Ended

Dec. 31, 2013

Commitments, off-balance Sheet Arrangements, and Contingent Liabilities [Abstract]

Summary of lending-related and other commitments

		2013		2012
		($ in Thousands)
Commitments to extend credit, excluding commitments to originate residential mortgage loans held
	for sale(1)(2)	$	6,367,771	$	5,526,326
Commercial letters of credit(1)			132,777		85,689
Standby letters of credit(3)		$	250,030	$	303,705

Summary of changes in the residential mortgage repurchase reserve

		For the Year Ended		For the Year Ended
		December 31, 2013		December 31, 2012
		($ in Thousands)
Balance at beginning of year	$	3,300	$	0
Repurchase provision expense		5,909		7,109
Charge offs		(3,509)		(3,809)
Balance at end of year	$	5,700	$	3,300