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

3 Months Ended

Mar. 31, 2013

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

Summary of lending-related and other commitments

			March 31, 2013			December 31, 2012
			($ in Thousands)
Commitments to extend credit, excluding commitments to originate residential
	mortgage loans held for sale⁽¹⁾⁽²⁾	$	5,504,835		$	5,526,326
Commercial letters of credit ⁽¹⁾			131,905			85,689
Standby letters of credit ⁽³⁾			276,978			303,705

Summary of changes in the residential mortgage repurchase reserve

			For the Three
			Months Ended			For the Year Ended
			March 31, 2013			December 31, 2012
			($ in Thousands)

Balance at beginning of period		$	3,300		$	0
Repurchase provision expense			2,985			7,109
Charge offs			(1,885)			(3,809)
Balance at end of period		$	4,400		$	3,300