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

9 Months Ended

Sep. 30, 2015

Commitments and Contingencies Disclosure [Abstract]

Summary of lending-related and other commitments

	September 30, 2015		December 31, 2014
	($ in Thousands)
Commitments to extend credit, excluding commitments to originate residential mortgage loans held for sale(1)(2)	$	6,935,786	$	6,884,411
Commercial letters of credit (1)	11,484		9,179
Standby letters of credit (3)	317,079		353,292

⁽¹⁾  These off-balance sheet financial instruments are exercisable at the market rate prevailing at the date the underlying transaction will be completed and, thus, are deemed to have no current fair value, or the fair value is based on fees currently charged to enter into similar agreements and is not material at September 30, 2015 or December 31, 2014.

⁽²⁾  Interest rate lock commitments to originate residential mortgage loans held for sale are considered derivative instruments and are disclosed in Note 11.

⁽³⁾  The Corporation has established a liability of $3 million at September 30, 2015 compared to $4 million at December 31, 2014, as an estimate of the fair value of these financial instruments.

Summary of changes in the residential mortgage repurchase reserve

	For The Nine Months Ended September 30, 2015			For The Year Ended December 31, 2014
	($ in Thousands)
Balance at beginning of period	$	3,258		$	5,737
Repurchase provision expense	340			505
Adjustments to provision expense	(2,450		)	(2,250		)
Charge offs	(23		)	(734		)
Balance at end of period	$	1,125		$	3,258