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

12 Months Ended

Dec. 31, 2018

Commitments and Contingencies Disclosure [Abstract]

Summary of lending-related and other commitments

The following is a summary of lending-related commitments:

	2018		2017
	($ in Thousands)
Commitments to extend credit, excluding commitments to originate residential mortgage loans held for sale (a) (b)	$	8,720,293	$	8,027,187
Commercial letters of credit (a)	7,599		11,886
Standby letters of credit (c)	255,904		235,361

(a) 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 December 31, 2018 and 2017.

(b) Interest rate lock commitments to originate residential mortgage loans held for sale are considered derivative instruments and are disclosed in Note 13.

(c)

The Corporation has established a liability of $2 million at both December 31, 2018 and December 31, 2017, respectively, as an estimate of the fair value of these financial instruments.

Summary of changes in the residential mortgage repurchase reserve

The following summarizes the changes in the mortgage repurchase reserve for the years ended as follows:

	2018			2017
	($ in Thousands)
Balance at beginning of year	$	987		$	900
Repurchase provision expense	345			246
Adjustments to provision expense	(450		)	—
Charge offs, net	(218		)	(159		)
Amount recorded at acquisition	88			—
Balance at end of year	$	752		$	987