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Commitments, Off-Balance Sheet Arrangements, and Contingent Liabilities (Tables)
 12 Months Ended
Dec. 31, 2016
Commitments and Contingencies Disclosure [Abstract]  
Summary of lending-related and other commitments
The following is a summary of lending-related commitments.
 
2016
 
2015
 
($ in Thousands)
Commitments to extend credit, excluding commitments to originate residential mortgage loans held for sale(1)(2)
$
8,131,131

 
$
7,402,518

Commercial letters of credit(1)
7,923

 
9,945

Standby letters of credit(3)
259,632

 
296,508



(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 December 31, 2016 and 2015.
(2)
Interest rate lock commitments to originate residential mortgage loans held for sale are considered derivative instruments and are disclosed in Note 14.
(3)
The Corporation has established a liability of $3 million at both December 31, 2016 and December 31, 2015, 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.
 
2016
 
2015
 
($ in Thousands)
Balance at beginning of year
$
1,197

 
$
3,258

Repurchase provision expense
456

 
428

Adjustments to provision expense
(750
)
 
(2,450
)
Charge offs, net
(3
)
 
(39
)
Balance at end of year
$
900

 
$
1,197