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Balance Sheet Offsetting (Tables)
 12 Months Ended
Dec. 31, 2017
Offsetting [Abstract]  
Balance Sheet Offsetting of Derivative Assets and Liabilities The following table presents the assets and liabilities subject to an enforceable master netting arrangement. The interest and commodity agreements we have with our commercial customers are not subject to an enforceable master netting arrangement, and therefore, are excluded from this table.
 
 
 
 
Gross amounts not offset
in the balance sheet
 
 ($ in Thousands)
Gross
amounts
recognized
Gross amounts
offset in the
balance sheet
Net amounts
presented in
the balance sheet
Financial
instruments
Collateral
Net amount
December 31, 2017
 
 
 
 
 
 
Derivative assets
 
 
 
 
 
 
Interest and commodity agreements
$
29,503

$
—

$
29,503

$
(29,503
)
$
—

$
—

Derivative liabilities
 
 
 
 
 
 
Interest and commodity agreements
$
37,164

$
—

$
37,164

$
(29,503
)
$
(7,661
)
$
—

December 31, 2016
 
 
 
 
 
 
Derivative assets
 
 
 
 
 
 
Interest and commodity agreements
$
18,031

$
—

$
18,031

$
(18,031
)
$
—

$
—

Derivative liabilities
 
 
 
 
 
 
Interest and commodity agreements
$
31,075

$
—

$
31,075

$
(18,031
)
$
(11,148
)
$
1,896