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Balance Sheet Offsetting (Tables)
 12 Months Ended
Dec. 31, 2018
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 of
recognized assets
 
 
 
Gross amounts not offset
in the balance sheet
 
 
 ($ in Thousands)
Gross amounts
offset in the
balance sheet
 
Net amounts
presented in
the balance sheet
 
Derivative liability available for offset
 
Collateral received
 
Net amount
Derivative assets: (a)
 
 
 
 
 
 
 
 
 
 
 
December 31, 2018
$
65,596

 
$
—

 
$
65,596

 
$
(22,873
)
 
$
(41,879
)
 
$
843

December 31, 2017
29,503

 
—

 
29,503

 
(16,140
)
 
(13,234
)
 
129

 
 
Gross
amounts of
recognized liabilities
 
 
 
Gross amounts not offset
in the balance sheet
 
 
 ($ in Thousands)
Gross amounts
offset in the
balance sheet
 
Net amounts
presented in
the balance sheet
 
Derivative asset available for offset
 
Collateral pledged
 
Net amount
Derivative liabilities (b)
 
 
 
 
 
 
 
 
 
 
 
December 31, 2018
$
22,951

 
$
—

 
$
22,951

 
$
(22,873
)
 
$
(63
)
 
$
16

December 31, 2017
37,164

 
—

 
37,164

 
(16,140
)
 
(20,662
)
 
362

(a) Includes interest and commodity instrument assets.
(b) Includes interest and commodity instrument liabilities.