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Balance Sheet Offsetting (Details) - June 30, 2018 - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
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Offsetting Derivative Assets [Abstract] |  |
Gross amounts recognized | $ 68,065 | $ 29,503
Gross amounts offset in the balance sheet | 0 | 0
Net amounts presented in the balance sheet | 68,065 | 29,503
Financial instruments | (27,040) | (16,140)
Collateral | (38,601) | (13,234)
Net amount | 2,424 | 129
Offsetting Derivative Liabilities [Abstract] |  |
Gross amounts recognized | 63,363 | 37,164
Gross amounts offset in the balance sheet | 0 | 0
Net amounts presented in the balance sheet | 63,363 | 37,164
Financial instruments | (27,040) | (16,140)
Collateral | (35,513) | (20,662)
Net amount | $ 810 | $ 362

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