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Derivatives (Derivative Assets And Collateral Received) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Derivative [Line Items] |  |
Gross amounts of recognized assets | $ 81,634 | $ 121,654
Derivative assets not subject to master netting agreements | 10,200 | 33,700
Derivatives, interest rate contracts | Subject to Master Netting Agreements |  |
Derivative [Line Items] |  |
Gross amounts of recognized assets | 71,458 | 87,962
Gross amounts offset in the Statements of Condition | 0 | 0
Net amounts of assets presented in the Statements of Condition | 71,458 | 87,962
Gross amounts not offset in the Statements of Condition, Derivative liabilities available for offset | (17,278) | (25,953)
Gross amounts not offset in the Statements of Condition, Collateral received | (33,370) | (52,888)
Net amount | $ 20,810 | $ 9,121

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