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Securities Sold Under Agreements To Repurchase And Collateral Pledged By Company (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Securities Sold under Agreements to Repurchase [Abstract]    
Gross amounts of recognized liabilities $ 656,602 $ 453,053
Gross amounts offset in the Statements of Condition 0 0
Net amounts of liabilities presented in the Statements of Condition 656,602 453,053
Offsetting securities purchased under agreements to resell (259) (1,628)
Securities/ government guaranteed loans collateral (656,216) (451,414)
Net amount $ 127 $ 11