Securities Sold Under Agreements To Repurchase And Collateral Pledged By Company (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Securities Sold under Agreements to Repurchase [Abstract]
Gross amounts of recognized liabilities	$ 672,154	$ 656,602
Gross amounts offset in the Statements of Condition	0	0
Net amounts of liabilities presented in the Statements of Condition	672,154	656,602
Offsetting securities purchased under agreements to resell	(365)	(259)
Securities/ government guaranteed loans collateral	(671,789)	(656,216)
Net amount	$ 0	$ 127