Securities Sold Under Agreements To Repurchase And Collateral Pledged By Company (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Securities Sold Under Agreements To Repurchase [Abstract]
Gross amounts of recognized liabilities	$ 406,354	$ 453,053
Gross amounts offset in the statement of Condition	0	0
Net amounts of liabilities presented in the Statement of Condition	406,354	453,053
Offsetting securities purchased under agreements to resell	(150)	(1,628)
Securities Collateral	(406,185)	(451,414)
Net amount	$ 19	$ 11