Securities Sold Under Agreements To Repurchase And Collateral Pledged By Counterparties (Details) - USD ($)	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015
Securities Sold Under Agreements To Repurchase [Abstract]
Gross amounts of recognized liabilities	$ 425,217,000		$ 309,297,000
Gross amounts offset in the statement of Condition	0		0
Net amounts of liabilities presented in the Statement of Condition	425,217,000	$ 338,133,000	309,297,000
Offsetting securities purchased under agreements to resell	(37,261,000)		(1,581,000)
Securities Collateral	(387,897,000)		(307,637,000)
Net amount	$ 59,000		$ 79,000