Securities Sold Under Agreements To Repurchase And Collateral Pledged By Counterparties (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013
Securities Sold Under Agreements To Repurchase [Abstract]
Gross amounts of recognized liabilities	$ 411,795		$ 488,010
Gross amounts offset in the statement of Condition	0		0
Net amounts of liabilities presented in the Statement of Condition	411,795	442,789	488,010
Offsetting securities purchased under agreements to resell	(5,827)		(2,196)
Securities Collateral	(405,908)		(485,766)
Net amount	$ 60		$ 48