Securities Sold Under Agreements To Repurchase And Collateral Pledged By Counterparties (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2013
Securities Sold Under Agreements To Repurchase [Abstract]
Gross amounts of recognized liabilities	$ 479,384		$ 427,232
Gross amounts offset in the Statement of Condition	0		0
Net amounts of liabilities presented in the Statement of Condition	479,384	442,789	427,232
Offsetting securities purchased under agreements to resell	(53,382)		(30,584)
Securities Collateral	(425,986)		(396,639)
Net amount	$ 16		$ 9