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Borrowings (Repurchase Agreements) (Details) (Securities Sold under Agreements to Repurchase [Member], USD $) In Thousands, unless otherwise specified			3 Months Ended
	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2014 Due date: 12 3 2014 [Member]	Sep. 30, 2014 Due date: 6 13 2015 [Member]	Sep. 30, 2014 Due date: 12 8 2016 [Member]	Sep. 30, 2014 Due date: 3 2 2017 [Member]
Debt Instrument [Line Items]
Borrowing Balance	$ 1,010,000	$ 1,265,000	$ 85,000	$ 255,000	$ 170,000	$ 500,000
Weighted Average Coupon	2.831%		0.675%	0.84%	1.50%	4.78%
Settlement Date			Dec. 03, 2012	Dec. 10, 2012	Dec. 06, 2012	Mar. 02, 2007
Investment Repurchase Agreement, Repurchase Date			Dec. 03, 2014	Jun. 13, 2015	Dec. 08, 2016	Mar. 02, 2017