Offsetting Assets and Liabilities (Details) (USD $)	Dec. 31, 2013		Dec. 31, 2012
Offsetting of Assets and Liabilities [Line Items]
Financial derivatives–assets, at fair value-	$ 59,664,000	[1]	$ 48,504,000	[1]
Fair value repurchase agreements	27,962,000	[1]	13,650,000	[1]
Financial derivatives–liabilities, at fair value-	(44,791,000)	[1]	(15,212,000)	[1]
Reverse Repurchase Agreements	(1,236,166,000)	[1]	(905,718,000)	[1]
Derivative Liability Instruments available for offset	(24,162,000)		(10,095,000)
Reverse Repurchase Agreements Available for Offset	(27,962,000)		(13,650,000)
Derivative Asset Instruments available for offset	24,162,000		10,095,000
Repurchase Agreements Available for Offset	27,962,000		13,650,000
Repurchase Agreements and Related Collateral Net	0		0
Reverse Repurchase Agreements and Related Collateral Net	0		0
Securities Collateral realting to Repurchase and Reverse Repurchase Agreements	1,480,000,000		1,060,000,000
Financial Derivatives - Assets [Member]
Offsetting of Assets and Liabilities [Line Items]
Financial derivatives–assets, at fair value-	59,664,000	[2]	48,504,000	[2]
Financial Instruments Pledged as Collateral	0	[3],[4]	0	[3],[4]
Cash Collateral (Received) Pledged	(17,273,000)	[3],[4]	(30,550,000)	[3],[4]
Derivatives and Related Collateral Net	18,229,000		7,859,000
Excess cash collateral	3,200,000		300,000
Securities Purchased under Agreements to Resell [Member]
Offsetting of Assets and Liabilities [Line Items]
Financial Instruments Pledged as Collateral	0	[3],[4]	0	[3],[4]
Cash Collateral (Received) Pledged	0	[3],[4]	0	[3],[4]
Securities Sold under Agreements to Repurchase [Member]
Offsetting of Assets and Liabilities [Line Items]
Financial Instruments Pledged as Collateral	1,205,278,000	[3],[4]	887,940,000	[3],[4]
Cash Collateral (Received) Pledged	2,926,000	[3],[4]	4,128,000	[3],[4]
Derivative Financial Instruments, Liabilities [Member]
Offsetting of Assets and Liabilities [Line Items]
Financial derivatives–liabilities, at fair value-	(44,791,000)	[2]	(15,212,000)	[2]
Financial Instruments Pledged as Collateral	0	[3],[4]	0	[3],[4]
Cash Collateral (Received) Pledged	20,629,000	[3],[4]	5,117,000	[3],[4]
Derivatives and Related Collateral Net	0		0
Excess cash collateral	$ 36,400,000		$ 11,900,000

[1] In the Company's Consolidated Statement of Assets, Liabilities, and Equity, all balances associated with repurchase agreements, reverse repurchase agreements, and financial derivatives are presented on a gross basis.

[2] See Note 2 and Note 3 in Notes to Consolidated Financial Statements.

[3] Total financial instruments pledged and cash collateral (received) or pledged can not exceed the gross amount of assets and (liabilities) as presented here. Therefore we have reduced the amount of financial instruments pledged as collateral related to our reverse repurchase agreements and cash collateral pledged on our financial derivative liabilities. Total financial instruments pledged as collateral on our reverse repurchase agreements as of December 31, 2013 and December 31, 2012 were $1.48 billion and $1.06 billion, respectively. As of December 31, 2013 and December 31, 2012, total cash collateral on financial derivative assets excludes excess net cash collateral pledged of $3.2 million and $0.3 million, respectively. As of December 31, 2013 and December 31, 2012, total cash collateral on financial derivative liabilities excludes excess cash collateral pledged of $36.4 million and $11.9 million, respectively.

[4] As collateral is called or posted per counterparty it is generally called or posted across all positions with each respective counterparty.