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Investments (Details Textual) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Dec. 31, 2012
Investments (Textual) [Abstract]
Fair value of issued securities	$ 5,930,614	$ 5,962,232
Investments (Additional Textual) [Abstract]
Impairment of securities	0
Cash received in an amount equal to fair value of securities transferred	95.00%
Fair value of securities transferred	129,767
Obligation for securities sold under agreement to repurchase, including accrued interest	134,000
Federal National Mortgage Association Certificates and Obligations (FNMA) [Member]
Investments (Textual) [Abstract]
Fair value of issued securities	383,040	375,111
Federal Home Loan Mortgage Corporation Certificates and Obligations (FHLMC) [Member]
Investments (Textual) [Abstract]
Fair value of issued securities	431,649	418,174
Government National Mortgage Association Certificates and Obligations (GNMA) [Member]
Investments (Textual) [Abstract]
Fair value of issued securities	$ 130,780	$ 136,998

Amount, after the effects of master netting arrangements, of funds outstanding borrowed in the form of a security resale agreement between the entity and another party for the purchase and resale of identical or substantially the same securities at a date certain for a specified price. Includes liabilities not subject to a master netting arrangement.

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