Investments (Schedule of Amortized Cost and Estimated Fair Value of Debt Securities by Contractual Maturities) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Schedule of Investments [Line Items]
Due in one year or less, Amortized Cost	$ 64,432
Due after one year through five years, Amortized Cost	143,004
Due after five years through ten years, Amortized Cost	97,090
Due after ten years, Amortized Cost	46,361
Debt Maturities, Amortized Cost	382,840
Due in one year or less, Fair Value	65,029
Due after one year through five years, Fair Value	143,844
Due after five years through ten years, Fair Value	97,761
Due after ten years, Fair Value	45,598
Debt Securities, Fair Value	383,682	401,435
Mortgage Backed [Member]
Schedule of Investments [Line Items]
Debt Maturities, Amortized Cost	31,953
Debt Securities, Fair Value	$ 31,450	$ 9,724

Amount of available-for-sale debt securities at cost, net of adjustments, maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments.

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Amount of available-for-sale debt securities at cost, net of adjustments, maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments.

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