Classified by Maturity Date (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Debt Maturities, within One Year, Amortized Cost Basis, Percent of Total	6.60%
Available-for-sale Securities, Debt Maturities, within One Year, Fair Value, Percent of Total	6.50%
Available-for-sale Securities, Debt Maturities, after One Through Five Years, Amortized Cost Basis, Percent of Total	47.80%
Available-for-sale Securities, Debt Maturities, after One Through Five Years, Fair Value, Percent of Total	47.50%
Available-for-sale Securities, Debt Maturities, after Five Through Ten Years, Amortized Cost Basis, Percent of Total	32.70%
Available-for-sale Securities, Debt Maturities, after Five Through Ten Years, Fair Value, Percent of Total	32.90%
Available-for-sale Securities, Debt Maturities, after Ten Years, Amortized Cost Basis, Percent of Total	12.90%
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value, Percent of Total	13.10%
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis	$ 372,182	$ 350,063
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis, Percent of Total	100.00%
Available-for-sale Securities, Debt Securities	377,353	352,630
Available-for-sale Securities, Fair Value Disclosure, Percent of Total	100.00%
Fixed Maturities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Amortized Cost Basis	24,514
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value	24,519
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Amortized Cost Basis	177,870
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Fair Value	179,281
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Amortized Cost Basis	121,704
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Fair Value	124,061
Available-for-sale Securities, Debt Maturities, after Ten Years, Amortized Cost Basis	48,094
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value	49,492
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis	372,182
Available-for-sale Securities, Debt Securities	$ 377,353	$ 352,630

Available-for-sale Securities, Debt Maturities, after Five Through Ten Years, Amortized Cost Basis, Percent of Total

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Amount after adjustments of available-for-sale debt securities at cost, 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 cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Fair value of available-for-sale debt securities maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount after adjustments of available-for-sale debt securities at cost, maturing after 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 cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of debt securities categorized neither as held-to-maturity nor trading.

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