Investments (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Available-for-sale securities
Amortized cost, fixed maturities	$ 596,255
Amortized cost	605,203	$ 594,837
Gross unrealized gains	13,895	11,137
Gross unrealized losses	3,885	6,033
Estimated fair value, fixed maturities	606,281
Estimated fair value	615,213	599,941
Fixed maturities
Available-for-sale securities
Amortized cost, fixed maturities	596,255	581,972
Gross unrealized gains, fixed maturities	13,895	11,137
Gross unrealized losses, fixed maturities	3,869	5,900
Estimated fair value, fixed maturities	606,281	587,209
States & political subdivisions
Available-for-sale securities
Amortized cost, fixed maturities	230,147	221,093
Gross unrealized gains, fixed maturities	12,384	10,761
Gross unrealized losses, fixed maturities	7	7
Estimated fair value, fixed maturities	242,524	231,847
Corporate debt securities
Available-for-sale securities
Amortized cost, fixed maturities	257,320	254,464
Gross unrealized gains, fixed maturities	1,302	281
Gross unrealized losses, fixed maturities	2,124	4,412
Estimated fair value, fixed maturities	256,498	250,333
Residential mortgage-backed securities
Available-for-sale securities
Amortized cost, fixed maturities	14,974	13,639
Gross unrealized gains, fixed maturities	27	4
Gross unrealized losses, fixed maturities	126	130
Estimated fair value, fixed maturities	14,875	13,513
Commercial mortgage-backed securities
Available-for-sale securities
Amortized cost, fixed maturities	36,623	38,630
Gross unrealized gains, fixed maturities	121	30
Gross unrealized losses, fixed maturities	1,148	1,089
Estimated fair value, fixed maturities	35,596	37,571
Collateralized debt obligations
Available-for-sale securities
Amortized cost, fixed maturities	55,123	51,905
Gross unrealized gains, fixed maturities	61	61
Gross unrealized losses, fixed maturities	414	221
Estimated fair value, fixed maturities	54,770	51,745
Other debt securities
Available-for-sale securities
Amortized cost, fixed maturities	2,068	2,241
Gross unrealized gains, fixed maturities	0	0
Gross unrealized losses, fixed maturities	50	41
Estimated fair value, fixed maturities	2,018	2,200
Common stock
Available-for-sale securities
Amortized cost, equity securities	8,948	12,865
Gross unrealized gains, equity securities	0	0
Gross unrealized losses, equity securities	16	133
Estimated fair value, equity securities	$ 8,932	$ 12,732

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