Investments (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Available-for-sale securities
Amortized cost, fixed maturities	$ 681,123
Amortized cost	690,072	$ 594,837
Gross unrealized gains	16,213	11,137
Gross unrealized losses	1,910	6,033
Estimated fair value, fixed maturities	695,355
Estimated fair value	704,375	599,941
Fixed maturities
Available-for-sale securities
Amortized cost, fixed maturities	681,123	581,972
Gross unrealized gains, fixed maturities	16,142	11,137
Gross unrealized losses, fixed maturities	1,910	5,900
Estimated fair value, fixed maturities	695,355	587,209
U.S. government & agencies
Available-for-sale securities
Amortized cost, fixed maturities	2,008
Gross unrealized gains, fixed maturities	40
Gross unrealized losses, fixed maturities	0
Estimated fair value, fixed maturities	2,048
States & political subdivisions
Available-for-sale securities
Amortized cost, fixed maturities	234,111	221,093
Gross unrealized gains, fixed maturities	12,207	10,761
Gross unrealized losses, fixed maturities	59	7
Estimated fair value, fixed maturities	246,259	231,847
Corporate debt securities
Available-for-sale securities
Amortized cost, fixed maturities	317,745	254,464
Gross unrealized gains, fixed maturities	3,351	281
Gross unrealized losses, fixed maturities	828	4,412
Estimated fair value, fixed maturities	320,268	250,333
Residential mortgage-backed securities
Available-for-sale securities
Amortized cost, fixed maturities	17,246	13,639
Gross unrealized gains, fixed maturities	65	4
Gross unrealized losses, fixed maturities	166	130
Estimated fair value, fixed maturities	17,145	13,513
Commercial mortgage-backed securities
Available-for-sale securities
Amortized cost, fixed maturities	41,565	38,630
Gross unrealized gains, fixed maturities	213	30
Gross unrealized losses, fixed maturities	793	1,089
Estimated fair value, fixed maturities	40,985	37,571
Collateralized debt obligations
Available-for-sale securities
Amortized cost, fixed maturities	66,448	51,905
Gross unrealized gains, fixed maturities	263	61
Gross unrealized losses, fixed maturities	64	221
Estimated fair value, fixed maturities	66,647	51,745
Other debt securities
Available-for-sale securities
Amortized cost, fixed maturities	2,000	2,241
Gross unrealized gains, fixed maturities	3	0
Gross unrealized losses, fixed maturities	0	41
Estimated fair value, fixed maturities	2,003	2,200
Common stock
Available-for-sale securities
Amortized cost, equity securities	8,949	12,865
Gross unrealized gains, equity securities	71	0
Gross unrealized losses, equity securities	0	133
Estimated fair value, equity securities	$ 9,020	$ 12,732

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