Investments (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Available-for-sale securities
Amortized cost, fixed maturities	$ 581,972
Amortized cost	594,837	$ 579,225
Gross unrealized gains	11,137	14,384
Gross unrealized losses	6,033	3,839
Estimated fair value, fixed maturities	587,209
Estimated fair value	599,941	589,770
Fixed maturities
Available-for-sale securities
Amortized cost, fixed maturities	581,972	554,985
Gross unrealized gains, fixed maturities	11,137	13,218
Gross unrealized losses, fixed maturities	5,900	3,663
Estimated fair value, fixed maturities	587,209	564,540
States & political subdivisions
Available-for-sale securities
Amortized cost, fixed maturities	221,093	219,550
Gross unrealized gains, fixed maturities	10,761	11,609
Gross unrealized losses, fixed maturities	7	25
Estimated fair value, fixed maturities	231,847	231,134
Corporate debt securities
Available-for-sale securities
Amortized cost, fixed maturities	254,464	235,613
Gross unrealized gains, fixed maturities	281	1,491
Gross unrealized losses, fixed maturities	4,412	3,064
Estimated fair value, fixed maturities	250,333	234,040
Residential mortgage-backed securities
Available-for-sale securities
Amortized cost, fixed maturities	13,639	8,379
Gross unrealized gains, fixed maturities	4	15
Gross unrealized losses, fixed maturities	130	19
Estimated fair value, fixed maturities	13,513	8,375
Commercial mortgage-backed securities
Available-for-sale securities
Amortized cost, fixed maturities	38,630	51,647
Gross unrealized gains, fixed maturities	30	63
Gross unrealized losses, fixed maturities	1,089	455
Estimated fair value, fixed maturities	37,571	51,255
Collateralized debt obligations
Available-for-sale securities
Amortized cost, fixed maturities	51,905	32,964
Gross unrealized gains, fixed maturities	61	40
Gross unrealized losses, fixed maturities	221	72
Estimated fair value, fixed maturities	51,745	32,932
Other debt securities
Available-for-sale securities
Amortized cost, fixed maturities	2,241	6,832
Gross unrealized gains, fixed maturities	0	0
Gross unrealized losses, fixed maturities	41	28
Estimated fair value, fixed maturities	2,200	6,804
Nonredeemable preferred stock
Available-for-sale securities
Amortized cost, equity securities		11,375
Gross unrealized gains, equity securities		1,166
Gross unrealized losses, equity securities		0
Estimated fair value, equity securities		12,541
Common stock
Available-for-sale securities
Amortized cost, equity securities	12,865	12,865
Gross unrealized gains, equity securities	0	0
Gross unrealized losses, equity securities	133	176
Estimated fair value, equity securities	$ 12,732	$ 12,689

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