Investments Gross Unrealized Gains and Losses (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Debt Securities, Available-for-Sale, Fair Value to Amortized Cost [Abstract]
Debt Securities, Available-for-sale, Amortized Cost	$ 1,223,747	$ 935,977
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax		41,729
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax		3,097
Available-for-sale Securities		974,609
Equity securities	15,068
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract]
Fixed maturities held-to-maturity, at amortized cost	0	233,961
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain		8,703
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss		1,287
Fixed maturities held-to-maturity, fair value	0	241,377
Equity Securities, FV-NI and without Readily Determinable Fair Value [Abstract]
Available-for-sale equity securities, amortized cost basis		15,289
Equity securities		16,164
US Treasury Securities [Member]
Debt Securities, Available-for-Sale, Fair Value to Amortized Cost [Abstract]
Debt Securities, Available-for-sale, Amortized Cost	9,864	9,860
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	1,410	1,948
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	0	0
Available-for-sale Securities	11,274	11,808
US Government Agencies Debt Securities [Member]
Debt Securities, Available-for-Sale, Fair Value to Amortized Cost [Abstract]
Debt Securities, Available-for-sale, Amortized Cost	3,540	3,570
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	740	926
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	0	0
Available-for-sale Securities	4,280	4,496
US States and Political Subdivisions Debt Securities [Member]
Debt Securities, Available-for-Sale, Fair Value to Amortized Cost [Abstract]
Debt Securities, Available-for-sale, Amortized Cost	713,991	550,536
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	7,614	18,507
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	1,490	1,540
Available-for-sale Securities	720,115	567,503
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract]
Fixed maturities held-to-maturity, at amortized cost		213,054
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain		7,585
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss		629
Fixed maturities held-to-maturity, fair value		220,010
Corporate Debt Securities [Member]
Debt Securities, Available-for-Sale, Fair Value to Amortized Cost [Abstract]
Debt Securities, Available-for-sale, Amortized Cost	384,817	370,043
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	6,725	20,212
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	9,746	1,552
Available-for-sale Securities	381,796	388,703
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract]
Fixed maturities held-to-maturity, at amortized cost		20,907
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain		1,118
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss		658
Fixed maturities held-to-maturity, fair value		21,367
Commercial Mortgage Backed Securities [Member]
Debt Securities, Available-for-Sale, Fair Value to Amortized Cost [Abstract]
Debt Securities, Available-for-sale, Amortized Cost	39,694
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	386
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	66
Available-for-sale Securities	40,014
Residential Mortgage Backed Securities [Member]
Debt Securities, Available-for-Sale, Fair Value to Amortized Cost [Abstract]
Debt Securities, Available-for-sale, Amortized Cost	66,960	1,865
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	1,726	118
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	2	5
Available-for-sale Securities	68,684	1,978
Asset-backed Securities [Member]
Debt Securities, Available-for-Sale, Fair Value to Amortized Cost [Abstract]
Debt Securities, Available-for-sale, Amortized Cost	4,764
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	1
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	8
Available-for-sale Securities	4,757
Foreign Governments [Member]
Debt Securities, Available-for-Sale, Fair Value to Amortized Cost [Abstract]
Debt Securities, Available-for-sale, Amortized Cost	117	103
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	2	18
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	0	0
Available-for-sale Securities	119	121
Debt Securities [Member]
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract]
Total Fixed maturity securities, Amortized Cost	1,223,747	1,169,938
Debt Securities, Accumulative Gross Unrealized and Unrecognized Gains	18,604	50,432
Debt Securities, Accumulated Gross Unrealized and Unrecognized Losses	11,312	4,384
Total Fixed Maturity Securities, Fair Value	1,231,039	1,215,986
Stock Mutual Funds [Member]
Debt Securities, Available-for-Sale, Fair Value to Amortized Cost [Abstract]
Available-for-sale Securities		3,217
Equity securities	2,906
Equity Securities, FV-NI and without Readily Determinable Fair Value [Abstract]
Available-for-sale equity securities, amortized cost basis		2,867
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax		350
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax		0
Equity securities		3,217
Bond Mutual Funds [Member]
Debt Securities, Available-for-Sale, Fair Value to Amortized Cost [Abstract]
Available-for-sale Securities		12,367
Equity securities	11,774
Equity Securities, FV-NI and without Readily Determinable Fair Value [Abstract]
Available-for-sale equity securities, amortized cost basis		11,880
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax		487
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax		0
Equity securities		12,367
Common Stock [Member]
Debt Securities, Available-for-Sale, Fair Value to Amortized Cost [Abstract]
Available-for-sale Securities		24
Equity securities	94
Equity Securities, FV-NI and without Readily Determinable Fair Value [Abstract]
Available-for-sale equity securities, amortized cost basis		22
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax		2
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax		0
Equity securities		24
Nonredeemable Preferred Stock [Member]
Debt Securities, Available-for-Sale, Fair Value to Amortized Cost [Abstract]
Equity securities	294
Preferred Stock [Member]
Debt Securities, Available-for-Sale, Fair Value to Amortized Cost [Abstract]
Available-for-sale Securities		556
Equity Securities, FV-NI and without Readily Determinable Fair Value [Abstract]
Available-for-sale equity securities, amortized cost basis		520
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax		42
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax		6
Equity securities		556
Equity Securities [Member]
Debt Securities, Available-for-Sale, Fair Value to Amortized Cost [Abstract]
Available-for-sale Securities		16,164
Equity securities	$ 15,068
Equity Securities, FV-NI and without Readily Determinable Fair Value [Abstract]
Available-for-sale equity securities, amortized cost basis		15,289
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax		881
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax		6
Equity securities		$ 16,164