Fair Value Measurements (Details) - Recurring - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Fair Value of Investments Measured on Recurring Basis [Line Items]
Fair value	$ 655,987	$ 567,962
Level 1
Fair Value of Investments Measured on Recurring Basis [Line Items]
Fair value	46,509	39,598
Level 2
Fair Value of Investments Measured on Recurring Basis [Line Items]
Fair value	609,478	528,364
Level 3
Fair Value of Investments Measured on Recurring Basis [Line Items]
Fair value	0	0
Fixed maturities [Member]
Fair Value of Investments Measured on Recurring Basis [Line Items]
Fair value - available for sale	590,077	510,251
Fixed maturities [Member] | Level 1
Fair Value of Investments Measured on Recurring Basis [Line Items]
Fair value - available for sale	113	611
Fixed maturities [Member] | Level 2
Fair Value of Investments Measured on Recurring Basis [Line Items]
Fair value - available for sale	589,964	509,640
Fixed maturities [Member] | Level 3
Fair Value of Investments Measured on Recurring Basis [Line Items]
Fair value - available for sale	0	0
U.S. Treasury securities and obligations of U.S. government agencies [Member]
Fair Value of Investments Measured on Recurring Basis [Line Items]
Fair value - available for sale	113	611
U.S. Treasury securities and obligations of U.S. government agencies [Member] | Level 1
Fair Value of Investments Measured on Recurring Basis [Line Items]
Fair value - available for sale	113	611
U.S. Treasury securities and obligations of U.S. government agencies [Member] | Level 2
Fair Value of Investments Measured on Recurring Basis [Line Items]
Fair value - available for sale	0	0
U.S. Treasury securities and obligations of U.S. government agencies [Member] | Level 3
Fair Value of Investments Measured on Recurring Basis [Line Items]
Fair value - available for sale	0	0
Obligations of states, municipalities and political subdivisions [Member]
Fair Value of Investments Measured on Recurring Basis [Line Items]
Fair value - available for sale	131,961	154,600
Obligations of states, municipalities and political subdivisions [Member] | Level 1
Fair Value of Investments Measured on Recurring Basis [Line Items]
Fair value - available for sale	0	0
Obligations of states, municipalities and political subdivisions [Member] | Level 2
Fair Value of Investments Measured on Recurring Basis [Line Items]
Fair value - available for sale	131,961	154,600
Obligations of states, municipalities and political subdivisions [Member] | Level 3
Fair Value of Investments Measured on Recurring Basis [Line Items]
Fair value - available for sale	0	0
Corporate and other securities [Member]
Fair Value of Investments Measured on Recurring Basis [Line Items]
Fair value - available for sale	129,216	96,752
Corporate and other securities [Member] | Level 1
Fair Value of Investments Measured on Recurring Basis [Line Items]
Fair value - available for sale	0	0
Corporate and other securities [Member] | Level 2
Fair Value of Investments Measured on Recurring Basis [Line Items]
Fair value - available for sale	129,216	96,752
Corporate and other securities [Member] | Level 3
Fair Value of Investments Measured on Recurring Basis [Line Items]
Fair value - available for sale	0	0
Commercial mortgage and asset-backed securities [Member]
Fair Value of Investments Measured on Recurring Basis [Line Items]
Fair value - available for sale	177,865	149,867
Commercial mortgage and asset-backed securities [Member] | Level 1
Fair Value of Investments Measured on Recurring Basis [Line Items]
Fair value - available for sale	0	0
Commercial mortgage and asset-backed securities [Member] | Level 2
Fair Value of Investments Measured on Recurring Basis [Line Items]
Fair value - available for sale	177,865	149,867
Commercial mortgage and asset-backed securities [Member] | Level 3
Fair Value of Investments Measured on Recurring Basis [Line Items]
Fair value - available for sale	0	0
Residential mortgage-backed securities [Member]
Fair Value of Investments Measured on Recurring Basis [Line Items]
Fair value - available for sale	150,922	108,421
Residential mortgage-backed securities [Member] | Level 1
Fair Value of Investments Measured on Recurring Basis [Line Items]
Fair value - available for sale	0	0
Residential mortgage-backed securities [Member] | Level 2
Fair Value of Investments Measured on Recurring Basis [Line Items]
Fair value - available for sale	150,922	108,421
Residential mortgage-backed securities [Member] | Level 3
Fair Value of Investments Measured on Recurring Basis [Line Items]
Fair value - available for sale	0	0
Equity securities [Member]
Fair Value of Investments Measured on Recurring Basis [Line Items]
Fair value	65,910	57,711
Equity securities [Member] | Level 1
Fair Value of Investments Measured on Recurring Basis [Line Items]
Fair value	46,396	38,987
Equity securities [Member] | Level 2
Fair Value of Investments Measured on Recurring Basis [Line Items]
Fair value	19,514	18,724
Equity securities [Member] | Level 3
Fair Value of Investments Measured on Recurring Basis [Line Items]
Fair value	0	0
Exchange traded funds [Member]
Fair Value of Investments Measured on Recurring Basis [Line Items]
Fair value	46,396	38,987
Exchange traded funds [Member] | Level 1
Fair Value of Investments Measured on Recurring Basis [Line Items]
Fair value	46,396	38,987
Exchange traded funds [Member] | Level 2
Fair Value of Investments Measured on Recurring Basis [Line Items]
Fair value	0	0
Exchange traded funds [Member] | Level 3
Fair Value of Investments Measured on Recurring Basis [Line Items]
Fair value	0	0
Nonredeemable preferred stock [Member]
Fair Value of Investments Measured on Recurring Basis [Line Items]
Fair value	19,514	18,724
Nonredeemable preferred stock [Member] | Level 1
Fair Value of Investments Measured on Recurring Basis [Line Items]
Fair value	0	0
Nonredeemable preferred stock [Member] | Level 2
Fair Value of Investments Measured on Recurring Basis [Line Items]
Fair value	19,514	18,724
Nonredeemable preferred stock [Member] | Level 3
Fair Value of Investments Measured on Recurring Basis [Line Items]
Fair value	$ 0	$ 0