Income Taxes - Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Deferred tax assets:
Loss reserves	$ 13,289	$ 11,342
Loss reserves transitional adjustment	6,104	6,954
Unearned premiums	16,785	14,985
Net operating loss carry forwards – state and local	17,008	16,373
Net operating loss carry forwards – federal	357	16,771
Capital loss carry forwards – federal	1,519	2,577
Bad debt reserve	3,229	3,182
Impairments	517	556
Deferred compensation	5,659	5,613
Amortization of intangibles	695	813
Limited partnership income	2,566
Unrealized depreciation of investments		7,446
Other	3,151	2,211
Total deferred tax assets	70,879	88,823
Less valuation allowance	(17,604)	(16,962)	$ (6,511)
Deferred tax assets, net of allowance	53,275	71,861
Deferred tax liabilities:
Deferred policy acquisition costs	20,693	19,634
Loss reserve transitional adjustment	4,578	6,085
Fair value adjustments	3,628	3,635
Unrealized appreciation of investments	8,669
Limited partnership income		422
Other	10,904	8,846
Total deferred tax liabilities	48,472	38,622
Net deferred income taxes	$ 4,803	$ 33,239