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Significant Accounting Policies - Narrative (Details) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Accounting Policies [Abstract]          
ASU 2016-13 Effect on Retained Earnings   $ 262      
Allowance for Uncollectible Premium   $ 140 $ 302    
Finite-Lived Intangible Asset, Useful Life   7 years      
Advertising Expense   $ 1,212 1,426 $ 1,674  
Concentration Risk, Percentage   57.00%      
Cash, FDIC Insured Amount   $ 320,514 303,021    
Financing Receivable, Allowance for Credit Loss [Line Items]          
Premium Receivable, Allowance for Credit Loss   140 165 405 $ 384
Reinsurance Recoverable, Allowance for Credit Loss   386 256    
Financing Receivable, Allowance for Credit Loss   20 141    
Total Credit Loss Allowances   546 562    
Charged to Costs and Expenses   (311) 216 597  
Reinsurance Recoverable, Credit Loss Expense (Reversal)   130      
Financing Receivable, Allowance for Credit Loss, Writeoff   0      
Financing Receivable, Credit Loss, Expense (Reversal)   (121)      
Total Credit Loss Allowance Writeoffs   286      
Change in Credit Loss Allowance   (302)      
Premium Receivable, Allowance for Credit Loss, Writeoff   286 $ 319 $ 576  
Reinsurance recoverable, allowance for credit loss, writeoff   0      
Tax Cuts and Jobs Act, Income Tax Expense (Benefit) $ 5,263        
Tax Cuts and Jobs Act, Change in Tax Rate, Income Tax Expense (Benefit)   $ 12,566