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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 |  |  |

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