Schedule II - Condensed Financial Information of Registrant (Parent Company Only) (Cash Flows) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Cash flows from operating activities:
Net loss	$ (91,655)	$ (625)
Adjustments to reconcile net loss to cash provided by operating activities:
Depreciation and amortization expense	5,754	5,365
Deferred tax (benefit) expense	(6,513)	817
Change in current federal income tax (recoverable) payable	(16,647)	(8,999)
Change in all other liabilities	(4,452)	5,158
Change in all other assets	5,018	4,273
Net cash (used in) provided by operating activities	(69,327)	27,670
Cash flows from investing activities:
Purchases of property and equipment	(1,667)	(4,188)
Purchase of investment securities	(285,507)	(259,769)
Maturities, sales and redemptions of investment securities	409,861	231,603
Net cash provided by (used in) investing activities	122,687	(32,354)
Cash flows from financing activities:
Proceeds from exercise of employee stock options		1,520
Payment of revolving credit facility		(30,000)
Payment of debt issuance costs		(979)
Proceeds from senior unsecured note offering		50,000
Purchase of treasury shares		(1,380)
Net cash provided by financing activities		19,161
Increase in cash and cash equivalents and restricted cash	53,360	14,477
Cash and cash equivalents and restricted cash at beginning of period	54,948	40,471
Cash and cash equivalents and restricted cash at end of period	108,308	54,948
Supplemental cash flow information:
Interest paid	4,860	4,289
Income taxes paid (recovered)	653	7,775
Parent Company [Member]
Cash flows from operating activities:
Net loss	(91,655)	(625)
Adjustments to reconcile net loss to cash provided by operating activities:
Depreciation and amortization expense	835	381
Deferred tax (benefit) expense	768	(611)
Net realized gains	(744)	(830)
Undistributed share of loss of subsidiaries	110,428	14,183
Change in current federal income tax (recoverable) payable	(6,602)	229
Change in all other liabilities	(17,851)	994
Change in all other assets	14,368	(2,339)
Net cash (used in) provided by operating activities	9,547	11,382
Cash flows from investing activities:
Purchases of property and equipment	(716)	(1,211)
Purchase of investment securities	0	(1,259)
Maturities, sales and redemptions of investment securities	1,598	1,405
Capital contribution to subsidiaries	0	(20,000)
Net cash provided by (used in) investing activities	882	(21,065)
Cash flows from financing activities:
Proceeds from exercise of employee stock options	0	1,520
Payment of revolving credit facility	0	(30,000)
Payment of debt issuance costs	0	(979)
Proceeds from senior unsecured note offering	0	50,000
Purchase of treasury shares	0	(1,380)
Net cash provided by financing activities	0	19,161
Increase in cash and cash equivalents and restricted cash	10,429	9,478
Cash and cash equivalents and restricted cash at beginning of period	19,637	10,159
Cash and cash equivalents and restricted cash at end of period	30,066	19,637
Supplemental cash flow information:
Interest paid	4,860	4,289
Income taxes paid (recovered)	$ 204	$ (448)