Subordinated Debt - Schedule Of Subordinated Debt (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Long-term debt	$ 514,910	$ 525,153
Unamortized discounts and debt issuance costs	(2,472)	(1,125)
Subordinated Debt
Debt Instrument [Line Items]
Long-term debt	72,000	35,000
Unamortized discounts and debt issuance costs	(2,472)	(1,125)
Subordinated Debt | 8% Debenture Due 2021
Debt Instrument [Line Items]
Long-term debt	10,000	10,000
Unamortized discounts and debt issuance costs	(138)	(162)
Subordinated Debt | 6.4375% Notes Due 2025
Debt Instrument [Line Items]
Long-term debt	25,000	25,000
Unamortized discounts and debt issuance costs	(839)	(963)
Subordinated Debt | 6% Notes Due 2021
Debt Instrument [Line Items]
Long-term debt	37,000	0
Unamortized discounts and debt issuance costs	$ (1,495)	$ 0