Investments - Disposition of Fixed Income and Equity Securities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Sales | Debt Securities | Available for sale securities
Summary of the disposition of fixed income and equity securities
Proceeds From Sales	$ 21,273	$ 19,858
Gross Realized Gains	1,003	2,270
Gross Realized Losses	(27)	(102)
Net Realized Gain (Loss)	976	2,168
Sales | Equity Securities
Summary of the disposition of fixed income and equity securities
Proceeds From Sales	47,638	38,042
Gross Realized Gains	14,233	17,792
Gross Realized Losses	(1,150)	(2,633)
Net Realized Gain (Loss)	13,083	15,159
Calls/Maturities | Debt Securities | Available for sale securities
Summary of the disposition of fixed income and equity securities
Proceeds From Sales	96,285	54,890
Gross Realized Gains	255	145
Gross Realized Losses	(48)	(7)
Net Realized Gain (Loss)	$ 207	$ 138