CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 30,235	$ 18,526	$ 58,341	$ 34,944
Other comprehensive income (loss):
Unrealized (depreciation) appreciation of available-for-sale securities	(204)	2,946	(14,862)	19,663
Reclassification adjustment for realized losses (gains) included in net income	680	1	680	(279)
Income tax effect	(115)	(710)	3,415	(4,668)
Other comprehensive income (loss), net of tax	361	2,237	(10,767)	14,716
Comprehensive income	30,596	20,763	47,574	49,660
Comprehensive (income) loss attributable to noncontrolling interests	(12)	(24)	(13)	(29)
Comprehensive income available to common shareholders	$ 30,584	$ 20,739	$ 47,561	$ 49,631