CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 32,481	$ 20,054	$ 90,822	$ 54,998
Other comprehensive income (loss):
Unrealized (depreciation) appreciation of available-for-sale securities	(6,833)	(303)	(21,695)	19,360
Reclassification adjustment for realized losses (gains) included in net income	0	0	680	(279)
Income tax effect	1,646	73	5,061	(4,595)
Other comprehensive (loss) income, net of tax	(5,187)	(230)	(15,954)	14,486
Comprehensive income	27,294	19,824	74,868	69,484
Comprehensive loss (income) attributable to noncontrolling interests	2	4	(11)	(25)
Comprehensive income available to common shareholders	$ 27,296	$ 19,828	$ 74,857	$ 69,459