CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 28,106	$ 16,418
Other comprehensive income (loss):
Unrealized (depreciation) appreciation of available-for-sale securities	(14,658)	16,717
Reclassification adjustment for realized gains included in net income	0	(280)
Income tax effect	3,530	(3,958)
Other comprehensive (loss) income, net of tax	(11,128)	12,479
Comprehensive income	16,978	28,897
Comprehensive (income) loss attributable to noncontrolling interests	(1)	(5)
Comprehensive income available to common shareholders	$ 16,977	$ 28,892