CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 81,461	$ 92,015	$ 82,414
Other comprehensive income (loss):
Unrealized appreciation (depreciation) of investment securities available-for-sale	17,666	20,875	(9,073)
Reclassification adjustment for realized (gains) losses included in net income	(279)	0	345
Income tax effect	(4,188)	(5,027)	2,102
Other comprehensive income (loss), net of tax	13,199	15,848	(6,626)
Comprehensive income	94,660	107,863	75,788
Comprehensive (income) loss attributable to noncontrolling interests	(24)	(55)	0
Comprehensive income available to common shareholders	$ 94,636	$ 107,808	$ 75,788