CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME [Abstract]
Net income	$ 23,254	$ 20,425	$ 55,913	$ 49,705
Other comprehensive income Securities available-for-sale:
Change in net unrealized gain (loss) during the period	(114)	5,800	20,068	31,890
Amortization of losses previously held as available-for-sale		7	5	22
Other comprehensive income	(114)	5,807	20,073	31,912
Income tax expense related to items of other comprehensive income Securities available-for-sale:
Change in net unrealized gain (loss) during the period	(31)	1,566	5,418	8,610
Amortization of losses previously held as available-for-sale		2	1	6
Income tax expense related to items of other comprehensive income	(31)	1,568	5,419	8,616
Other comprehensive income (loss), net of tax and reclassifications into net income	(83)	4,239	14,654	23,296
Comprehensive income	$ 23,171	$ 24,664	$ 70,567	$ 73,001