Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statement Of Income And Comprehensive Income [Abstract]
NET INCOME		$ 41,876	$ 35,760	$ 32,569
Other comprehensive income:
Net unrealized holding gains (losses) on available for sale securities		15,836	17,513	(5,343)
Reclassification adjustment for (gains) losses realized in income	[1]	430	11	(283)
Net unrealized holding gains (losses)		16,266	17,524	(5,626)
Income tax effect		(4,060)	(3,668)	1,169
Unrealized holding gains (losses), net of reclassification and tax		12,206	13,856	(4,457)
Other comprehensive income (loss), net of tax		12,206	13,856	(4,457)
TOTAL COMPREHENSIVE INCOME		$ 54,082	$ 49,616	$ 28,112

[1] Pre-tax reclassification adjustments relating to available-for-sale securities are reported in security gains and the tax impact is included in income tax expense on the consolidated statements of income.