Condensed Consolidated Statements of Comprehensive Income - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Net income	$ 42,024,000	$ 31,274,000	$ 31,913,000
Other comprehensive income (loss):
Unrealized holding gains (losses) on securities available for sale	(4,225,000)	2,297,000	(10,697,000)
Fair value of interest rate swap	2,000	82,000	169,000
Total other comprehensive income (loss)	(4,223,000)	2,379,000	(10,528,000)
Tax effect of unrealized holding gains (losses) on securities available for sale	846,000	(804,000)	3,743,000
Tax effect of fair value of interest rate swap	(1,000)	(28,000)	(59,000)
Total tax effect of other comprehensive income (loss)	845,000	(832,000)	3,684,000
Other comprehensive income (loss), net of tax effect	(3,378,000)	1,547,000	(6,844,000)
Comprehensive income	$ 38,646,000	$ 32,821,000	$ 25,069,000