Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Net income	$ 10,881,000	$ 7,615,000
Other comprehensive income (loss):
Unrealized holding gains (losses) on securities available for sale	(7,142,000)	980,000
Fair value of interest rate swap	2,000	42,000
Total other comprehensive income (loss)	(7,140,000)	1,022,000
Tax effect of unrealized holding gains (losses) on securities available for sale	1,500,000	(343,000)
Tax effect of fair value of interest rate swap	(1,000)	(15,000)
Total tax effect of other comprehensive income	1,499,000	(358,000)
Other comprehensive income (loss), net of tax effect	(5,641,000)	664,000
Comprehensive income	$ 5,240,000	$ 8,279,000