Consolidated Statement of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 161,441	$ 121,027	$ 73,548
Other comprehensive income (loss)
Net unrealized holding gains (losses) arising during period on investment securities available for sale, net of tax expense (benefit) of $6,211, ($849) and ($169)	23,365	(3,196)	(314)
Reclassification adjustment for gains on investment securities included in earnings, net of tax of $12, $19 and $13	(46)	(70)	(24)
Net unrealized gains (losses) on cash flow hedge during the period, net of tax expense (benefit) of ($133), $30 and $63	(498)	112
Net unrealized gains (losses) on cash flow hedge during the period, net of tax expense (benefit) of $-, $30 and $63			116
Total other comprehensive income (loss)	22,821	(3,154)	(222)
Comprehensive income	$ 184,262	$ 117,873	$ 73,326