CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019
Statement of Comprehensive Income [Abstract]
Net income		$ 25,740	$ 41,098	$ 38,718
Other comprehensive income, net of tax:
Unrealized holding gain (loss) on securities available-for-sale arising during the period, net of income taxes	[1]	28,420	(6,054)	10,967
Reclassification adjustment for net gain on sale of securities included in net income, net of income taxes	[2]	(5,534)	(2,618)	(306)
Other comprehensive income (loss), net of tax		22,886	(8,672)	10,661
Comprehensive income, net of tax		$ 48,626	$ 32,426	$ 49,379

[1] Income tax expense (benefit) on the unrealized gain (loss) on securities was $11.4 million for the three months ended March 31, 2020, $(2.6) million for the three months ended December 31, 2019 and $4.5 million for the three months ended March 31, 2019.

[2] Income tax expense (benefit) on the reclassification adjustment for net gain (loss) on sales of securities included in net income was $2.2 million for the three months ended March 31, 2020, $1.1 million for the three months ended December 31, 2019, $121,000 for the three months ended March 31, 2019.