CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Statement of Comprehensive Income [Abstract]
NET INCOME	$ 136,515	$ 60,776	$ 85,385
Unrealized holding loss on securities—available-for-sale arising during the period	(6,547)	(3,318)	(3,940)
Reclassification for net losses (gains) on securities—available-for-sale realized in earnings	839	2,109	(311)
Other Comprehensive Income (Loss), Financial Liability, Fair Value Option, before Tax, after Reclassification Adjustment	(15,384)	0	0
Other Comprehensive Income (Loss), Tax	5,028	423	1,526
OTHER COMPREHENSIVE LOSS, NET OF INCOME TAXES:
Other comprehensive loss	(16,064)	(786)	(2,725)
COMPREHENSIVE INCOME	$ 120,451	$ 59,990	$ 82,660