Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 115,416	$ 62,072	$ 30,205
Unrealized (loss) gain on securities available-for-sale:
Unrealized (loss) gain arising during the period	11,140	(1,614)	2,020
Reclassification adjustment for gain included in net income	(17,187)	(1,890)	(685)
Total change in unrealized loss (gain) on securities available-for-sale	(6,047)	(3,504)	1,335
Unrealized gain (loss) on cash flow hedge:
Unrealized loss arising during the period	0	(396)	(362)
Reclassification adjustment for loss included in net income	0	532	0
Total change in unrealized gain (loss) on cash flow hedge	0	136	(362)
Total other comprehensive (loss) income	(6,047)	(3,368)	973
Comprehensive income	$ 109,369	$ 58,704	$ 31,178