Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Consolidated Statements of Comprehensive Income (Loss) [Abstract]
Net income (loss)	$ 52,646	$ 59,186	$ (2,504)
Other comprehensive income (loss) before tax:
Unrealized gain (loss) on securities available-for-sale	2,276	(5,023)	(8,814)
Realized gain on investment securities included in net income	(6,896)	(12,207)	(2,572)
Other Than Temporary Impairment on securities included in net income	0	0	1,490
Unrealized (loss) gain on cash flow hedges	494	3,303	4,278
Other comprehensive (loss) income before taxes	(4,126)	(13,927)	(5,618)
Income tax effect	(419)	1,526	(96)
Other Comprehensive Income (Loss) After taxes	(4,545)	(12,401)	(5,714)
Comprehensive income (loss)	$ 48,101	$ 46,785	$ (8,218)