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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	$ 45,472	$ 57,709	$ 115,416
Unrealized gain (loss) on securities available-for-sale:
Unrealized (loss) gain arising during the period	(28,230)	10,068	11,140
Unrealized gain arising from the reclassification of securities held-to-maturity to securities available-for-sale	0	12,845	0
Reclassification adjustment for gain included in net income	(3,906)	(8,644)	(17,187)
Reclassification adjustment for OTTI loss included in net income	2,296	0	0
Total change in unrealized (loss) gain on securities available-for-sale	(29,840)	14,269	(6,047)
Total other comprehensive (loss) income	(29,840)	14,269	(6,047)
Comprehensive income	$ 15,632	$ 71,978	$ 109,369

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