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Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 14,780	$ 12,257	$ 23,338	$ 29,458
Unrealized gain (loss) on available-for-sale securities:
Unrealized gain (loss) arising during the period	(7,631)	6,380	(21,192)	7,680
Unrealized gain arising from the reclassification of securities held-to-maturity to securities available-for-sale	0	12,845	0	12,845
Reclassification adjustment for gain included in net income	(197)	(642)	(3,901)	(2,602)
Total change in unrealized gain (loss) on available-for-sale securities	(7,828)	18,583	(25,093)	17,923
Total other comprehensive income (loss)	(7,828)	18,583	(25,093)	17,923
Comprehensive income (loss)	$ 6,952	$ 30,840	$ (1,755)	$ 47,381

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