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Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2017	Mar. 31, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 32,142	$ 14,283	$ 33,386	$ 18,341
Other comprehensive income (loss):
Change in net unrealized gain (loss) on securities	7,969	16,216	(37,300)	18,837
Losses (gains) realized in net income	144	(29)	1,378	(50)
Total available for sale adjustment	8,113	16,187	(35,922)	18,787
LESS: Deferred income tax effect	3,076	5,938	(13,016)	6,913
Total other comprehensive income (loss)	5,037	10,249	(22,906)	11,874
Total comprehensive income	$ 37,179	$ 24,532	$ 10,480	$ 30,215

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