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Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 31,436	$ 32,142	$ 36,106	$ 33,386	[1]
Other comprehensive income (loss):
Change in net unrealized gain (loss) on securities	(35,993)	7,969	(43,472)	(37,300)
Losses realized in net income	166	144	1,176	1,378
Total available for sale adjustment	(35,827)	8,113	(42,296)	(35,922)
LESS: Deferred income tax effect	(8,879)	3,076	(11,964)	(13,016)
Total other comprehensive income (loss)	(26,948)	5,037	(30,332)	(22,906)
Total comprehensive income	$ 4,488	$ 37,179	$ 5,774	$ 10,480
[1] See Note 1. Basis of Presentation for further discussion on the current presentation.

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