Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Statement of Comprehensive Income [Abstract]
Unrealized holding loss on investment securities available for sale, tax	$ (41)	$ 3	$ (23)	$ 2
Adjustments related to other factors for which OTTI was previously recognized, tax	0	1	(1)	(1)
Amount reclassified to credit loss for previously recorded market loss, net of income taxes of $0, $0, $0 and $3, respectively	0	0	0	3
Accretion of OTTI on investment securities held to maturity, tax	$ 0	$ 2	$ 4	$ 6