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Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Statement of Comprehensive Income [Abstract]
Unrealized holding loss on investment securities available for sale, tax	$ (21)	$ 2	$ 1	$ 4
Adjustments related to other factors for which OTTI was previously recognized, tax	(1)	(5)	0	2
Amount reclassified to credit loss for previously recorded market loss, tax	2	0	3	1
Accretion of OTTI on investment securities held to maturity, tax	$ 1	$ 2	$ 4	$ 6

X

- Definition

Other Than Temporary Impairment Losses, Investments, Portion In Other Comprehensive Loss, Adjustments Related To Other Factors, Tax, Portion Attributable To Parent, Held-to-maturity Securities

+ References

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Other than Temporary Impairment Losses, Investments, Accretion of Noncredit Portion, Held-to-maturity Securities, Tax

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- Definition

Amount of tax expense (benefit), after reclassification adjustments, of appreciation (loss) in value of unsold available-for-sale securities. Excludes amounts related to other than temporary impairment (OTTI) loss.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 10A
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669646-108580

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-Name Accounting Standards Codification
-Topic 220
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-Section 45
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e640-108580

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Amount of tax (expense) benefit of other than temporary impairment (OTTI) on investment in held-to-maturity debt security, recognized in other comprehensive loss, attributable to the parent entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 10A
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669646-108580

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
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-URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e640-108580

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-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=96868048&loc=SL4569643-111683

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-Section 50
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-URI http://asc.fasb.org/extlink&oid=84161450&loc=SL4573702-111684

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