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Business Combinations - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended	6 Months Ended
	Oct. 01, 2018	Mar. 31, 2019	Sep. 30, 2019	Mar. 31, 2019	Mar. 31, 2018
Business Acquisition [Line Items]
Business combination, number of shares transferred (shares)				904,826
Goodwill acquired				$ 9,481
South Sound Merger
Business Acquisition [Line Items]
Business combination, number of shares transferred (shares)	904,826
Issued, value assigned	$ 28,270
Business combination, share price (dollars per share)	$ 31.24
Cash paid	$ 6,900
Total merger consideration	35,170
Goodwill acquired	$ 9,480
Acquisition related costs		$ 55		$ 119	$ 89
Timberland Bank | South Sound Merger
Business Acquisition [Line Items]
Shares issued (in dollars per share)	$ 0.746
South Sound Bank | South Sound Merger
Business Acquisition [Line Items]
Shares issued (in dollars per share)	$ 5.68825
Acquisition related costs					$ 30
Forecast | South Sound Merger
Business Acquisition [Line Items]
Acquisition related costs			$ 700

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Value of equity interests (such as common shares, preferred shares, or partnership interest) issued or issuable to acquire the entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (b)(4)
-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Price of a single share of a number of saleable stocks paid or offered to be paid in a business combination.

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This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 25
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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

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Per share or per unit amount of equity securities issued.

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