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Note 5 - Credit Quality - Loans Modified as Troubled Debt Restructurings (Details) $ in Thousands		12 Months Ended
		Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Total contracts		6	7
Pre-modification recorded investment		$ 525	$ 1,361
Post-modification recorded investment	[1]	$ 513	$ 1,361
Below Market Interest Rate [Member] | Single Family Owner Occupied [Member]
Total contracts		1	0
Pre-modification recorded investment		$ 31	$ 0
Post-modification recorded investment	[1]	$ 32	$ 0
Below Market Interest Rate and Extended Payment Term [Member]
Total contracts		0	5
Pre-modification recorded investment		$ 0	$ 567
Post-modification recorded investment	[1]	$ 0	$ 567
Below Market Interest Rate and Extended Payment Term [Member] | Single Family Owner Occupied [Member]
Total contracts		0	4
Pre-modification recorded investment		$ 0	$ 402
Post-modification recorded investment	[1]	$ 0	$ 402
Below Market Interest Rate and Extended Payment Term [Member] | Single Family Non-owner Occupied [Member]
Total contracts		0	1
Pre-modification recorded investment		$ 0	$ 165
Post-modification recorded investment	[1]	$ 0	$ 165
Payment Deferral [Member]
Total contracts		5	2
Pre-modification recorded investment		$ 494	$ 794
Post-modification recorded investment	[1]	$ 481	$ 794
Payment Deferral [Member] | Single Family Owner Occupied [Member]
Total contracts		5	1
Pre-modification recorded investment		$ 494	$ 41
Post-modification recorded investment		$ 481	$ 41
Payment Deferral [Member] | Single Family Non-owner Occupied [Member]
Total contracts		0	1
Pre-modification recorded investment		$ 0	$ 753
Post-modification recorded investment	[1]	$ 0	$ 753
[1] Represents the loan balance immediately following modification

X

- Definition

Number of financing receivables that have been modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI https://asc.fasb.org/extlink&oid=123577603&loc=SL6953676-111524

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X

- Definition

Amount, after troubled debt restructuring, of modified financing receivable.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI https://asc.fasb.org/extlink&oid=123577603&loc=SL6953676-111524

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X

- Definition

Amount, before troubled debt restructuring, of financing receivable to be modified.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI https://asc.fasb.org/extlink&oid=123577603&loc=SL6953676-111524

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