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Note 7 - Loans Receivable and Credit Disclosures - Loans Receivable Impairment Analysis (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Individually evaluated for credit losses	$ 11,443	$ 14,386
Collectively evaluated for credit losses	1,228,871	1,227,322
Balance March 31, 2023	1,240,314	1,241,708
Construction Real Estate [Member]
Individually evaluated for credit losses	0	0
Collectively evaluated for credit losses	59,756	51,253
Balance March 31, 2023	59,756	51,253
Family Residential Real Estate 1-4 [Member]
Individually evaluated for credit losses	817	805
Collectively evaluated for credit losses	285,601	284,302
Balance March 31, 2023	286,418	285,107
Multifamily [Member]
Individually evaluated for credit losses	0	0
Collectively evaluated for credit losses	193,566	185,784
Balance March 31, 2023	193,566	185,784
Commercial Real Estate Portfolio Segment [Member]
Individually evaluated for credit losses	9,176	12,853
Collectively evaluated for credit losses	341,823	340,432
Balance March 31, 2023	350,999	353,285
Agriculture Real Estate [Member]
Individually evaluated for credit losses	494	165
Collectively evaluated for credit losses	157,843	159,283
Balance March 31, 2023	158,337	159,448
Commercial Portfolio Segment [Member]
Individually evaluated for credit losses	188	200
Collectively evaluated for credit losses	82,157	77,065
Balance March 31, 2023	82,345	77,265
Agriculture [Member]
Individually evaluated for credit losses	752	342
Collectively evaluated for credit losses	91,650	113,013
Balance March 31, 2023	92,402	113,355
Consumer and Other [Member]
Individually evaluated for credit losses	16	21
Collectively evaluated for credit losses	16,475	16,190
Balance March 31, 2023	$ 16,491	$ 16,211

X

- Definition

Amortized cost, before allowance for credit loss, fee, and loan in process, of financing receivable. Excludes financing receivable covered under loss sharing agreement and net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-5

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481990/310-10-45-2

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(7))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1

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Balance Type:	debit
Period Type:	instant

X

- Definition

The balance of financing receivables that were collectively evaluated for impairment.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 4
-Subparagraph (SAB Topic 6.L(5)(a))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480418/310-10-S99-4

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 11C
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481962/310-10-50-11C

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X

- Definition

The balance of financing receivables that were individually evaluated for impairment.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 11C
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481962/310-10-50-11C

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 4
-Subparagraph (SAB Topic 6.L(5)(a))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480418/310-10-S99-4

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