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Note 8 - Loans Receivable and Credit Disclosures - Loans Receivable Impairment Analysis (Details) - USD ($) $ in Thousands		Jun. 30, 2020	Dec. 31, 2019
Individually evaluated for impairment		$ 17,901	$ 4,788
Collectively evaluated for impairment		1,146,748	1,056,058
Balance		1,164,649	1,060,846
Construction Real Estate [Member]
Individually evaluated for impairment		0	0
Collectively evaluated for impairment		51,045	47,895
Balance		51,045	47,895
Family Residential Real Estate 1-4 [Member]
Individually evaluated for impairment		1,192	1,204
Collectively evaluated for impairment		204,062	200,306
Balance		205,254	201,510
Commercial Real Estate Portfolio Segment [Member]
Individually evaluated for impairment		11,136	83
Collectively evaluated for impairment		451,941	435,767
Balance		463,077	435,850
Agriculture Real Estate [Member]
Individually evaluated for impairment		2,063	84
Collectively evaluated for impairment		158,223	160,687
Balance		160,286	160,771
Commercial Portfolio Segment [Member]
Individually evaluated for impairment		1,775	462
Collectively evaluated for impairment		156,442	83,622
Balance	[1]	158,217	84,084
Agriculture [Member]
Individually evaluated for impairment		1,711	2,951
Collectively evaluated for impairment		107,355	108,994
Balance		109,066	111,945
Consumer and Other [Member]
Individually evaluated for impairment		24	4
Collectively evaluated for impairment		17,680	18,787
Balance		$ 17,704	$ 18,791
[1] Commercial loan portfolio as of June 30, 2020 includes $78.3 million Payroll Protection Program ("PPP") loans

X

- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (h)
-URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524

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- Definition

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (h)
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- Definition

Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=121593590&loc=d3e4428-111522

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