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Note 6 - Fair Value Measurements - Assets and Liabilities at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Securities available for sale	$ 657,410	$ 686,080
Securities available for sale	657,410	686,080
Fair Value, Inputs, Level 1 [Member]
Securities available for sale	0	0
Securities available for sale	0	0
Fair Value, Inputs, Level 2 [Member]
Securities available for sale	657,410	686,080
Securities available for sale	657,410	686,080
Fair Value, Inputs, Level 3 [Member]
Securities available for sale	0	0
Securities available for sale	0	0
US Treasury Securities [Member]
Securities available for sale	932
Securities available for sale	932
US Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Securities available for sale	0
Securities available for sale	0
US Treasury Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Securities available for sale	932
Securities available for sale	932
US Treasury Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Securities available for sale	0
Securities available for sale	0
US Government Agencies Debt Securities [Member]
Securities available for sale	334,530	278,019
Securities available for sale	334,530	278,019
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Securities available for sale	0	0
Securities available for sale	0	0
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Securities available for sale	334,530	278,019
Securities available for sale	334,530	278,019
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Securities available for sale	0	0
Securities available for sale	0	0
US States and Political Subdivisions Debt Securities [Member]
Securities available for sale	149,160	198,672
Securities available for sale	149,160	198,672
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Securities available for sale	0	0
Securities available for sale	0	0
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Securities available for sale	149,160	198,672
Securities available for sale	149,160	198,672
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Securities available for sale	0	0
Securities available for sale	0	0
Collateralized Mortgage-Backed Securities [Member]
Securities available for sale	167,244	206,174
Securities available for sale	167,244	206,174
Collateralized Mortgage-Backed Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Securities available for sale	0	0
Securities available for sale	0	0
Collateralized Mortgage-Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Securities available for sale	167,244	206,174
Securities available for sale	167,244	206,174
Collateralized Mortgage-Backed Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Securities available for sale	0	0
Securities available for sale	0	0
Corporate Debt Securities [Member]
Securities available for sale	5,544	3,215
Securities available for sale	5,544	3,215
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Securities available for sale	0	0
Securities available for sale	0	0
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Securities available for sale	5,544	3,215
Securities available for sale	5,544	3,215
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Securities available for sale	0	0
Securities available for sale	$ 0	$ 0

X

- Definition

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(6))
-URI https://asc.fasb.org/extlink&oid=126897435&loc=d3e534808-122878

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 30
-Section 45
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 1
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=124260329&loc=d3e26610-111562

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (aa)
-URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563

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