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Note 5 - Fair Value Measurements - Assets Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Available for sale securities	$ 823,897	$ 831,003
Securities available-for-sale	823,897	831,003
US Treasury Securities [Member]
Available for sale securities	200,887	190,479
Securities available-for-sale	200,887	190,479
US Government Agencies Debt Securities [Member]
Available for sale securities	112,168	116,014
Securities available-for-sale	112,168	116,014
Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member]
Available for sale securities	142,507	149,601
Securities available-for-sale	142,507	149,601
US States and Political Subdivisions Debt Securities [Member]
Available for sale securities	289,213	292,859
Securities available-for-sale	289,213	292,859
Corporate Debt Securities [Member]
Available for sale securities	79,122	82,050
Securities available-for-sale	79,122	82,050
Fair Value, Recurring [Member]
Available for sale securities	823,897	831,003
Securities available-for-sale	823,897	831,003
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Available for sale securities	200,887	190,479
Securities available-for-sale	200,887	190,479
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Available for sale securities	623,010	640,524
Securities available-for-sale	623,010	640,524
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Available for sale securities	0	0
Securities available-for-sale	0	0
Fair Value, Recurring [Member] | US Treasury Securities [Member]
Available for sale securities	200,887	190,479
Securities available-for-sale	200,887	190,479
Fair Value, Recurring [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Available for sale securities	200,887	190,479
Securities available-for-sale	200,887	190,479
Fair Value, Recurring [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Available for sale securities	0	0
Securities available-for-sale	0	0
Fair Value, Recurring [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Available for sale securities	0	0
Securities available-for-sale	0	0
Fair Value, Recurring [Member] | US Government Agencies Debt Securities [Member]
Available for sale securities	112,168	116,014
Securities available-for-sale	112,168	116,014
Fair Value, Recurring [Member] | US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Available for sale securities	0	0
Securities available-for-sale	0	0
Fair Value, Recurring [Member] | US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Available for sale securities	112,168	116,014
Securities available-for-sale	112,168	116,014
Fair Value, Recurring [Member] | US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Available for sale securities	0	0
Securities available-for-sale	0	0
Fair Value, Recurring [Member] | Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member]
Available for sale securities	142,507	149,601
Securities available-for-sale	142,507	149,601
Fair Value, Recurring [Member] | Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member] | Fair Value, Inputs, Level 1 [Member]
Available for sale securities	0	0
Securities available-for-sale	0	0
Fair Value, Recurring [Member] | Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member] | Fair Value, Inputs, Level 2 [Member]
Available for sale securities	142,507	149,601
Securities available-for-sale	142,507	149,601
Fair Value, Recurring [Member] | Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member] | Fair Value, Inputs, Level 3 [Member]
Available for sale securities	0	0
Securities available-for-sale	0	0
Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member]
Available for sale securities	289,213	292,859
Securities available-for-sale	289,213	292,859
Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Available for sale securities	0	0
Securities available-for-sale	0	0
Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Available for sale securities	289,213	292,859
Securities available-for-sale	289,213	292,859
Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Available for sale securities	0	0
Securities available-for-sale	0	0
Fair Value, Recurring [Member] | Corporate Debt Securities [Member]
Available for sale securities	79,122	82,050
Securities available-for-sale	79,122	82,050
Fair Value, Recurring [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Available for sale securities	0	0
Securities available-for-sale	0	0
Fair Value, Recurring [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Available for sale securities	79,122	82,050
Securities available-for-sale	79,122	82,050
Fair Value, Recurring [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Available for sale securities	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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