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Note 5 - Fair Value Measurements - Assets Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Available for sale securities	$ 828,389	$ 831,003
US Treasury Securities [Member]
Available for sale securities	208,130	190,479
US Government Agencies Debt Securities [Member]
Available for sale securities	110,149	116,014
Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member]
Available for sale securities	130,907	149,601
US States and Political Subdivisions Debt Securities [Member]
Available for sale securities	298,733	292,859
Corporate Debt Securities [Member]
Available for sale securities	80,470	82,050
Fair Value, Recurring [Member]
Fair value hedges, Assets	733
Derivative financial instruments		527
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair value hedges, Assets	0
Derivative financial instruments		0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair value hedges, Assets	733
Derivative financial instruments		527
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair value hedges, Assets	0
Derivative financial instruments		0
Fair Value, Recurring [Member] | US Treasury Securities [Member]
Available for sale securities	208,130	190,479
Fair Value, Recurring [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Available for sale securities	208,130	190,479
Fair Value, Recurring [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Available for sale securities	0	0
Fair Value, Recurring [Member] | US Treasury Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Available for sale securities	0	0
Fair Value, Recurring [Member] | US Government Agencies Debt Securities [Member]
Available for sale securities	110,149	116,014
Fair Value, Recurring [Member] | US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Available for sale securities	0	0
Fair Value, Recurring [Member] | US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Available for sale securities	110,149	116,014
Fair Value, Recurring [Member] | US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Available for sale securities	0	0
Fair Value, Recurring [Member] | Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member]
Available for sale securities	130,907	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
Fair Value, Recurring [Member] | Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member] | Fair Value, Inputs, Level 2 [Member]
Available for sale securities	130,907	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
Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member]
Available for sale securities	298,733	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
Fair Value, Recurring [Member] | US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Available for sale securities	298,733	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
Fair Value, Recurring [Member] | Corporate Debt Securities [Member]
Available for sale securities	80,470	82,050
Fair Value, Recurring [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Available for sale securities	0	0
Fair Value, Recurring [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Available for sale securities	80,470	82,050
Fair Value, Recurring [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Available for sale securities	$ 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

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 210
-Section S99
-Paragraph 1
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