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Note 6 - Allowance for Credit Losses - Changes in Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended										12 Months Ended
	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022		Dec. 31, 2021		Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2022		Dec. 31, 2021		Dec. 31, 2020
Balance				$ 27,858	[1]					$ 26,182	$ 27,858	[1]	$ 26,182
Provision for (recovery of) credit losses charged to operations	$ 3,416	$ 685	$ 510	1,961		$ (846)		$ (1,394)	$ (2,230)	(4,001)	6,572		(8,471)		$ 12,668
Charge-offs											(7,803)		(6,774)
Recoveries											3,929		3,814
Net (charge-offs) recoveries											(3,874)		(2,960)
Balance	30,556					27,858	[1]				30,556		27,858	[1]	26,182
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]
Balance										13,107			13,107
Balance															13,107
Commercial Portfolio Segment [Member]
Balance				14,775						14,661	14,775		14,661
Provision for (recovery of) credit losses charged to operations											431		(6,949)
Charge-offs											(633)		(3,431)
Recoveries											2,640		2,134
Net (charge-offs) recoveries											2,007		(1,297)
Balance	17,213					14,775					17,213		14,775		14,661
Commercial Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]
Balance										8,360			8,360
Balance															8,360
Consumer Real Estate Portfolio Segment [Member]
Balance				9,972						8,951	9,972		8,951
Provision for (recovery of) credit losses charged to operations											(1,121)		(3,653)
Charge-offs											(427)		(318)
Recoveries											507		847
Net (charge-offs) recoveries											80		529
Balance	8,931					9,972					8,931		9,972		8,951
Consumer Real Estate Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]
Balance										4,145			4,145
Balance															4,145
Consumer and Other Portfolio Segment [Member]
Balance				$ 3,111						2,570	3,111		2,570
Provision for (recovery of) credit losses charged to operations											7,262		2,131
Charge-offs											(6,743)		(3,025)
Recoveries											782		833
Net (charge-offs) recoveries											(5,961)		(2,192)
Balance	$ 4,412					$ 3,111					$ 4,412		3,111		2,570
Consumer and Other Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]
Balance										$ 602			$ 602
Balance															$ 602
[1] Derived from audited financial statements

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- Definition

Amount, after recovery, of writeoff of financing receivable, charged against allowance for credit loss.

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