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Note 6 - Allowance for Credit Losses - Changes in Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022		Sep. 30, 2021
Balance	$ 29,749	$ 31,857	$ 27,858	[1]	$ 26,182
Provision for (recovery of) credit losses	685	(1,394)	3,156		(7,625)
Charge-offs	(2,158)	(1,255)	(4,929)		(4,887)
Recoveries	1,112	669	3,303		3,100
Net recoveries (charge-offs)	(1,046)	(586)	(1,626)		(1,787)
Balance	29,388	29,877	29,388		29,877
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]
Balance					13,107
Commercial Portfolio Segment [Member]
Balance	16,119	17,704	14,775		14,661
Provision for (recovery of) credit losses	(444)	(1,504)	(144)		(6,286)
Charge-offs	(89)	(407)	(497)		(2,366)
Recoveries	872	285	2,324		1,709
Net recoveries (charge-offs)	783	(122)	1,827		(657)
Balance	16,458	16,078	16,458		16,078
Commercial Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]
Balance					8,360
Consumer Real Estate Portfolio Segment [Member]
Balance	10,049	11,055	9,972		8,951
Provision for (recovery of) credit losses	(1,391)	(317)	(1,584)		(2,845)
Charge-offs	(182)	(195)	(276)		(253)
Recoveries	77	179	441		724
Net recoveries (charge-offs)	(105)	(16)	165		471
Balance	8,553	10,722	8,553		10,722
Consumer Real Estate Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]
Balance					4,145
Consumer and Other Portfolio Segment [Member]
Balance	3,581	3,098	3,111		2,570
Provision for (recovery of) credit losses	2,520	427	4,884		1,506
Charge-offs	(1,887)	(653)	(4,156)		(2,268)
Recoveries	163	205	538		667
Net recoveries (charge-offs)	(1,724)	(448)	(3,618)		(1,601)
Balance	$ 4,377	$ 3,077	$ 4,377		3,077
Consumer and Other Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]
Balance					$ 602
[1] Derived from audited financial statements

X

- Definition

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

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