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Note 5 - Allowance for Credit Losses - Changes in Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022		Jun. 30, 2021
Balance	$ 28,981	$ 34,563	$ 27,858	[1]	$ 26,182
Provision for (recovery of) credit losses	510	(2,230)	2,471		(6,231)
Charge-offs	(1,469)	(1,902)	(2,771)		(3,632)
Recoveries	1,727	1,426	2,191		2,431
Net recoveries (charge-offs)	258	(476)	(580)		(1,201)
Balance	29,749	31,857	29,749		31,857
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]
Balance					13,107
Commercial Portfolio Segment [Member]
Balance	15,896	19,586	14,775		14,661
Provision for (recovery of) credit losses	(808)	(1,712)	300		(4,782)
Charge-offs	(151)	(1,202)	(408)		(1,959)
Recoveries	1,182	1,032	1,452		1,424
Net recoveries (charge-offs)	1,031	(170)	1,044		(535)
Balance	16,119	17,704	16,119		17,704
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	9,764	11,887	9,972		8,951
Provision for (recovery of) credit losses	48	(986)	(193)		(2,528)
Charge-offs	(88)	(48)	(94)		(58)
Recoveries	325	202	364		545
Net recoveries (charge-offs)	237	154	270		487
Balance	10,049	11,055	10,049		11,055
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	3,321	3,090	3,111		2,570
Provision for (recovery of) credit losses	1,270	468	2,364		1,079
Charge-offs	(1,230)	(652)	(2,269)		(1,615)
Recoveries	220	192	375		462
Net recoveries (charge-offs)	(1,010)	(460)	(1,894)		(1,153)
Balance	$ 3,581	$ 3,098	$ 3,581		3,098
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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