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Note 5 - Allowance for Loan Losses - Changes in Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Beginning balance	$ 26,182	$ 18,425
Provision for (recovery of) loan losses charged to operations	(4,001)	3,500
Charge-offs	(1,730)	(1,194)
Recoveries	1,005	406
Net charge-offs	(725)	(788)
Ending balance	34,563	21,137
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]
Beginning balance	13,107
Commercial Portfolio Segment [Member]
Beginning balance	14,661	10,235
Provision for (recovery of) loan losses charged to operations	(3,070)	1,987
Charge-offs	(757)	(268)
Recoveries	392	121
Net charge-offs	(365)	(147)
Ending balance	19,586	12,075
Commercial Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]
Beginning balance	8,360
Consumer Real Estate Portfolio Segment [Member]
Beginning balance	8,951	6,325
Provision for (recovery of) loan losses charged to operations	(1,542)	1,145
Charge-offs	(10)	(63)
Recoveries	343	112
Net charge-offs	333	49
Ending balance	11,887	7,519
Consumer Real Estate Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]
Beginning balance	4,145
Consumer and Other Portfolio Segment [Member]
Beginning balance	2,570	1,865
Provision for (recovery of) loan losses charged to operations	611	368
Charge-offs	(963)	(863)
Recoveries	270	173
Net charge-offs	(693)	(690)
Ending balance	3,090	$ 1,543
Consumer and Other Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]
Beginning balance	$ 602

X

- Definition

Amount, after recovery, of writeoff of financing receivable, charged against allowance for credit loss, or the excess of the recovery over the writeoff.

+ References

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Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

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