Note 2 - Loans and Allowance for Loan Losses (Details Textual)	3 Months Ended
Mar. 31, 2021 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2020 USD ($)
Loans and Leases Receivable, Gross, Total	$ 2,344,505,000	$ 2,169,687,000	$ 2,330,600,000
Loans and Leases Receivable, Nonperforming, Nonaccrual of Interest	$ 1,300,000		1,300,000
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts	0	1
Financing Receivable, Troubled Debt Restructuring, Subsequent Default		$ 311,000
Financing Receivable, Number of Payment Deferrals	11
Financing Receivable, Deferred Payments	$ 51,400,000
Mortgage Loans in Process of Foreclosure, Amount	578,000		301,000
Potential Problem Loans	8,000,000.0		8,200,000
Real Estate Portfolio Segment [Member]
Loans and Leases Receivable, Gross, Total	2,096,903,000		2,076,783,000
Commercial Portfolio Segment [Member]
Loans and Leases Receivable, Gross, Total	170,712,000	$ 95,547,000	172,811,000
Commercial Portfolio Segment [Member] \| SBA CARES Act Paycheck Protection Program [Member]
Loans and Leases Receivable, Gross, Total	67,200,000		62,400,000
Consumer Portfolio Segment [Member]
Loans and Leases Receivable, Gross, Total	$ 66,724,000		$ 70,517,000
Minimum [Member] \| Real Estate Portfolio Segment [Member]
Financing Receivable, Amortization Period (Year)	15 years
Financing Receivable, Maturity Period (Year)	5 years
Minimum [Member] \| Consumer Portfolio Segment [Member]
Financing Receivable, Maturity Period (Year)	1 year
Maximum [Member] \| Real Estate Portfolio Segment [Member]
Financing Receivable, Amortization Period (Year)	30 years
Financing Receivable, Maturity Period (Year)	15 years
Maximum [Member] \| Consumer Portfolio Segment [Member]
Financing Receivable, Maturity Period (Year)	5 years

Number of financing receivable contracts modified as troubled debt restructuring within previous 12 months, with subsequent payment default.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 34
-URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953682-111524

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Amount of financing receivable modified as troubled debt restructuring within previous 12 months, with subsequent payment default.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 34
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953682-111524

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Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=121593590&loc=d3e4428-111522

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Reflects the carrying amount of loans deemed to be questionable as to collection on which no interest is continuing to be recognized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5111-111524

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Recorded investment of consumer mortgage loan receivables secured by residential real estate properties for which formal foreclosure proceedings are in process.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-Topic 310
-SubTopic 10
-Section 50
-Paragraph 35
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The amortization period of financing receivables.

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Deferred amounts on loans receivable related to loan modification programs offered to financial institution customers affected by COVID-19.

+ References

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The maturity period for financing receivables.

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Number of payment deferrals on loans receivable related to loan modification programs offered to financial institution customers affected by COVID-19.

+ References

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- Definition

Loans where the borrowers have experienced financial difficulty and the Company has identified as a potential future loss. Additional monitoring is administered to these loans.

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