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Note 1 - Nature of Business and Significant Accounting Policies (Details)		1 Months Ended		3 Months Ended	12 Months Ended
	Nov. 30, 2020 USD ($)	Nov. 30, 2020 USD ($)	Nov. 30, 2019 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2020 USD ($) subsidiary shares	Dec. 31, 2019 USD ($) shares	Dec. 31, 2018 USD ($) shares	Dec. 31, 2017 USD ($)
Number of subsidiaries commercial banks \| subsidiary					4
Number of Non-Consolidated Subsidiaries Issuing Trust Preferred Securities \| subsidiary					6
Cash Reserve Deposit Required and Made					$ 0	$ 38,060,000
Initial Direct Leasing Costs As a Percentage of Cost					5.50%
Financing Receivable, Lines of Credit Maximum Term					1 year
Commercial Real Estate Owner Occupied, Percentage					26.00%	26.00%
Lending Threshold Requiring Additional Loan Review					$ 1,000,000
Goodwill impairment	$ 0	$ 0			$ 500,000	$ 3,000,000
Goodwill, Impaired, Accumulated Impairment Loss							$ 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number \| shares					354,899	365,084	358,270
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value					$ 7,300,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value					7,300,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value					$ 270,000	$ 303,000	$ 365,000
Preferred stock, authorized (in shares) \| shares					250,000	250,000
Preferred stock, outstanding (in shares) \| shares					0	0
Common stock, outstanding (in shares) \| shares					15,805,711	15,828,098
Allocated Share-based Compensation Expense					$ 2,150,000	$ 2,469,000	1,443,000
Retained earnings					300,804,000	245,836,000
Less allowance					$ 84,376,000	$ 36,001,000	39,847,000	$ 34,356,000
Accounting Standards Update 2016-02 [Member]
Initial Direct Leasing Costs As a Percentage of Cost					3.20%	3.90%
Employee Stock Option
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized					$ 399,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition					1 year 7 months 2 days
Allocated Share-based Compensation Expense					$ 297,000	$ 475,000	472,000
In The Money Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number \| shares					329,736
Restricted Stock
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized					$ 2,800,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition					1 year 10 months 24 days
Allocated Share-based Compensation Expense					$ 1,619,000	1,850,000	857,000
Bates Companies
Goodwill impairment			$ 3,000,000	$ 500,000	500,000	3,000,000
Goodwill, Impaired, Accumulated Impairment Loss					$ 3,000,000
Subsidiaries [Member] \| Fixed Rate Residential Mortgage [Member]
Financing Receivable, Term					15 years
Construction Loans [Member]
Loan and Leases Receivable, Lending Limits Percent					100.00%
Commercial Portfolio Segment [Member]
Financing Receivable, Term Loans, Generally Maximum Term					7 years
Less allowance					$ 35,421,000	16,072,000	16,420,000	14,323,000
Commercial Portfolio Segment [Member] \| Other Non-owner Occupied Commercial Real Estate Loans [Member]
Loan and Leases Receivable, Lending Limits Percent					300.00%
Commercial Real Estate Portfolio Segment [Member]
Less allowance					$ 42,161,000	$ 15,379,000	$ 17,719,000	$ 13,963,000
Minimum
Residual Value Percent of Cost					3.00%
Financing Receivable, Lines of Credit Maximum Term					6 months
Loan or lease portfolio, exposure to risk					$ 250,000
Minimum \| Subsidiaries [Member] \| Adjustable Rate Residential Mortgage [Member]
Financing Receivable, Term					1 year
Minimum \| Commercial Portfolio Segment [Member] \| Term Loan [Member]
Financing Receivable, Term					3 years
Maximum
Residual Value Percent of Cost					25.00%
Financing Receivable, Lines of Credit Maximum Term					1 year
Financing Receivable, Credit Weaknesses Borrowers, Term					365 days
Permanent loans term					20 years
Maximum \| Subsidiaries [Member] \| Adjustable Rate Residential Mortgage [Member]
Financing Receivable, Term					5 years
Maximum \| Commercial Portfolio Segment [Member] \| Term Loan [Member]
Financing Receivable, Term					5 years
Core Deposits [Member]
Estimated useful life					10 years
Customer Lists [Member]
Estimated useful life					15 years