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Note 1 - Nature of Business and Significant Accounting Policies (Details)		1 Months Ended		12 Months Ended
	Nov. 30, 2021 USD ($)	Nov. 30, 2021 USD ($)	Nov. 30, 2020 USD ($)	Dec. 31, 2021 USD ($) subsidiary segment shares	Dec. 31, 2020 USD ($) shares	Dec. 31, 2019 USD ($) shares	Jan. 01, 2021 USD ($)	Dec. 31, 2018 USD ($)
Retained earnings				$ 386,077,000	$ 300,804,000
Less allowance				78,721,000	$ 84,376,000	$ 36,001,000	$ 84,376,000	$ 39,847,000
Debt Securities, Held-to-maturity, Allowance for Credit Loss				$ 198,000
Number of subsidiaries commercial banks \| subsidiary				4
Number of portfolio segments \| segment				8
Financing Receivable, Lines of Credit Maximum Term				1 year
Number of Non-Consolidated Subsidiaries Issuing Trust Preferred Securities \| subsidiary				6
Cash Reserve Deposit Required and Made				$ 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number \| shares				318,266	354,899	365,084
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value				$ 11,600,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value				10,800,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value				419,000	$ 270,000	$ 303,000
Allocated Share-based Compensation Expense				2,352,000	2,150,000	2,469,000
Goodwill impairment	$ 0	$ 0	$ 0		500,000	3,000,000
Minimum outstanding balance considered for calculation of low quality loans allowance on case-to-case basis				250,000
Maximum principal balance considered for placing low quality loans in the unique pool				250,000
Other Assets
Accrued investment income receivable				15,000,000
Subsidiary banks with an asset size of $1.0 billion or less
Lending Threshold Requiring Additional Loan Review				1,000,000
Subsidiary banks with an asset size of over $1.0 billion
Lending Threshold Requiring Additional Loan Review				2,000,000.0
Cumulative Effect, Period of Adoption, Adjustment [Member]
Less allowance							(8,102,000)
Debt Securities, Held-to-maturity, Allowance for Credit Loss							183,000
Off-Balance Sheet, Credit Loss, Liability							9,117,000
Accounting Standards Update 2016-13
Less allowance				(8,102,000)
Debt Securities, Held-to-maturity, Allowance for Credit Loss				183,000
Accounting Standards Update 2016-13 \| Cumulative Effect, Period of Adoption, Adjustment [Member]
Retained earnings							937,000
Less allowance							8,100,000
Debt Securities, Held-to-maturity, Allowance for Credit Loss							183,000
Off-Balance Sheet, Credit Loss, Liability							9,100,000
Employee Stock Option
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized				$ 382,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition				1 year 11 months 23 days
Allocated Share-based Compensation Expense				$ 270,000	297,000	475,000
In The Money Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number \| shares				367,998
Restricted Stock
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized				$ 2,700,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition				1 year 8 months 12 days
Allocated Share-based Compensation Expense				$ 1,864,000	1,619,000	1,850,000
Subsidiaries [Member] \| Fixed Rate Residential Mortgage [Member]
Financing receivable, term				15 years
Commercial Portfolio Segment [Member]
Less allowance				$ 29,889,000	$ 35,421,000	$ 16,072,000	35,421,000	$ 16,420,000
Financing Receivable, Term Loans, Generally Maximum Term				7 years
Commercial Portfolio Segment [Member] \| Cumulative Effect, Period of Adoption, Adjustment [Member]
Less allowance							$ (35,421,000)
Commercial Portfolio Segment [Member] \| Accounting Standards Update 2016-13
Less allowance				$ (35,421,000)
Minimum
Financing Receivable, Lines of Credit Maximum Term				6 months
Residual Value Percent of Cost				3.00%
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
Permanent loans term				20 years
Financing Receivable, Credit Weaknesses Borrowers, Term				365 days
Financing Receivable, Lines of Credit Maximum Term				1 year
Residual Value Percent of Cost				25.00%
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