Note 1 - Nature of Business and Significant Accounting Policies - Impact of ASU 2016-13 (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Jan. 01, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Debt Securities, Held-to-maturity, Allowance for Credit Loss	$ 198
Less allowance for estimated losses on loans/leases	78,721	$ 84,376	$ 84,376	$ 36,001	$ 39,847
Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Debt Securities, Held-to-maturity, Allowance for Credit Loss		183
Less allowance for estimated losses on loans/leases		76,274
Off-Balance Sheet, Credit Loss, Liability		9,117
Cumulative Effect, Period of Adoption, Adjustment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Debt Securities, Held-to-maturity, Allowance for Credit Loss		183
Less allowance for estimated losses on loans/leases		(8,102)
Off-Balance Sheet, Credit Loss, Liability		9,117
Commercial Portfolio Segment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Less allowance for estimated losses on loans/leases	29,889	35,421	35,421	16,072	16,420
Commercial Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Less allowance for estimated losses on loans/leases		(35,421)
Commercial Real Estate Portfolio Segment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Less allowance for estimated losses on loans/leases		42,161	42,161	15,379	17,719
Commercial Real Estate Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Less allowance for estimated losses on loans/leases		(42,161)
Construction and Land Development [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Less allowance for estimated losses on loans/leases	16,972
Multi-family
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Less allowance for estimated losses on loans/leases	9,339
Multi-family | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Less allowance for estimated losses on loans/leases		5,836
Multi-family | Cumulative Effect, Period of Adoption, Adjustment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Less allowance for estimated losses on loans/leases		5,836
Direct financing leases
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Less allowance for estimated losses on loans/leases	1,546	1,764	1,764	1,464	1,792
Direct financing leases | Cumulative Effect, Period of Adoption, Adjustment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Less allowance for estimated losses on loans/leases		(1,764)
1-4 family real estate
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Less allowance for estimated losses on loans/leases	4,541
1-4 family real estate | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Less allowance for estimated losses on loans/leases		5,042
1-4 family real estate | Cumulative Effect, Period of Adoption, Adjustment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Less allowance for estimated losses on loans/leases		5,042
Residential real estate
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Less allowance for estimated losses on loans/leases		3,732	3,732	1,948	2,557
Residential real estate | Cumulative Effect, Period of Adoption, Adjustment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Less allowance for estimated losses on loans/leases		(3,732)
Consumer
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Less allowance for estimated losses on loans/leases	930	1,298	1,298
Consumer | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Less allowance for estimated losses on loans/leases		1,161
Consumer | Cumulative Effect, Period of Adoption, Adjustment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Less allowance for estimated losses on loans/leases		(137)
Installment and other consumer loans
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Less allowance for estimated losses on loans/leases			$ 1,298	$ 1,138	$ 1,359
C&I - revolving | Commercial Portfolio Segment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Less allowance for estimated losses on loans/leases	3,907
C&I - revolving | Commercial Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Less allowance for estimated losses on loans/leases		2,982
C&I - revolving | Commercial Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Less allowance for estimated losses on loans/leases		2,982
C&I - revolving | Commercial Real Estate Portfolio Segment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Less allowance for estimated losses on loans/leases	3,907
C&I - other | Commercial Portfolio Segment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Less allowance for estimated losses on loans/leases	25,982
C&I - other | Commercial Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Less allowance for estimated losses on loans/leases		29,130
C&I - other | Commercial Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Less allowance for estimated losses on loans/leases		29,130
C&I - other | Direct financing leases
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Less allowance for estimated losses on loans/leases	1,780
CRE - owner occupied | Commercial Real Estate Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Less allowance for estimated losses on loans/leases		8,696
CRE - owner occupied | Commercial Real Estate Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Less allowance for estimated losses on loans/leases		8,696
CRE - non owner occupied
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Less allowance for estimated losses on loans/leases	8,549
CRE - non owner occupied | Commercial Real Estate Portfolio Segment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Less allowance for estimated losses on loans/leases	$ 8,549
CRE - non owner occupied | Commercial Real Estate Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Less allowance for estimated losses on loans/leases		11,428
CRE - non owner occupied | Commercial Real Estate Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Less allowance for estimated losses on loans/leases		11,428
Construction Loans [Member] | Construction and Land Development [Member] | Cumulative Effect, Period of Adoption, Adjusted Balance [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Less allowance for estimated losses on loans/leases		11,999
Construction Loans [Member] | Construction and Land Development [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Less allowance for estimated losses on loans/leases		$ 11,999