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Note 20 - Concentrations of Credit - (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Loans and Leases Receivable, Net of Deferred Income, Total	$ 3,189,608	$ 2,991,355
Commercial Real Estate Portfolio Segment [Member] \| Nonfarm Nonresidential [Member]
Loans and Leases Receivable, Net of Deferred Income, Total	$ 1,144,426	$ 971,603
Commercial Real Estate Portfolio Segment [Member] \| Nonfarm Nonresidential [Member] \| Loan Secured by Real Estate [Member] \| Credit Concentration Risk [Member]
Concentration Risk, Percentage	35.90%	32.50%
Commercial Real Estate Portfolio Segment [Member] \| Construction and Land [Member]
Loans and Leases Receivable, Net of Deferred Income, Total	$ 548,528	$ 403,065
Commercial Real Estate Portfolio Segment [Member] \| Construction and Land [Member] \| Loan Secured by Real Estate [Member] \| Credit Concentration Risk [Member]
Concentration Risk, Percentage	17.20%	13.50%