Note 20 - Concentrations of Credit - (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Loans and Leases Receivable, Net of Deferred Income	$ 4,606,176	$ 3,189,608
Commercial Real Estate Portfolio Segment [Member] | Nonfarm Nonresidential [Member]
Loans and Leases Receivable, Net of Deferred Income	$ 1,826,819	$ 1,144,426
Commercial Real Estate Portfolio Segment [Member] | Nonfarm Nonresidential [Member] | Loan Secured by Real Estate [Member] | Credit Concentration Risk [Member]
Concentration Risk, Percentage	39.70%	35.90%
Commercial Real Estate Portfolio Segment [Member] | Construction and Land [Member]
Loans and Leases Receivable, Net of Deferred Income	$ 722,074	$ 548,528
Commercial Real Estate Portfolio Segment [Member] | Construction and Land [Member] | Loan Secured by Real Estate [Member] | Credit Concentration Risk [Member]
Concentration Risk, Percentage	15.70%	17.20%