Note 3 - Loans and Allowance for Credit Losses - Components of Loan Portfolio (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Dec. 31, 2024
Loans	$ 4,636,549	$ 4,600,781
Percent of portfolio	100.00%	100.00%
Period increase (decrease)	0.80%
Commercial Portfolio Segment [Member]
Loans	$ 3,751,591	$ 3,707,304
Percent of portfolio	80.80%	80.60%
Period increase (decrease)	1.20%
Commercial Portfolio Segment [Member] \| Commercial and Industrial [Member]
Loans	$ 1,314,383	$ 1,287,308
Percent of portfolio	28.30%	28.00%
Period increase (decrease)	2.10%
Commercial Portfolio Segment [Member] \| Vacant Land and Land Development and Residential Construction Loan [Member]
Loans	$ 68,790	$ 66,936
Percent of portfolio	1.50%	1.50%
Period increase (decrease)	2.80%
Commercial Portfolio Segment [Member] \| Real Estate Owner Occupied Loan [Member]
Loans	$ 705,645	$ 748,837
Percent of portfolio	15.20%	16.30%
Period increase (decrease)	(5.80%)
Commercial Portfolio Segment [Member] \| Real Estate Non Owner Occupied Loan [Member]
Loans	$ 1,183,728	$ 1,128,404
Percent of portfolio	25.50%	24.50%
Period increase (decrease)	4.90%
Commercial Portfolio Segment [Member] \| Real Estate Multi Family and Residential Rental Loan [Member]
Loans	$ 479,045	$ 475,819
Percent of portfolio	10.30%	10.30%
Period increase (decrease)	0.70%
Retail Portfolio Segment [Member]
Loans	$ 884,958	$ 893,477
Percent of portfolio	19.20%	19.40%
Period increase (decrease)	(1.00%)
Retail Portfolio Segment [Member] \| One to Four Family Mortgages [Member]
Loans	$ 817,212	$ 827,597
Percent of portfolio	17.60%	18.00%
Period increase (decrease)	(1.30%)
Retail Portfolio Segment [Member] \| Other Consumer Loans [Member]
Loans	$ 67,746	$ 65,880
Percent of portfolio	1.60%	1.40%
Period increase (decrease)	2.80%