Note 3 - Loans and Allowance for Credit Losses - Components of Loan Portfolio (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2024	Dec. 31, 2023
Loans	$ 4,438,245	$ 4,303,758
Percent of portfolio	100.00%	100.00%
Period increase (decrease)	3.10%
Commercial Portfolio Segment [Member]
Loans	$ 3,533,279	$ 3,415,299
Percent of portfolio	79.70%	79.40%
Period increase (decrease)	3.50%
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]
Loans	$ 1,275,745	$ 1,254,586
Percent of portfolio	28.80%	29.20%
Period increase (decrease)	1.70%
Commercial Portfolio Segment [Member] | Vacant Land and Land Development and Residential Construction Loan [Member]
Loans	$ 76,247	$ 74,753
Percent of portfolio	1.70%	1.70%
Period increase (decrease)	2.00%
Commercial Portfolio Segment [Member] | Real Estate Owner Occupied Loan [Member]
Loans	$ 732,844	$ 717,667
Percent of portfolio	16.50%	16.70%
Period increase (decrease)	2.10%
Commercial Portfolio Segment [Member] | Real Estate Non Owner Occupied Loan [Member]
Loans	$ 1,059,053	$ 1,035,684
Percent of portfolio	23.90%	24.10%
Period increase (decrease)	2.30%
Commercial Portfolio Segment [Member] | Real Estate Multi Family and Residential Rental Loan [Member]
Loans	$ 389,390	$ 332,609
Percent of portfolio	8.80%	7.70%
Period increase (decrease)	17.10%
Retail Portfolio Segment [Member]
Loans	$ 904,966	$ 888,459
Percent of portfolio	20.30%	20.60%
Period increase (decrease)	1.90%
Retail Portfolio Segment [Member] | One to Four Family Mortgages [Member]
Loans	$ 849,625	$ 837,406
Percent of portfolio	19.10%	19.50%
Period increase (decrease)	1.50%
Retail Portfolio Segment [Member] | Other Consumer Loans [Member]
Loans	$ 55,341	$ 51,053
Percent of portfolio	1.20%	1.10%
Period increase (decrease)	8.40%