Note 3 - Loans and Allowance for Credit Losses - Components of Loan Portfolio (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2026	Dec. 31, 2025
Loans	$ 4,952,942	$ 4,821,888
Percent of portfolio	100.00%	100.00%
Period increase (decrease)	2.70%
Commercial Portfolio Segment [Member]
Loans	$ 4,070,778	$ 3,918,662
Percent of portfolio	82.20%	81.30%
Period increase (decrease)	3.90%
Commercial Portfolio Segment [Member] \| Commercial and Industrial [Member]
Loans	$ 1,499,086	$ 1,374,522
Percent of portfolio	30.30%	28.50%
Period increase (decrease)	9.10%
Commercial Portfolio Segment [Member] \| Vacant Land and Land Development and Residential Construction Loan [Member]
Loans	$ 112,646	$ 117,373
Percent of portfolio	2.30%	2.40%
Period increase (decrease)	(4.00%)
Commercial Portfolio Segment [Member] \| Real Estate Owner Occupied Loan [Member]
Loans	$ 757,329	$ 778,869
Percent of portfolio	15.30%	16.20%
Period increase (decrease)	(2.80%)
Commercial Portfolio Segment [Member] \| Real Estate Non Owner Occupied Loan [Member]
Loans	$ 1,159,659	$ 1,110,674
Percent of portfolio	23.40%	23.00%
Period increase (decrease)	4.40%
Commercial Portfolio Segment [Member] \| Real Estate Multi Family and Residential Rental Loan [Member]
Loans	$ 542,058	$ 537,224
Percent of portfolio	10.90%	11.20%
Period increase (decrease)	0.90%
Retail Portfolio Segment [Member]
Loans	$ 882,164	$ 903,226
Percent of portfolio	17.80%	18.70%
Period increase (decrease)	(2.30%)
Retail Portfolio Segment [Member] \| One to Four Family Mortgages [Member]
Loans	$ 763,715	$ 790,857
Percent of portfolio	15.40%	16.40%
Period increase (decrease)	(3.40%)
Retail Portfolio Segment [Member] \| Other Consumer Loans [Member]
Loans	$ 118,449	$ 112,369
Percent of portfolio	2.40%	2.30%
Period increase (decrease)	5.40%