Note 3 - Loans and Allowance for Credit Losses on Loans - Loans by Loan Portfolio Class (Details) - USD ($) $ in Thousands		Mar. 31, 2025	Dec. 31, 2024
Loans	[1]	$ 6,646,360	$ 6,520,402
Home Equity Line of Credit [Member]
Loans		252,125	247,433
Credit Card Receivable [Member]
Loans		26,297	24,540
Commercial Real Estate Portfolio Segment [Member]
Loans		2,875,126	2,838,788
Commercial Real Estate Portfolio Segment [Member] | Non-owner Occupied [Member]
Loans		1,870,352	1,835,935
Commercial Real Estate Portfolio Segment [Member] | Owner Occupied [Member]
Loans		1,004,774	1,002,853
Commercial and Industrial Portfolio Segment [Member]
Loans		1,463,746	1,438,654
Commercial and Industrial Portfolio Segment [Member] | Term [Member]
Loans		899,813	884,399
Commercial and Industrial Portfolio Segment [Member] | Lines of Credit [Member]
Loans		563,933	554,255
Residential Real Estate Portfolio Segment [Member]
Loans		1,195,252	1,187,824
Residential Real Estate Portfolio Segment [Member] | Non-owner Occupied [Member]
Loans		381,429	382,744
Residential Real Estate Portfolio Segment [Member] | Owner Occupied [Member]
Loans		813,823	805,080
Construction and Development [Member]
Loans		679,345	623,005
Consumer Portfolio Segment [Member]
Loans		140,009	144,644
Finance Leases Portfolio Segment [Member]
Loans		$ 14,460	$ 15,514

[1] (1) Total loans are presented inclusive of premiums, discounts and net loan origination fees and costs.