Note 4 - Loans and Allowance for Credit Losses - Schedule of Total Loans Outstanding by Portfolio Segment (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	$ 4,102,075	$ 3,992,534
Commercial Borrower [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	2,856,720	2,787,277
Consumer Borrower [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss		1,205,257
Commercial Portfolio Segment [Member] | Commercial Borrower [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	702,135	666,727
Commercial Real Estate Portfolio Segment [Member] | Commercial Borrower [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	2,025,634	1,996,243
Commercial Real Estate Portfolio Segment [Member] | Commercial Borrower [Member] | Construction, Land, and Development [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	349,768	294,677
Commercial Real Estate Portfolio Segment [Member] | Commercial Borrower [Member] | Multifamily Loan [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	374,761	363,123
Commercial Real Estate Portfolio Segment [Member] | Commercial Borrower [Member] | Non-Owner Occupied [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	865,785	967,025
Commercial Real Estate Portfolio Segment [Member] | Commercial Borrower [Member] | Owner Occupied Loans [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	435,320	371,418
Agricultural Real Estate Portfolio Segment [Member] | Commercial Borrower [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	128,951	124,307
Agricultural Real Estate Portfolio Segment [Member] | Commercial Borrower [Member] | Land [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	65,900	61,299
Agricultural Real Estate Portfolio Segment [Member] | Commercial Borrower [Member] | Production Loans [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	63,051	63,008
Residential Portfolio Segment [Member] | Consumer Borrower [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	1,203,641	1,161,135
Residential Portfolio Segment [Member] | Consumer Borrower [Member] | Real Estate, First Lien [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	894,402	921,019
Residential Portfolio Segment [Member] | Consumer Borrower [Member] | Construction Loans [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	34,124	33,547
Residential Portfolio Segment [Member] | Consumer Borrower [Member] | Home Equity Loan [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	234,681	162,509
Residential Portfolio Segment [Member] | Consumer Borrower [Member] | Real Estate, Junior Lien [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	40,434	44,060
Consumer Portfolio Segment [Member] | Consumer Borrower [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	1,245,355	1,205,257
Consumer Portfolio Segment [Member] | Consumer Borrower [Member] | Consumer, Other [Member]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss	$ 41,714	$ 44,122