Note 4 - Loans and Allowance for Credit Losses - Schedule of Nonaccrual Loans by Class (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Financing Receivable, Excluding Accrued Interest, Nonaccrual, No Allowance	$ 40,217	$ 45,764
Financing Receivable, Excluding Accrued Interest, Nonaccrual	59,644	54,433
Financing Receivable, Excluding Accrued Interest, 90 Days or More Past Due, Still Accruing	0	8,453
Commercial Borrower [Member]
Financing Receivable, Excluding Accrued Interest, Nonaccrual, No Allowance	29,557	35,774
Financing Receivable, Excluding Accrued Interest, Nonaccrual	48,616	41,757
Financing Receivable, Excluding Accrued Interest, 90 Days or More Past Due, Still Accruing	0	8,400
Commercial Borrower [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Excluding Accrued Interest, Nonaccrual, No Allowance	0	2,952
Financing Receivable, Excluding Accrued Interest, Nonaccrual	12,190	3,218
Financing Receivable, Excluding Accrued Interest, 90 Days or More Past Due, Still Accruing	0	8,400
Commercial Borrower [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable, Excluding Accrued Interest, Nonaccrual, No Allowance	28,317	31,561
Financing Receivable, Excluding Accrued Interest, Nonaccrual	35,186	37,278
Financing Receivable, Excluding Accrued Interest, 90 Days or More Past Due, Still Accruing	0	0
Commercial Borrower [Member] | Commercial Real Estate Portfolio Segment [Member] | Construction, Land, and Development [Member]
Financing Receivable, Excluding Accrued Interest, Nonaccrual, No Allowance	24,576	24,638
Financing Receivable, Excluding Accrued Interest, Nonaccrual	31,315	30,044
Financing Receivable, Excluding Accrued Interest, 90 Days or More Past Due, Still Accruing	0	0
Commercial Borrower [Member] | Commercial Real Estate Portfolio Segment [Member] | Multifamily Loan [Member]
Financing Receivable, Excluding Accrued Interest, Nonaccrual, No Allowance	761	0
Financing Receivable, Excluding Accrued Interest, Nonaccrual	761	0
Financing Receivable, Excluding Accrued Interest, 90 Days or More Past Due, Still Accruing	0	0
Commercial Borrower [Member] | Commercial Real Estate Portfolio Segment [Member] | Non-Owner Occupied [Member]
Financing Receivable, Excluding Accrued Interest, Nonaccrual, No Allowance	1,693	5,217
Financing Receivable, Excluding Accrued Interest, Nonaccrual	1,693	5,217
Financing Receivable, Excluding Accrued Interest, 90 Days or More Past Due, Still Accruing	0	0
Commercial Borrower [Member] | Commercial Real Estate Portfolio Segment [Member] | Owner Occupied Loans [Member]
Financing Receivable, Excluding Accrued Interest, Nonaccrual, No Allowance	1,287	1,706
Financing Receivable, Excluding Accrued Interest, Nonaccrual	1,417	2,017
Financing Receivable, Excluding Accrued Interest, 90 Days or More Past Due, Still Accruing	0	0
Commercial Borrower [Member] | Agricultural Real Estate Portfolio Segment [Member]
Financing Receivable, Excluding Accrued Interest, Nonaccrual, No Allowance	1,240	1,261
Financing Receivable, Excluding Accrued Interest, Nonaccrual	1,240	1,261
Financing Receivable, Excluding Accrued Interest, 90 Days or More Past Due, Still Accruing	0	0
Commercial Borrower [Member] | Agricultural Real Estate Portfolio Segment [Member] | Land [Member]
Financing Receivable, Excluding Accrued Interest, Nonaccrual, No Allowance	702	609
Financing Receivable, Excluding Accrued Interest, Nonaccrual	702	609
Financing Receivable, Excluding Accrued Interest, 90 Days or More Past Due, Still Accruing	0	0
Commercial Borrower [Member] | Agricultural Real Estate Portfolio Segment [Member] | Production Loans [Member]
Financing Receivable, Excluding Accrued Interest, Nonaccrual, No Allowance	538	652
Financing Receivable, Excluding Accrued Interest, Nonaccrual	538	652
Financing Receivable, Excluding Accrued Interest, 90 Days or More Past Due, Still Accruing	0	0
Consumer Borrower [Member] | Residential Portfolio Segment [Member]
Financing Receivable, Excluding Accrued Interest, Nonaccrual, No Allowance	10,660	9,990
Financing Receivable, Excluding Accrued Interest, Nonaccrual	10,971	12,338
Financing Receivable, Excluding Accrued Interest, 90 Days or More Past Due, Still Accruing	0	53
Consumer Borrower [Member] | Residential Portfolio Segment [Member] | Real Estate, First Lien [Member]
Financing Receivable, Excluding Accrued Interest, Nonaccrual, No Allowance	2,575	2,614
Financing Receivable, Excluding Accrued Interest, Nonaccrual	2,687	2,988
Financing Receivable, Excluding Accrued Interest, 90 Days or More Past Due, Still Accruing	0	53
Consumer Borrower [Member] | Residential Portfolio Segment [Member] | Construction Loans [Member]
Financing Receivable, Excluding Accrued Interest, Nonaccrual, No Allowance	4,680	4,680
Financing Receivable, Excluding Accrued Interest, Nonaccrual	4,680	4,680
Financing Receivable, Excluding Accrued Interest, 90 Days or More Past Due, Still Accruing	0	0
Consumer Borrower [Member] | Residential Portfolio Segment [Member] | Home Equity Loan [Member]
Financing Receivable, Excluding Accrued Interest, Nonaccrual, No Allowance	1,100	0
Financing Receivable, Excluding Accrued Interest, Nonaccrual	1,213	1,460
Financing Receivable, Excluding Accrued Interest, 90 Days or More Past Due, Still Accruing	0	0
Consumer Borrower [Member] | Residential Portfolio Segment [Member] | Real Estate, Junior Lien [Member]
Financing Receivable, Excluding Accrued Interest, Nonaccrual, No Allowance	2,305	2,696
Financing Receivable, Excluding Accrued Interest, Nonaccrual	2,391	3,210
Financing Receivable, Excluding Accrued Interest, 90 Days or More Past Due, Still Accruing	0	0
Consumer Borrower [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Excluding Accrued Interest, Nonaccrual, No Allowance	10,660	9,990
Financing Receivable, Excluding Accrued Interest, Nonaccrual	11,028	12,676
Financing Receivable, Excluding Accrued Interest, 90 Days or More Past Due, Still Accruing	0	53
Consumer Borrower [Member] | Consumer Portfolio Segment [Member] | Consumer, Other [Member]
Financing Receivable, Excluding Accrued Interest, Nonaccrual, No Allowance	0	0
Financing Receivable, Excluding Accrued Interest, Nonaccrual	57	338
Financing Receivable, Excluding Accrued Interest, 90 Days or More Past Due, Still Accruing	$ 0	$ 0