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Note 4 - Loans and Allowance for Credit Losses - Summary of Collateral Types (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Jun. 30, 2025
Dec. 31, 2024
Sep. 30, 2024
Jun. 30, 2024
Dec. 31, 2023
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss $ 4,102,075   $ 3,992,534      
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 62,127 $ 59,278 59,929 $ 39,142 $ 38,332 $ 35,843
Real Estate [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 47,020   52,356      
Equipment [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 0   927      
Collateral, Other [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 0   289      
Collateral Pledged [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 47,020   53,572      
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 4,991   5,636      
Commercial Borrower [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 2,856,720   2,787,277      
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 50,100 49,706 50,130 31,165 30,980 27,971
Commercial Borrower [Member] | Real Estate [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 36,350   40,691      
Commercial Borrower [Member] | Equipment [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 0   927      
Commercial Borrower [Member] | Collateral, Other [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 0   0      
Commercial Borrower [Member] | Collateral Pledged [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 36,350   41,618      
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 4,988   4,997      
Commercial Borrower [Member] | Commercial Portfolio Segment [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 702,135   666,727      
Commercial Borrower [Member] | Commercial Portfolio Segment [Member] | Real Estate [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 0   2,885      
Commercial Borrower [Member] | Commercial Portfolio Segment [Member] | Equipment [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 0   275      
Commercial Borrower [Member] | Commercial Portfolio Segment [Member] | Collateral, Other [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 0   0      
Commercial Borrower [Member] | Commercial Portfolio Segment [Member] | Collateral Pledged [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 0   3,160      
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 0   4      
Commercial Borrower [Member] | Commercial Real Estate Portfolio Segment [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 2,025,634   1,996,243      
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 35,008 40,142 40,732 23,905 24,302 18,086
Commercial Borrower [Member] | Commercial Real Estate Portfolio Segment [Member] | Construction, Land, and Development [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 349,768   294,677      
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 17,257 18,529 16,277 10,373 10,820 6,135
Commercial Borrower [Member] | Commercial Real Estate Portfolio Segment [Member] | Multifamily Loan [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 374,761   363,123      
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 4,337 4,876 4,716 2,591 2,430 1,776
Commercial Borrower [Member] | Commercial Real Estate Portfolio Segment [Member] | Non-Owner Occupied [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 865,785   967,025      
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 10,123 12,919 16,513 8,512 8,772 7,726
Commercial Borrower [Member] | Commercial Real Estate Portfolio Segment [Member] | Owner Occupied Loans [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 435,320   371,418      
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 3,291 3,818 3,226 2,429 2,280 2,449
Commercial Borrower [Member] | Commercial Real Estate Portfolio Segment [Member] | Real Estate [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 35,110   37,197      
Commercial Borrower [Member] | Commercial Real Estate Portfolio Segment [Member] | Real Estate [Member] | Construction, Land, and Development [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 31,315   30,044      
Commercial Borrower [Member] | Commercial Real Estate Portfolio Segment [Member] | Real Estate [Member] | Multifamily Loan [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 761   0      
Commercial Borrower [Member] | Commercial Real Estate Portfolio Segment [Member] | Real Estate [Member] | Non-Owner Occupied [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 1,693   5,217      
Commercial Borrower [Member] | Commercial Real Estate Portfolio Segment [Member] | Real Estate [Member] | Owner Occupied Loans [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 1,341   1,936      
Commercial Borrower [Member] | Commercial Real Estate Portfolio Segment [Member] | Equipment [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 0   0      
Commercial Borrower [Member] | Commercial Real Estate Portfolio Segment [Member] | Equipment [Member] | Construction, Land, and Development [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 0   0      
Commercial Borrower [Member] | Commercial Real Estate Portfolio Segment [Member] | Equipment [Member] | Multifamily Loan [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 0   0      
Commercial Borrower [Member] | Commercial Real Estate Portfolio Segment [Member] | Equipment [Member] | Non-Owner Occupied [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 0   0      
Commercial Borrower [Member] | Commercial Real Estate Portfolio Segment [Member] | Equipment [Member] | Owner Occupied Loans [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 0   0      
Commercial Borrower [Member] | Commercial Real Estate Portfolio Segment [Member] | Collateral, Other [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 0   0      
Commercial Borrower [Member] | Commercial Real Estate Portfolio Segment [Member] | Collateral, Other [Member] | Construction, Land, and Development [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 0   0      
Commercial Borrower [Member] | Commercial Real Estate Portfolio Segment [Member] | Collateral, Other [Member] | Multifamily Loan [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 0   0      
Commercial Borrower [Member] | Commercial Real Estate Portfolio Segment [Member] | Collateral, Other [Member] | Non-Owner Occupied [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 0   0      
Commercial Borrower [Member] | Commercial Real Estate Portfolio Segment [Member] | Collateral, Other [Member] | Owner Occupied Loans [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 0   0      
Commercial Borrower [Member] | Commercial Real Estate Portfolio Segment [Member] | Collateral Pledged [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 35,110   37,197      
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 4,988   4,993      
Commercial Borrower [Member] | Commercial Real Estate Portfolio Segment [Member] | Collateral Pledged [Member] | Construction, Land, and Development [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 31,315   30,044      
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 4,984   4,984      
Commercial Borrower [Member] | Commercial Real Estate Portfolio Segment [Member] | Collateral Pledged [Member] | Multifamily Loan [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 761   0      
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 0   0      
Commercial Borrower [Member] | Commercial Real Estate Portfolio Segment [Member] | Collateral Pledged [Member] | Non-Owner Occupied [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 1,693   5,217      
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 0   0      
Commercial Borrower [Member] | Commercial Real Estate Portfolio Segment [Member] | Collateral Pledged [Member] | Owner Occupied Loans [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 1,341   1,936      
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 4   9      
Commercial Borrower [Member] | Agricultural Real Estate Portfolio Segment [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 128,951   124,307      
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 1,687 1,238 1,228 459 444 180
Commercial Borrower [Member] | Agricultural Real Estate Portfolio Segment [Member] | Land [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 65,900   61,299      
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 999 615 597 277 259 96
Commercial Borrower [Member] | Agricultural Real Estate Portfolio Segment [Member] | Production Loans [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 63,051   63,008      
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 688 623 631 182 185 84
Commercial Borrower [Member] | Agricultural Real Estate Portfolio Segment [Member] | Real Estate [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 1,240   609      
Commercial Borrower [Member] | Agricultural Real Estate Portfolio Segment [Member] | Real Estate [Member] | Land [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 702   609      
Commercial Borrower [Member] | Agricultural Real Estate Portfolio Segment [Member] | Real Estate [Member] | Production Loans [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 538   0      
Commercial Borrower [Member] | Agricultural Real Estate Portfolio Segment [Member] | Equipment [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 0   652      
Commercial Borrower [Member] | Agricultural Real Estate Portfolio Segment [Member] | Equipment [Member] | Land [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 0   0      
Commercial Borrower [Member] | Agricultural Real Estate Portfolio Segment [Member] | Equipment [Member] | Production Loans [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 0   652      
Commercial Borrower [Member] | Agricultural Real Estate Portfolio Segment [Member] | Collateral, Other [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 0   0      
Commercial Borrower [Member] | Agricultural Real Estate Portfolio Segment [Member] | Collateral, Other [Member] | Land [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 0   0      
Commercial Borrower [Member] | Agricultural Real Estate Portfolio Segment [Member] | Collateral, Other [Member] | Production Loans [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 0   0      
Commercial Borrower [Member] | Agricultural Real Estate Portfolio Segment [Member] | Collateral Pledged [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 1,240   1,261      
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 0   0      
Commercial Borrower [Member] | Agricultural Real Estate Portfolio Segment [Member] | Collateral Pledged [Member] | Land [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 702   609      
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 0   0      
Commercial Borrower [Member] | Agricultural Real Estate Portfolio Segment [Member] | Collateral Pledged [Member] | Production Loans [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 538   652      
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 0   0      
Consumer Borrower [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss     1,205,257      
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 12,027 9,572 9,799 7,977 7,352 7,872
Consumer Borrower [Member] | Commercial Portfolio Segment [Member]            
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 13,405 8,326 8,170 6,801 6,234 9,705
Consumer Borrower [Member] | Residential Portfolio Segment [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 1,203,641   1,161,135      
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 11,684 9,209 9,359 7,618 7,024 7,671
Consumer Borrower [Member] | Residential Portfolio Segment [Member] | Real Estate, First Lien [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 894,402   921,019      
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 9,294 7,059 6,921 5,440 5,366 6,087
Consumer Borrower [Member] | Residential Portfolio Segment [Member] | Construction Loans [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 34,124   33,547      
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 272 416 357 103 458 485
Consumer Borrower [Member] | Residential Portfolio Segment [Member] | Home Equity Loan [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 234,681   162,509      
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 1,679 1,358 1,339 954 886 835
Consumer Borrower [Member] | Residential Portfolio Segment [Member] | Real Estate, Junior Lien [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 40,434   44,060      
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 439 376 742 1,121 314 264
Consumer Borrower [Member] | Residential Portfolio Segment [Member] | Real Estate [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 10,670   11,665      
Consumer Borrower [Member] | Residential Portfolio Segment [Member] | Real Estate [Member] | Real Estate, First Lien [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 2,585   2,514      
Consumer Borrower [Member] | Residential Portfolio Segment [Member] | Real Estate [Member] | Construction Loans [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 4,680   4,680      
Consumer Borrower [Member] | Residential Portfolio Segment [Member] | Real Estate [Member] | Home Equity Loan [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 1,100   1,366      
Consumer Borrower [Member] | Residential Portfolio Segment [Member] | Real Estate [Member] | Real Estate, Junior Lien [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 2,305   3,105      
Consumer Borrower [Member] | Residential Portfolio Segment [Member] | Equipment [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 0   0      
Consumer Borrower [Member] | Residential Portfolio Segment [Member] | Equipment [Member] | Real Estate, First Lien [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 0   0      
Consumer Borrower [Member] | Residential Portfolio Segment [Member] | Equipment [Member] | Construction Loans [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 0   0      
Consumer Borrower [Member] | Residential Portfolio Segment [Member] | Equipment [Member] | Home Equity Loan [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 0   0      
Consumer Borrower [Member] | Residential Portfolio Segment [Member] | Equipment [Member] | Real Estate, Junior Lien [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 0   0      
Consumer Borrower [Member] | Residential Portfolio Segment [Member] | Collateral, Other [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 0   0      
Consumer Borrower [Member] | Residential Portfolio Segment [Member] | Collateral, Other [Member] | Real Estate, First Lien [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 0   0      
Consumer Borrower [Member] | Residential Portfolio Segment [Member] | Collateral, Other [Member] | Construction Loans [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 0   0      
Consumer Borrower [Member] | Residential Portfolio Segment [Member] | Collateral, Other [Member] | Home Equity Loan [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 0   0      
Consumer Borrower [Member] | Residential Portfolio Segment [Member] | Collateral, Other [Member] | Real Estate, Junior Lien [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 0   0      
Consumer Borrower [Member] | Residential Portfolio Segment [Member] | Collateral Pledged [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 10,670   11,665      
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 3   589      
Consumer Borrower [Member] | Residential Portfolio Segment [Member] | Collateral Pledged [Member] | Real Estate, First Lien [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 2,585   2,514      
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 3   7      
Consumer Borrower [Member] | Residential Portfolio Segment [Member] | Collateral Pledged [Member] | Construction Loans [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 4,680   4,680      
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 0   0      
Consumer Borrower [Member] | Residential Portfolio Segment [Member] | Collateral Pledged [Member] | Home Equity Loan [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 1,100   1,366      
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 0   252      
Consumer Borrower [Member] | Residential Portfolio Segment [Member] | Collateral Pledged [Member] | Real Estate, Junior Lien [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 2,305   3,105      
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 0   330      
Consumer Borrower [Member] | Consumer Portfolio Segment [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 1,245,355   1,205,257      
Consumer Borrower [Member] | Consumer Portfolio Segment [Member] | Consumer, Other [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 41,714   44,122      
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 343 $ 363 440 $ 359 $ 328 $ 201
Consumer Borrower [Member] | Consumer Portfolio Segment [Member] | Real Estate [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 10,670   11,665      
Consumer Borrower [Member] | Consumer Portfolio Segment [Member] | Real Estate [Member] | Consumer, Other [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 0   0      
Consumer Borrower [Member] | Consumer Portfolio Segment [Member] | Equipment [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 0   0      
Consumer Borrower [Member] | Consumer Portfolio Segment [Member] | Equipment [Member] | Consumer, Other [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 0   0      
Consumer Borrower [Member] | Consumer Portfolio Segment [Member] | Collateral, Other [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 0   289      
Consumer Borrower [Member] | Consumer Portfolio Segment [Member] | Collateral, Other [Member] | Consumer, Other [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 0   289      
Consumer Borrower [Member] | Consumer Portfolio Segment [Member] | Collateral Pledged [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 10,670   11,954      
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 3   639      
Consumer Borrower [Member] | Consumer Portfolio Segment [Member] | Collateral Pledged [Member] | Consumer, Other [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 0   289      
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest $ 0   $ 50