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Note 5 - Loans and Allowance for Credit Losses - Summary of Collateral Types (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Jun. 30, 2024
Dec. 31, 2023
Sep. 30, 2023
Jun. 30, 2023
Dec. 31, 2022
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss $ 3,032,343   $ 2,759,583      
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 39,142 $ 38,332 35,843 $ 36,290 $ 35,696 $ 31,146
Real Estate [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 45,778   7,591      
Equipment [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 146   22      
Collateral, Other [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 280   189      
Collateral Pledged [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 46,204   7,802      
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 6,287   2,994      
Commercial Borrower [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 2,122,945   1,849,267      
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 31,165 30,980 27,971 26,631 25,582 23,472
Commercial Borrower [Member] | Real Estate [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 33,876   6,819      
Commercial Borrower [Member] | Equipment [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 146   0      
Commercial Borrower [Member] | Collateral, Other [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 0   96      
Commercial Borrower [Member] | Collateral Pledged [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 34,022   6,915      
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 5,358   2,985      
Commercial Borrower [Member] | Commercial Portfolio Segment [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 606,245   562,180      
Commercial Borrower [Member] | Commercial Portfolio Segment [Member] | Real Estate [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 2,790   6,124      
Commercial Borrower [Member] | Commercial Portfolio Segment [Member] | Equipment [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 76   0      
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 2,866   6,124      
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 76   2,384      
Commercial Borrower [Member] | Commercial Real Estate Portfolio Segment [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 1,431,443   1,210,114      
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 23,905 24,302 18,086 17,832 17,171 14,251
Commercial Borrower [Member] | Commercial Real Estate Portfolio Segment [Member] | Construction, Land, and Development [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 173,629   124,034      
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 10,373 10,820 6,135 4,752 3,731 1,458
Commercial Borrower [Member] | Commercial Real Estate Portfolio Segment [Member] | Multifamily Loan [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 275,377   245,103      
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 2,591 2,430 1,776 1,966 1,991 1,062
Commercial Borrower [Member] | Commercial Real Estate Portfolio Segment [Member] | Non-Owner Occupied [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 686,071   569,354      
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 8,512 8,772 7,726 8,357 8,555 7,543
Commercial Borrower [Member] | Commercial Real Estate Portfolio Segment [Member] | Owner Occupied Loans [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 296,366   271,623      
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 2,429 2,280 2,449 2,757 2,894 4,188
Commercial Borrower [Member] | Commercial Real Estate Portfolio Segment [Member] | Real Estate [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 31,086   695      
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 25,005   0      
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 0   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 5,217   0      
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 864   695      
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        
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        
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        
Commercial Borrower [Member] | Commercial Real Estate Portfolio Segment [Member] | Collateral, Other [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 0   96      
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   96      
Commercial Borrower [Member] | Commercial Real Estate Portfolio Segment [Member] | Collateral Pledged [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 31,086   791      
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 5,282   601      
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 25,005   0      
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 4,984   0      
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 0   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 5,217   0      
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 864   791      
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 298   601      
Commercial Borrower [Member] | Agricultural Real Estate Portfolio Segment [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 85,257   76,973      
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 459 444 180 214 241 531
Commercial Borrower [Member] | Agricultural Real Estate Portfolio Segment [Member] | Land [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 45,821   40,832      
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 277 259 96 116 138 281
Commercial Borrower [Member] | Agricultural Real Estate Portfolio Segment [Member] | Production Loans [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 39,436   36,141      
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 182 185 84 98 103 250
Commercial Borrower [Member] | Agricultural Real Estate Portfolio Segment [Member] | Real Estate [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 0   0      
Commercial Borrower [Member] | Agricultural Real Estate Portfolio Segment [Member] | Real Estate [Member] | Land [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 0   0      
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 0   0      
Commercial Borrower [Member] | Agricultural Real Estate Portfolio Segment [Member] | Equipment [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 70   0      
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 70   0      
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 70   0      
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 0   0      
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 70   0      
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 0   0      
Consumer Borrower [Member]            
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 7,977 7,352 7,872 9,659 10,114 7,674
Consumer Borrower [Member] | Commercial Portfolio Segment [Member]            
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 6,801 6,234 9,705 8,585 8,170 8,690
Consumer Borrower [Member] | Residential Portfolio Segment [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 873,005   881,013      
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 7,618 7,024 7,671 9,398 9,803 7,143
Consumer Borrower [Member] | Residential Portfolio Segment [Member] | Real Estate, First Lien [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 690,451   697,900      
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 5,440 5,366 6,087 7,245 7,571 5,495
Consumer Borrower [Member] | Residential Portfolio Segment [Member] | Construction Loans [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 11,808   28,979      
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 103 458 485 763 785 345
Consumer Borrower [Member] | Residential Portfolio Segment [Member] | Home Equity Loan [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 134,301   118,315      
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 954 886 835 1,066 1,117 951
Consumer Borrower [Member] | Residential Portfolio Segment [Member] | Real Estate, Junior Lien [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 36,445   35,819      
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 1,121 314 264 324 330 352
Consumer Borrower [Member] | Residential Portfolio Segment [Member] | Real Estate [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 11,902   772      
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 1,948   638      
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   0      
Consumer Borrower [Member] | Residential Portfolio Segment [Member] | Real Estate [Member] | Home Equity Loan [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 1,529   64      
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 3,745   70      
Consumer Borrower [Member] | Residential Portfolio Segment [Member] | Equipment [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 0   22      
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        
Consumer Borrower [Member] | Residential Portfolio Segment [Member] | Equipment [Member] | Home Equity Loan [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 0   22      
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   93      
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   93      
Consumer Borrower [Member] | Residential Portfolio Segment [Member] | Collateral Pledged [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 11,902   887      
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 882   9      
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 1,948   638      
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 3   3      
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   0      
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 1,529   86      
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 54   0      
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 3,745   163      
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 825   6      
Consumer Borrower [Member] | Consumer Portfolio Segment [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 909,398   910,316      
Consumer Borrower [Member] | Consumer Portfolio Segment [Member] | Consumer, Other [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 36,393   29,303      
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 359 $ 328 201 $ 261 $ 311 $ 531
Consumer Borrower [Member] | Consumer Portfolio Segment [Member] | Real Estate [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 11,902   772      
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   22      
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 280   93      
Consumer Borrower [Member] | Consumer Portfolio Segment [Member] | Collateral, Other [Member] | Consumer, Other [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 280   0      
Consumer Borrower [Member] | Consumer Portfolio Segment [Member] | Collateral Pledged [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 12,182   887      
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest 929   9      
Consumer Borrower [Member] | Consumer Portfolio Segment [Member] | Collateral Pledged [Member] | Consumer, Other [Member]            
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 280   0      
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest $ 47   $ 0