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Note 4 - Loans and Allowance for Credit Losses - Allowance for Loan Losses by Portfolio Segment (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Beginning Balance $ 59,278 $ 38,332 $ 59,929 $ 35,843 $ 35,843
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Provisions 1,136 [1] 1,126 [1] 4,657 [2] 6,195 [1]  
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Charge-offs (740) (505) (5,469) (3,444) (4,833)
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Recovery 2,453 189 3,010 548  
Financing Receivable, Allowance for Credit Loss, Ending Balance 62,127 39,142 62,127 39,142 59,929
Consumer Borrower [Member]          
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Beginning Balance 9,572 7,352 9,799 7,872 7,872
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Provisions 2,561 [1] 784 [1] 2,901 [2] 183 [1]  
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Charge-offs (134) (161) (826) (177)  
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Recovery 28 2 153 99  
Financing Receivable, Allowance for Credit Loss, Ending Balance 12,027 7,977 12,027 7,977 9,799
Consumer Borrower [Member] | Commercial Portfolio Segment [Member]          
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Beginning Balance 8,326 6,234 8,170 9,705 9,705
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Provisions 3,270 [1] 660 [1] 3,276 [2] (159) [1]  
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Charge-offs (606) (246) (854) (3,140)  
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Recovery 2,415 153 2,813 395  
Financing Receivable, Allowance for Credit Loss, Ending Balance 13,405 6,801 13,405 6,801 8,170
Consumer Borrower [Member] | Residential Portfolio Segment [Member]          
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Beginning Balance 9,209 7,024 9,359 7,671 7,671
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Provisions 2,549 [1] 594 [1] 3,013 [2] (124) [1]  
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Charge-offs (100) 0 (714) (3)  
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Recovery 26 0 26 74  
Financing Receivable, Allowance for Credit Loss, Ending Balance 11,684 7,618 11,684 7,618 9,359
Consumer Borrower [Member] | Residential Portfolio Segment [Member] | Real Estate, First Lien [Member]          
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Beginning Balance 7,059 5,366 6,921 6,087 6,087
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Provisions 2,235 [1] 74 [1] 2,427 [2] (647) [1]  
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Charge-offs 0 0 (54) 0 0
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Recovery 0 0 0 0  
Financing Receivable, Allowance for Credit Loss, Ending Balance 9,294 5,440 9,294 5,440 6,921
Consumer Borrower [Member] | Residential Portfolio Segment [Member] | Construction Loans [Member]          
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Beginning Balance 416 458 357 485 485
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Provisions (144) [1] (355) [1] (85) [2] (382) [1]  
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Charge-offs 0 0 0 0 0
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Recovery 0 0 0 0  
Financing Receivable, Allowance for Credit Loss, Ending Balance 272 103 272 103 357
Consumer Borrower [Member] | Residential Portfolio Segment [Member] | Home Equity Loan [Member]          
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Beginning Balance 1,358 886 1,339 835 835
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Provisions 395 [1] 68 [1] 674 [2] 119 [1]  
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Charge-offs (100) 0 (360) 0 (19)
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Recovery 26 0 26 0  
Financing Receivable, Allowance for Credit Loss, Ending Balance 1,679 954 1,679 954 1,339
Consumer Borrower [Member] | Residential Portfolio Segment [Member] | Real Estate, Junior Lien [Member]          
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Beginning Balance 376 314 742 264 264
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Provisions 63 [1] 807 [1] (3) [2] 786 [1]  
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Charge-offs 0 0 (300) (3) (638)
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Recovery 0 0 0 74  
Financing Receivable, Allowance for Credit Loss, Ending Balance 439 1,121 439 1,121 742
Consumer Borrower [Member] | Consumer Portfolio Segment [Member] | Consumer, Other [Member]          
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Beginning Balance 363 328 440 201 201
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Provisions 12 [1] 190 [1] (112) [2] 307 [1]  
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Charge-offs (34) (161) (112) (174) (186)
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Recovery 2 2 127 25  
Financing Receivable, Allowance for Credit Loss, Ending Balance 343 359 343 359 440
Commercial Borrower [Member]          
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Beginning Balance 49,706 30,980 50,130 27,971 27,971
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Provisions (1,425) [1] 342 [1] 1,756 [2] 6,012 [1]  
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Charge-offs (606) (344) (4,643) (3,267)  
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Recovery 2,425 187 2,857 449  
Financing Receivable, Allowance for Credit Loss, Ending Balance 50,100 31,165 50,100 31,165 50,130
Commercial Borrower [Member] | Commercial Portfolio Segment [Member]          
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Charge-offs     (854)   (3,727)
Commercial Borrower [Member] | Commercial Real Estate Portfolio Segment [Member]          
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Beginning Balance 40,142 24,302 40,732 18,086 18,086
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Provisions (5,144) [1] (313) [1] (2,351) [2] 5,912 [1]  
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Charge-offs 0 (98) (3,405) (127)  
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Recovery 10 14 32 34  
Financing Receivable, Allowance for Credit Loss, Ending Balance 35,008 23,905 35,008 23,905 40,732
Commercial Borrower [Member] | Commercial Real Estate Portfolio Segment [Member] | Construction, Land, and Development [Member]          
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Beginning Balance 18,529 10,820 16,277 6,135 6,135
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Provisions (1,272) [1] (447) [1] 980 [2] 4,238 [1]  
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Charge-offs 0 0 0 0 0
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Recovery 0 0 0 0  
Financing Receivable, Allowance for Credit Loss, Ending Balance 17,257 10,373 17,257 10,373 16,277
Commercial Borrower [Member] | Commercial Real Estate Portfolio Segment [Member] | Multifamily Loan [Member]          
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Beginning Balance 4,876 2,430 4,716 1,776 1,776
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Provisions (539) [1] 161 [1] (379) [2] 815 [1]  
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Charge-offs 0 0 0 0 0
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Recovery 0 0 0 0  
Financing Receivable, Allowance for Credit Loss, Ending Balance 4,337 2,591 4,337 2,591 4,716
Commercial Borrower [Member] | Commercial Real Estate Portfolio Segment [Member] | Non-Owner Occupied [Member]          
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Beginning Balance 12,919 8,772 16,513 7,726 7,726
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Provisions (2,796) [1] (260) [1] (2,989) [2] 786 [1]  
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Charge-offs 0 0 (3,401) 0 0
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Recovery 0 0 0 0  
Financing Receivable, Allowance for Credit Loss, Ending Balance 10,123 8,512 10,123 8,512 16,513
Commercial Borrower [Member] | Commercial Real Estate Portfolio Segment [Member] | Owner Occupied Loans [Member]          
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Beginning Balance 3,818 2,280 3,226 2,449 2,449
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Provisions (537) [1] 233 [1] 37 [2] 73 [1]  
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Charge-offs 0 (98) (4) (127) (237)
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Recovery 10 14 32 34  
Financing Receivable, Allowance for Credit Loss, Ending Balance 3,291 2,429 3,291 2,429 3,226
Commercial Borrower [Member] | Agricultural Real Estate Portfolio Segment [Member]          
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Beginning Balance 1,238 444 1,228 180 180
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Provisions 449 [1] (5) [1] 831 [2] 259 [1]  
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Charge-offs 0 0 (384) 0  
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Recovery 0 20 12 20  
Financing Receivable, Allowance for Credit Loss, Ending Balance 1,687 459 1,687 459 1,228
Commercial Borrower [Member] | Agricultural Real Estate Portfolio Segment [Member] | Land [Member]          
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Beginning Balance 615 259 597 96 96
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Provisions 384 [1] (2) [1] 402 [2] 161 [1]  
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Charge-offs 0 0 0 0 0
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Recovery 0 20 0 20  
Financing Receivable, Allowance for Credit Loss, Ending Balance 999 277 999 277 597
Commercial Borrower [Member] | Agricultural Real Estate Portfolio Segment [Member] | Production Loans [Member]          
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Beginning Balance 623 185 631 84 84
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Provisions 65 [1] (3) [1] 429 [2] 98 [1]  
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Charge-offs 0 0 (384) 0 (26)
Financing Receivable, Allowance for Credit Loss, Excluding Accrued Interest, Recovery 0 0 12 0  
Financing Receivable, Allowance for Credit Loss, Ending Balance $ 688 $ 182 $ 688 $ 182 $ 631
[1] The difference in the credit loss expense reported herein compared to the consolidated statements of income is associated with the credit loss expense of ($31) thousand related to off-balance sheet credit exposure and ($76) thousand related to HTM investment securities.
[2] The difference in the credit loss expense reported herein compared to the consolidated statements of income is associated with the credit loss expense of ($3.9) million related to off-balance sheet credit exposure, ($6) thousand related to HTM investment securities, and $78 thousand related to non-mortgage loans transferred to held for sale.