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Loans, net and allowance for credit losses - Major Classification of Loans Portfolio Summarized by Credit Quality (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2025
Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable    
Year 1 $ 411,077 $ 365,944
Year 2 340,979 427,965
Year 3 368,012 955,611
Year 4 836,515 855,257
Year 5 745,626 257,621
Prior 937,519 796,306
Revolving Loans Amortized Cost Basis 375,020 334,666
Revolving Loans Converted to Term 1,619 135
Total 4,016,367 3,993,505
Gross charge-offs, Year 1 46 90
Gross charge-offs, Year 2 187 837
Gross charge-offs, Year 3 951 364
Gross charge-offs, Year 4 936 185
Gross charge-offs, Year 5 129 32
Gross charge-offs, Prior 624 377
Total 2,873 1,885
Commercial    
Accounts, Notes, Loans and Financing Receivable    
Year 1 65,085 62,930
Year 2 67,214 70,760
Year 3 60,831 84,663
Year 4 66,423 78,867
Year 5 53,119 32,078
Prior 111,968 93,764
Revolving Loans Amortized Cost Basis 238,838 224,972
Revolving Loans Converted to Term 1,137 68
Total 664,615 648,102
Gross charge-offs, Year 2   41
Gross charge-offs, Year 4 24 2
Gross charge-offs, Year 5 57  
Gross charge-offs, Prior 491 8
Total 572 51
Municipal    
Accounts, Notes, Loans and Financing Receivable    
Year 1 21,706 5,072
Year 2 4,594 6,254
Year 3 1,328 50,886
Year 4 47,935 99,064
Year 5 95,785 9,932
Prior 22,479 13,816
Revolving Loans Amortized Cost Basis 2,642 2,894
Total 196,469 187,918
Commercial real estate    
Accounts, Notes, Loans and Financing Receivable    
Year 1 217,182 162,417
Year 2 152,179 200,101
Year 3 187,062 662,861
Year 4 601,078 530,700
Year 5 476,531 160,309
Prior 644,116 577,725
Revolving Loans Amortized Cost Basis 116  
Revolving Loans Converted to Term 482  
Total 2,278,746 2,294,113
Gross charge-offs, Year 4 62  
Gross charge-offs, Prior 95 282
Total 157 282
Residential real estate    
Accounts, Notes, Loans and Financing Receivable    
Year 1 43,831 39,488
Year 2 38,460 45,172
Year 3 41,899 77,862
Year 4 69,329 123,280
Year 5 107,339 51,127
Prior 155,094 108,442
Revolving Loans Amortized Cost Basis 132,567 105,945
Revolving Loans Converted to Term   67
Total 588,519 551,383
Gross charge-offs, Year 4 92  
Total 92  
Consumer    
Accounts, Notes, Loans and Financing Receivable    
Year 1 22,345 28,937
Year 2 22,464 38,379
Year 3 27,488 38,877
Year 4 25,700 19,087
Year 5 11,794 4,175
Prior 3,862 2,559
Revolving Loans Amortized Cost Basis 857 855
Total 114,510 132,869
Gross charge-offs, Year 1   90
Gross charge-offs, Year 2 153 245
Gross charge-offs, Year 3 240 255
Gross charge-offs, Year 4 294 183
Gross charge-offs, Year 5 72 32
Gross charge-offs, Prior 38 87
Total 797 892
Equipment financing    
Accounts, Notes, Loans and Financing Receivable    
Year 1 40,928 67,100
Year 2 56,068 67,299
Year 3 49,404 40,462
Year 4 26,050 4,259
Year 5 1,058  
Total 173,508 179,120
Gross charge-offs, Year 1 46  
Gross charge-offs, Year 2 34 551
Gross charge-offs, Year 3 711 109
Gross charge-offs, Year 4 464  
Total 1,255 660
Pass | Commercial    
Accounts, Notes, Loans and Financing Receivable    
Year 1 64,424 61,657
Year 2 66,028 69,329
Year 3 59,297 83,123
Year 4 65,400 64,488
Year 5 52,347 29,950
Prior 109,230 91,906
Revolving Loans Amortized Cost Basis 229,520 199,737
Revolving Loans Converted to Term 272 68
Total 646,518 600,258
Pass | Municipal    
Accounts, Notes, Loans and Financing Receivable    
Year 1 21,706 5,072
Year 2 4,594 6,254
Year 3 1,328 50,886
Year 4 47,935 99,064
Year 5 95,785 9,932
Prior 22,479 13,816
Revolving Loans Amortized Cost Basis 2,642 2,894
Total 196,469 187,918
Pass | Commercial real estate    
Accounts, Notes, Loans and Financing Receivable    
Year 1 216,604 161,186
Year 2 150,957 196,779
Year 3 183,586 651,254
Year 4 592,251 525,233
Year 5 465,555 156,970
Prior 610,483 538,905
Revolving Loans Amortized Cost Basis 116  
Revolving Loans Converted to Term 397  
Total 2,219,949 2,230,327
Pass | Residential real estate    
Accounts, Notes, Loans and Financing Receivable    
Year 1 43,831 39,488
Year 2 38,460 45,172
Year 3 41,899 77,862
Year 4 69,329 123,154
Year 5 107,218 50,831
Prior 154,143 106,877
Revolving Loans Amortized Cost Basis 132,490 105,867
Revolving Loans Converted to Term   67
Total 587,370 549,318
Pass | Consumer    
Accounts, Notes, Loans and Financing Receivable    
Year 1 22,345 28,872
Year 2 22,428 38,223
Year 3 27,359 38,668
Year 4 25,462 18,963
Year 5 11,617 4,132
Prior 3,723 2,495
Revolving Loans Amortized Cost Basis 855 853
Total 113,789 132,206
Pass | Equipment financing    
Accounts, Notes, Loans and Financing Receivable    
Year 1 40,597 67,100
Year 2 55,340 66,341
Year 3 48,703 39,323
Year 4 25,170 4,259
Year 5 1,058  
Total 170,868 177,023
Special mention | Commercial    
Accounts, Notes, Loans and Financing Receivable    
Year 1 661 1,273
Year 2 1,186 1,131
Year 3 1,113 686
Year 4 499 13,475
Year 5 43 2,043
Prior 2,676 1,261
Revolving Loans Amortized Cost Basis 1,532 16,840
Revolving Loans Converted to Term 865  
Total 8,575 36,709
Special mention | Commercial real estate    
Accounts, Notes, Loans and Financing Receivable    
Year 1 578 1,231
Year 2   46
Year 3   2,724
Year 4 925 4,361
Year 5 4,623 1,635
Prior 25,778 24,951
Revolving Loans Converted to Term 85  
Total 31,989 34,948
Special mention | Equipment financing    
Accounts, Notes, Loans and Financing Receivable    
Year 2   261
Year 3 137 125
Year 4 16  
Total 153 386
Substandard | Commercial    
Accounts, Notes, Loans and Financing Receivable    
Year 2   300
Year 3 421 854
Year 4 524 904
Year 5 729 85
Prior 62 597
Revolving Loans Amortized Cost Basis 7,786 8,395
Total 9,522 11,135
Substandard | Commercial real estate    
Accounts, Notes, Loans and Financing Receivable    
Year 2 1,222 3,276
Year 3 3,476 8,883
Year 4 7,902 1,106
Year 5 6,353 1,704
Prior 7,855 13,869
Total 26,808 28,838
Substandard | Residential real estate    
Accounts, Notes, Loans and Financing Receivable    
Year 4   126
Year 5 121 296
Prior 951 1,565
Revolving Loans Amortized Cost Basis 77 78
Total 1,149 2,065
Substandard | Consumer    
Accounts, Notes, Loans and Financing Receivable    
Year 1   65
Year 2 36 156
Year 3 129 209
Year 4 238 124
Year 5 177 43
Prior 139 64
Revolving Loans Amortized Cost Basis 2 2
Total 721 663
Substandard | Equipment financing    
Accounts, Notes, Loans and Financing Receivable    
Year 1 331  
Year 2 728 697
Year 3 564 1,014
Year 4 864  
Total $ 2,487 $ 1,711