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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, 2024
Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable    
Year 1 $ 297,976 $ 212,647
Year 2 435,854 726,011
Year 3 971,690 693,987
Year 4 888,161 216,917
Year 5 277,375 218,872
Prior 841,182 549,793
Revolving Loans Amortized Cost Basis 356,993 217,413
Revolving Loans Converted to Term 452 14,257
Total 4,069,683 2,849,897
Gross charge-offs, Year 1 90  
Gross charge-offs, Year 2 242 95
Gross charge-offs, Year 3 186 101
Gross charge-offs, Year 4 127 90
Gross charge-offs, Year 5 22 49
Gross charge-offs, Prior 109 2,686
Gross charge-offs, Revolving Loans Amortized Cost Basis   4
Total 776 3,025
Commercial    
Accounts, Notes, Loans and Financing Receivable    
Year 1 56,176 9,871
Year 2 87,678 39,067
Year 3 83,181 28,351
Year 4 91,007 29,966
Year 5 44,345 44,584
Prior 109,446 82,773
Revolving Loans Amortized Cost Basis 228,072 133,149
Revolving Loans Converted to Term 7 650
Total 699,912 368,411
Gross charge-offs, Year 2 41  
Gross charge-offs, Year 4 2 21
Gross charge-offs, Prior 8 33
Gross charge-offs, Revolving Loans Amortized Cost Basis   4
Total 51 58
Municipal    
Accounts, Notes, Loans and Financing Receivable    
Year 1 5,249 1,888
Year 2 6,180 48,095
Year 3 51,520 94,791
Year 4 100,817 10,804
Year 5 10,347 16
Prior 15,999 19,652
Revolving Loans Amortized Cost Basis 55 58
Total 190,167 175,304
Commercial real estate    
Accounts, Notes, Loans and Financing Receivable    
Year 1 136,530 156,446
Year 2 191,176 556,391
Year 3 667,311 493,026
Year 4 546,579 143,228
Year 5 164,682 154,483
Prior 596,521 359,427
Revolving Loans Amortized Cost Basis 6,652  
Revolving Loans Converted to Term 137 117
Total 2,309,588 1,863,118
Gross charge-offs, Prior 27 2,598
Total 27 2,598
Residential real estate    
Accounts, Notes, Loans and Financing Receivable    
Year 1 23,736 17,389
Year 2 34,801 52,093
Year 3 78,806 65,280
Year 4 125,912 27,447
Year 5 52,941 16,652
Prior 112,908 84,940
Revolving Loans Amortized Cost Basis 121,178 83,512
Revolving Loans Converted to Term 308 13,490
Total 550,590 360,803
Consumer    
Accounts, Notes, Loans and Financing Receivable    
Year 1 25,689 27,053
Year 2 42,014 30,365
Year 3 44,450 12,539
Year 4 21,403 5,472
Year 5 5,060 3,137
Prior 6,308 3,001
Revolving Loans Amortized Cost Basis 1,036 694
Total 145,960 82,261
Gross charge-offs, Year 1 90  
Gross charge-offs, Year 2 143 95
Gross charge-offs, Year 3 186 101
Gross charge-offs, Year 4 125 69
Gross charge-offs, Year 5 22 49
Gross charge-offs, Prior 74 55
Total 640 369
Equipment Financing    
Accounts, Notes, Loans and Financing Receivable    
Year 1 50,596  
Year 2 74,005  
Year 3 46,422  
Year 4 2,443  
Total 173,466  
Gross charge-offs, Year 2 58  
Total 58  
Pass | Commercial    
Accounts, Notes, Loans and Financing Receivable    
Year 1 54,824 9,856
Year 2 85,532 38,172
Year 3 80,128 28,127
Year 4 90,107 29,966
Year 5 40,718 44,551
Prior 107,295 82,190
Revolving Loans Amortized Cost Basis 219,160 131,536
Revolving Loans Converted to Term 7 650
Total 677,771 365,048
Pass | Municipal    
Accounts, Notes, Loans and Financing Receivable    
Year 1 5,249 1,888
Year 2 6,180 48,095
Year 3 51,520 94,791
Year 4 100,817 10,804
Year 5 10,347 16
Prior 15,999 19,652
Revolving Loans Amortized Cost Basis 55 58
Total 190,167 175,304
Pass | Commercial real estate    
Accounts, Notes, Loans and Financing Receivable    
Year 1 136,530 156,277
Year 2 188,333 553,754
Year 3 660,675 491,506
Year 4 536,817 143,068
Year 5 163,176 153,426
Prior 563,148 351,142
Revolving Loans Amortized Cost Basis 6,553  
Revolving Loans Converted to Term 137 117
Total 2,255,369 1,849,290
Pass | Residential real estate    
Accounts, Notes, Loans and Financing Receivable    
Year 1 23,736 17,385
Year 2 34,797 52,093
Year 3 78,746 65,280
Year 4 125,726 27,118
Year 5 52,640 16,652
Prior 111,597 84,652
Revolving Loans Amortized Cost Basis 121,174 83,507
Revolving Loans Converted to Term 308 13,490
Total 548,724 360,177
Pass | Consumer    
Accounts, Notes, Loans and Financing Receivable    
Year 1 25,689 27,053
Year 2 41,912 30,307
Year 3 44,430 12,460
Year 4 21,337 5,441
Year 5 5,009 3,107
Prior 6,303 2,981
Revolving Loans Amortized Cost Basis 1,034 694
Total 145,714 82,043
Pass | Equipment Financing    
Accounts, Notes, Loans and Financing Receivable    
Year 1 50,596  
Year 2 72,636  
Year 3 46,005  
Year 4 2,443  
Total 171,680  
Special Mention | Commercial    
Accounts, Notes, Loans and Financing Receivable    
Year 1 1,352  
Year 2 1,136 876
Year 3 701 182
Year 4 458  
Year 5 2,449  
Prior 1,464 49
Revolving Loans Amortized Cost Basis 1,806 832
Total 9,366 1,939
Special Mention | Commercial real estate    
Accounts, Notes, Loans and Financing Receivable    
Year 2 2,342 1,299
Year 3 950  
Year 4 3,708  
Year 5 1,351 360
Prior 25,304 2,761
Revolving Loans Amortized Cost Basis 99  
Total 33,754 4,420
Special Mention | Equipment Financing    
Accounts, Notes, Loans and Financing Receivable    
Year 2 710  
Year 3 417  
Total 1,127  
Substandard | Commercial    
Accounts, Notes, Loans and Financing Receivable    
Year 1   15
Year 2 1,010 19
Year 3 2,352 42
Year 4 442  
Year 5 1,178 33
Prior 687 534
Revolving Loans Amortized Cost Basis 7,106 781
Total 12,775 1,424
Substandard | Commercial real estate    
Accounts, Notes, Loans and Financing Receivable    
Year 1   169
Year 2 501 1,338
Year 3 5,686 1,520
Year 4 6,054 160
Year 5 155 697
Prior 8,069 5,524
Total 20,465 9,408
Substandard | Residential real estate    
Accounts, Notes, Loans and Financing Receivable    
Year 1   4
Year 2 4  
Year 3 60  
Year 4 186 329
Year 5 301  
Prior 1,311 288
Revolving Loans Amortized Cost Basis 4 5
Total 1,866 626
Substandard | Consumer    
Accounts, Notes, Loans and Financing Receivable    
Year 2 102 58
Year 3 20 79
Year 4 66 31
Year 5 51 30
Prior 5 20
Revolving Loans Amortized Cost Basis 2  
Total 246 $ 218
Substandard | Equipment Financing    
Accounts, Notes, Loans and Financing Receivable    
Year 2 659  
Total $ 659