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Loans, net and allowance for credit losses - Major Classification of Loans Portfolio Summarized by Credit Quality (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2025
Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable    
Year 1 $ 99,101 $ 365,944
Year 2 368,005 427,965
Year 3 407,180 955,611
Year 4 914,183 855,257
Year 5 810,121 257,621
Prior 1,037,712 796,306
Revolving Loans Amortized Cost Basis 354,659 334,666
Revolving Loans Converted to Term 578 135
Total 3,991,539 3,993,505
Gross charge-offs, Year 1   90
Gross charge-offs, Year 2 83 837
Gross charge-offs, Year 3 439 364
Gross charge-offs, Year 4 522 185
Gross charge-offs, Year 5 87 32
Gross charge-offs, Prior 102 377
Total 1,233 1,885
Commercial    
Accounts, Notes, Loans and Financing Receivable    
Year 1 20,438 62,930
Year 2 60,444 70,760
Year 3 65,892 84,663
Year 4 78,107 78,867
Year 5 67,009 32,078
Prior 126,625 93,764
Revolving Loans Amortized Cost Basis 240,310 224,972
Revolving Loans Converted to Term 33 68
Total 658,858 648,102
Gross charge-offs, Year 2   41
Gross charge-offs, Year 4 24 2
Gross charge-offs, Year 5 48  
Gross charge-offs, Prior 85 8
Total 157 51
Municipal    
Accounts, Notes, Loans and Financing Receivable    
Year 1 3,609 5,072
Year 2 9,903 6,254
Year 3 5,828 50,886
Year 4 49,590 99,064
Year 5 98,208 9,932
Prior 25,381 13,816
Revolving Loans Amortized Cost Basis 1,620 2,894
Total 194,139 187,918
Commercial real estate    
Accounts, Notes, Loans and Financing Receivable    
Year 1 38,674 162,417
Year 2 166,892 200,101
Year 3 195,360 662,861
Year 4 645,080 530,700
Year 5 515,694 160,309
Prior 712,996 577,725
Revolving Loans Converted to Term 545  
Total 2,275,241 2,294,113
Gross charge-offs, Prior   282
Total   282
Residential real estate    
Accounts, Notes, Loans and Financing Receivable    
Year 1 14,649 39,488
Year 2 38,875 45,172
Year 3 43,739 77,862
Year 4 72,524 123,280
Year 5 111,605 51,127
Prior 167,086 108,442
Revolving Loans Amortized Cost Basis 111,589 105,945
Revolving Loans Converted to Term   67
Total 560,067 551,383
Gross charge-offs, Year 4 92  
Total 92  
Consumer    
Accounts, Notes, Loans and Financing Receivable    
Year 1 4,925 28,937
Year 2 27,069 38,379
Year 3 34,241 38,877
Year 4 33,947 19,087
Year 5 16,082 4,175
Prior 5,624 2,559
Revolving Loans Amortized Cost Basis 1,140 855
Total 123,028 132,869
Gross charge-offs, Year 1   90
Gross charge-offs, Year 2 83 245
Gross charge-offs, Year 3 76 255
Gross charge-offs, Year 4 172 183
Gross charge-offs, Year 5 39 32
Gross charge-offs, Prior 17 87
Total 387 892
Equipment Financing    
Accounts, Notes, Loans and Financing Receivable    
Year 1 16,806 67,100
Year 2 64,822 67,299
Year 3 62,120 40,462
Year 4 34,935 4,259
Year 5 1,523  
Total 180,206 179,120
Gross charge-offs, Year 2   551
Gross charge-offs, Year 3 363 109
Gross charge-offs, Year 4 234  
Total 597 660
Pass | Commercial    
Accounts, Notes, Loans and Financing Receivable    
Year 1 20,438 61,657
Year 2 59,201 69,329
Year 3 64,264 83,123
Year 4 76,757 64,488
Year 5 60,353 29,950
Prior 122,994 91,906
Revolving Loans Amortized Cost Basis 216,836 199,737
Revolving Loans Converted to Term 33 68
Total 620,876 600,258
Pass | Municipal    
Accounts, Notes, Loans and Financing Receivable    
Year 1 3,609 5,072
Year 2 9,903 6,254
Year 3 5,828 50,886
Year 4 49,590 99,064
Year 5 98,208 9,932
Prior 25,381 13,816
Revolving Loans Amortized Cost Basis 1,620 2,894
Total 194,139 187,918
Pass | Commercial real estate    
Accounts, Notes, Loans and Financing Receivable    
Year 1 38,674 161,186
Year 2 165,661 196,779
Year 3 191,904 651,254
Year 4 634,715 525,233
Year 5 509,062 156,970
Prior 672,720 538,905
Revolving Loans Converted to Term 545  
Total 2,213,281 2,230,327
Pass | Residential real estate    
Accounts, Notes, Loans and Financing Receivable    
Year 1 14,649 39,488
Year 2 38,875 45,172
Year 3 43,739 77,862
Year 4 72,524 123,154
Year 5 111,481 50,831
Prior 165,829 106,877
Revolving Loans Amortized Cost Basis 111,511 105,867
Revolving Loans Converted to Term   67
Total 558,608 549,318
Pass | Consumer    
Accounts, Notes, Loans and Financing Receivable    
Year 1 4,925 28,872
Year 2 26,991 38,223
Year 3 34,101 38,668
Year 4 33,662 18,963
Year 5 15,906 4,132
Prior 5,537 2,495
Revolving Loans Amortized Cost Basis 1,030 853
Total 122,152 132,206
Pass | Equipment Financing    
Accounts, Notes, Loans and Financing Receivable    
Year 1 16,806 67,100
Year 2 64,659 66,341
Year 3 60,968 39,323
Year 4 33,982 4,259
Year 5 1,523  
Total 177,938 177,023
Special Mention | Commercial    
Accounts, Notes, Loans and Financing Receivable    
Year 1   1,273
Year 2 1,243 1,131
Year 3 1,125 686
Year 4 629 13,475
Year 5 5,787 2,043
Prior 3,087 1,261
Revolving Loans Amortized Cost Basis 16,263 16,840
Total 28,134 36,709
Special Mention | Commercial real estate    
Accounts, Notes, Loans and Financing Receivable    
Year 1   1,231
Year 2   46
Year 3 44 2,724
Year 4 1,206 4,361
Year 5 4,100 1,635
Prior 26,774 24,951
Total 32,124 34,948
Special Mention | Equipment Financing    
Accounts, Notes, Loans and Financing Receivable    
Year 2   261
Year 3 152 125
Year 4 107  
Total 259 386
Substandard | Commercial    
Accounts, Notes, Loans and Financing Receivable    
Year 2   300
Year 3 503 854
Year 4 721 904
Year 5 869 85
Prior 544 597
Revolving Loans Amortized Cost Basis 7,211 8,395
Total 9,848 11,135
Substandard | Commercial real estate    
Accounts, Notes, Loans and Financing Receivable    
Year 2 1,231 3,276
Year 3 3,412 8,883
Year 4 9,159 1,106
Year 5 2,532 1,704
Prior 13,502 13,869
Total 29,836 28,838
Substandard | Residential real estate    
Accounts, Notes, Loans and Financing Receivable    
Year 4   126
Year 5 124 296
Prior 1,257 1,565
Revolving Loans Amortized Cost Basis 78 78
Total 1,459 2,065
Substandard | Consumer    
Accounts, Notes, Loans and Financing Receivable    
Year 1   65
Year 2 78 156
Year 3 140 209
Year 4 285 124
Year 5 176 43
Prior 87 64
Revolving Loans Amortized Cost Basis 110 2
Total 876 663
Substandard | Equipment Financing    
Accounts, Notes, Loans and Financing Receivable    
Year 2 163 697
Year 3 1,000 1,014
Year 4 846  
Total $ 2,009 $ 1,711