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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, 2024
Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable    
Year 1 $ 40,621 $ 212,647
Year 2 220,235 726,011
Year 3 720,363 693,987
Year 4 665,978 216,917
Year 5 205,874 218,872
Prior 729,234 549,793
Revolving Loans Amortized Cost Basis 275,943 217,413
Revolving Loans Converted to Term 164 14,257
Total 2,858,412 2,849,897
Gross charge-offs, Year 2   95
Gross charge-offs, Year 3 56 101
Gross charge-offs, Year 4 39 90
Gross charge-offs, Year 5   49
Gross charge-offs, Prior 13 2,686
Gross charge-offs, Revolving Loans Amortized Cost Basis   4
Total 108 3,025
Commercial    
Accounts, Notes, Loans and Financing Receivable    
Year 1 9,059 9,871
Year 2 43,156 39,067
Year 3 59,050 28,351
Year 4 43,652 29,966
Year 5 31,963 44,584
Prior 89,641 82,773
Revolving Loans Amortized Cost Basis 184,866 133,149
Revolving Loans Converted to Term   650
Total 461,387 368,411
Gross charge-offs, Year 4   21
Gross charge-offs, Prior 5 33
Gross charge-offs, Revolving Loans Amortized Cost Basis   4
Total 5 58
Municipal    
Accounts, Notes, Loans and Financing Receivable    
Year 1 2,567 1,888
Year 2 1,378 48,095
Year 3 47,745 94,791
Year 4 94,616 10,804
Year 5 10,719 16
Prior 13,545 19,652
Revolving Loans Amortized Cost Basis 2,800 58
Total 173,370 175,304
Commercial real estate    
Accounts, Notes, Loans and Financing Receivable    
Year 1 21,826 156,446
Year 2 123,491 556,391
Year 3 531,521 493,026
Year 4 451,310 143,228
Year 5 132,196 154,483
Prior 523,507 359,427
Revolving Loans Converted to Term   117
Total 1,783,851 1,863,118
Gross charge-offs, Prior   2,598
Total   2,598
Residential real estate    
Accounts, Notes, Loans and Financing Receivable    
Year 1 3,333 17,389
Year 2 27,739 52,093
Year 3 54,794 65,280
Year 4 65,368 27,447
Year 5 26,436 16,652
Prior 98,019 84,940
Revolving Loans Amortized Cost Basis 85,637 83,512
Revolving Loans Converted to Term 164 13,490
Total 361,490 360,803
Consumer    
Accounts, Notes, Loans and Financing Receivable    
Year 1 3,836 27,053
Year 2 24,471 30,365
Year 3 27,253 12,539
Year 4 11,032 5,472
Year 5 4,560 3,137
Prior 4,522 3,001
Revolving Loans Amortized Cost Basis 2,640 694
Total 78,314 82,261
Gross charge-offs, Year 2   95
Gross charge-offs, Year 3 56 101
Gross charge-offs, Year 4 39 69
Gross charge-offs, Year 5   49
Gross charge-offs, Prior 8 55
Total 103 369
Pass | Commercial    
Accounts, Notes, Loans and Financing Receivable    
Year 1 9,059 9,856
Year 2 43,069 38,172
Year 3 58,185 28,127
Year 4 43,439 29,966
Year 5 31,963 44,551
Prior 89,109 82,190
Revolving Loans Amortized Cost Basis 183,150 131,536
Revolving Loans Converted to Term   650
Total 457,974 365,048
Pass | Municipal    
Accounts, Notes, Loans and Financing Receivable    
Year 1 2,567 1,888
Year 2 1,378 48,095
Year 3 47,745 94,791
Year 4 94,616 10,804
Year 5 10,719 16
Prior 13,545 19,652
Revolving Loans Amortized Cost Basis 2,800 58
Total 173,370 175,304
Pass | Commercial real estate    
Accounts, Notes, Loans and Financing Receivable    
Year 1 21,826 156,277
Year 2 123,323 553,754
Year 3 528,902 491,506
Year 4 449,088 143,068
Year 5 132,037 153,426
Prior 516,029 351,142
Revolving Loans Converted to Term   117
Total 1,771,205 1,849,290
Pass | Residential real estate    
Accounts, Notes, Loans and Financing Receivable    
Year 1 3,333 17,385
Year 2 27,735 52,093
Year 3 54,794 65,280
Year 4 65,368 27,118
Year 5 26,107 16,652
Prior 97,641 84,652
Revolving Loans Amortized Cost Basis 85,633 83,507
Revolving Loans Converted to Term 164 13,490
Total 360,775 360,177
Pass | Consumer    
Accounts, Notes, Loans and Financing Receivable    
Year 1 3,836 27,053
Year 2 24,447 30,307
Year 3 27,204 12,460
Year 4 10,925 5,441
Year 5 4,508 3,107
Prior 4,480 2,981
Revolving Loans Amortized Cost Basis 2,638 694
Total 78,038 82,043
Special Mention | Commercial    
Accounts, Notes, Loans and Financing Receivable    
Year 2   876
Year 3 827 182
Year 4 172  
Prior 49 49
Revolving Loans Amortized Cost Basis 832 832
Total 1,880 1,939
Special Mention | Commercial real estate    
Accounts, Notes, Loans and Financing Receivable    
Year 2   1,299
Year 3 807  
Year 4 893  
Year 5   360
Prior 385 2,761
Total 2,085 4,420
Substandard | Commercial    
Accounts, Notes, Loans and Financing Receivable    
Year 1   15
Year 2 87 19
Year 3 38 42
Year 4 41  
Year 5   33
Prior 483 534
Revolving Loans Amortized Cost Basis 884 781
Total 1,533 1,424
Substandard | Commercial real estate    
Accounts, Notes, Loans and Financing Receivable    
Year 1   169
Year 2 168 1,338
Year 3 1,812 1,520
Year 4 1,329 160
Year 5 159 697
Prior 7,093 5,524
Total 10,561 9,408
Substandard | Residential real estate    
Accounts, Notes, Loans and Financing Receivable    
Year 1   4
Year 2 4  
Year 4   329
Year 5 329  
Prior 378 288
Revolving Loans Amortized Cost Basis 4 5
Total 715 626
Substandard | Consumer    
Accounts, Notes, Loans and Financing Receivable    
Year 2 24 58
Year 3 49 79
Year 4 107 31
Year 5 52 30
Prior 42 20
Revolving Loans Amortized Cost Basis 2  
Total $ 276 $ 218