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Loans, net and allowance for credit losses - Major Classification of Loans Portfolio Summarized by Credit Quality (Details) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2024
Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable    
Year 1 $ 102,395 $ 212,647
Year 2 224,556 726,011
Year 3 727,701 693,987
Year 4 672,909 216,917
Year 5 206,265 218,872
Prior 697,999 549,793
Revolving Loans Amortized Cost Basis 237,437 217,413
Revolving Loans Converted to Term 291 14,257
Total 2,869,553 2,849,897
Gross charge-offs, Year 2 56 95
Gross charge-offs, Year 3 81 101
Gross charge-offs, Year 4 60 90
Gross charge-offs, Year 5 11 49
Gross charge-offs, Prior 35 2,686
Gross charge-offs, Revolving Loans Amortized Cost Basis   4
Total 243 3,025
Commercial    
Accounts, Notes, Loans and Financing Receivable    
Year 1 14,356 9,871
Year 2 38,036 39,067
Year 3 67,941 28,351
Year 4 65,585 29,966
Year 5 37,429 44,584
Prior 93,569 82,773
Revolving Loans Amortized Cost Basis 143,959 133,149
Revolving Loans Converted to Term 139 650
Total 461,014 368,411
Gross charge-offs, Year 2 41  
Gross charge-offs, Year 4   21
Gross charge-offs, Prior 5 33
Gross charge-offs, Revolving Loans Amortized Cost Basis   4
Total 46 58
Municipal    
Accounts, Notes, Loans and Financing Receivable    
Year 1 1,106 1,888
Year 2 1,307 48,095
Year 3 49,200 94,791
Year 4 93,134 10,804
Year 5 10,433 16
Prior 15,773 19,652
Revolving Loans Amortized Cost Basis 38 58
Total 170,991 175,304
Commercial real estate    
Accounts, Notes, Loans and Financing Receivable    
Year 1 67,209 156,446
Year 2 134,092 556,391
Year 3 535,184 493,026
Year 4 439,985 143,228
Year 5 128,730 154,483
Prior 488,360 359,427
Revolving Loans Converted to Term 92 117
Total 1,793,652 1,863,118
Gross charge-offs, Prior   2,598
Total   2,598
Residential real estate    
Accounts, Notes, Loans and Financing Receivable    
Year 1 12,525 17,389
Year 2 28,063 52,093
Year 3 50,687 65,280
Year 4 64,295 27,447
Year 5 25,796 16,652
Prior 96,322 84,940
Revolving Loans Amortized Cost Basis 91,923 83,512
Revolving Loans Converted to Term 60 13,490
Total 369,671 360,803
Consumer    
Accounts, Notes, Loans and Financing Receivable    
Year 1 7,199 27,053
Year 2 23,058 30,365
Year 3 24,689 12,539
Year 4 9,910 5,472
Year 5 3,877 3,137
Prior 3,975 3,001
Revolving Loans Amortized Cost Basis 1,517 694
Total 74,225 82,261
Gross charge-offs, Year 2 15 95
Gross charge-offs, Year 3 81 101
Gross charge-offs, Year 4 60 69
Gross charge-offs, Year 5 11 49
Gross charge-offs, Prior 30 55
Total 197 369
Pass | Commercial    
Accounts, Notes, Loans and Financing Receivable    
Year 1 13,103 9,856
Year 2 36,862 38,172
Year 3 67,146 28,127
Year 4 65,299 29,966
Year 5 35,316 44,551
Prior 91,621 82,190
Revolving Loans Amortized Cost Basis 141,169 131,536
Revolving Loans Converted to Term 139 650
Total 450,655 365,048
Pass | Municipal    
Accounts, Notes, Loans and Financing Receivable    
Year 1 1,106 1,888
Year 2 1,307 48,095
Year 3 49,200 94,791
Year 4 93,134 10,804
Year 5 10,433 16
Prior 15,773 19,652
Revolving Loans Amortized Cost Basis 38 58
Total 170,991 175,304
Pass | Commercial real estate    
Accounts, Notes, Loans and Financing Receivable    
Year 1 67,209 156,277
Year 2 131,565 553,754
Year 3 532,372 491,506
Year 4 437,529 143,068
Year 5 127,512 153,426
Prior 461,610 351,142
Revolving Loans Converted to Term 92 117
Total 1,757,889 1,849,290
Pass | Residential real estate    
Accounts, Notes, Loans and Financing Receivable    
Year 1 12,525 17,385
Year 2 28,059 52,093
Year 3 50,687 65,280
Year 4 64,295 27,118
Year 5 25,489 16,652
Prior 95,395 84,652
Revolving Loans Amortized Cost Basis 91,919 83,507
Revolving Loans Converted to Term 60 13,490
Total 368,429 360,177
Pass | Consumer    
Accounts, Notes, Loans and Financing Receivable    
Year 1 7,199 27,053
Year 2 22,998 30,307
Year 3 24,658 12,460
Year 4 9,795 5,441
Year 5 3,842 3,107
Prior 3,942 2,981
Revolving Loans Amortized Cost Basis 1,517 694
Total 73,951 82,043
Special Mention | Commercial    
Accounts, Notes, Loans and Financing Receivable    
Year 1 1,253  
Year 2 1,142 876
Year 3 733 182
Year 4 246  
Year 5 2,113  
Prior 1,451 49
Revolving Loans Amortized Cost Basis 1,777 832
Total 8,715 1,939
Special Mention | Commercial real estate    
Accounts, Notes, Loans and Financing Receivable    
Year 2 2,360 1,299
Year 3 967  
Year 4 1,138  
Year 5 1,061 360
Prior 19,988 2,761
Total 25,514 4,420
Substandard | Commercial    
Accounts, Notes, Loans and Financing Receivable    
Year 1   15
Year 2 32 19
Year 3 62 42
Year 4 40  
Year 5   33
Prior 497 534
Revolving Loans Amortized Cost Basis 1,013 781
Total 1,644 1,424
Substandard | Commercial real estate    
Accounts, Notes, Loans and Financing Receivable    
Year 1   169
Year 2 167 1,338
Year 3 1,845 1,520
Year 4 1,318 160
Year 5 157 697
Prior 6,762 5,524
Total 10,249 9,408
Substandard | Residential real estate    
Accounts, Notes, Loans and Financing Receivable    
Year 1   4
Year 2 4  
Year 4   329
Year 5 307  
Prior 927 288
Revolving Loans Amortized Cost Basis 4 5
Total 1,242 626
Substandard | Consumer    
Accounts, Notes, Loans and Financing Receivable    
Year 2 60 58
Year 3 31 79
Year 4 115 31
Year 5 35 30
Prior 33 20
Total $ 274 $ 218