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Loans and Allowance for Credit Losses - Internal Risk Rating Summary (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Total commercial business loans      
2024 $ 62,883   $ 301,566
2023 327,448   927,564
2022 888,319   459,305
2021 445,329   143,841
2020 105,844   96,656
Prior 331,101   256,790
Revolving Loans Amortized Cost Basis 105,267   130,452
Revolving Loans Converted to Term 0   0
Total 2,266,191   2,316,174
Gross charge-offs      
2024 0   1,144
2023 189   10,836
2022 1,447   3,003
2021 147   141
2020 0   19
Prior 367   3,336
Revolving Loans Amortized Cost Basis 0   0
Revolving Loans Converted to Term 0   0
Total 2,150 $ 4,847 18,479
Total commercial      
Total commercial business loans      
Total 1,567,697   1,601,688
Gross charge-offs      
Total 981 141  
Total commercial | Business      
Total commercial business loans      
2024 11,058   177,667
2023 149,749   286,617
2022 262,240   93,739
2021 72,765   66,058
2020 31,428   55,744
Prior 128,999   96,960
Revolving Loans Amortized Cost Basis 86,130   20,315
Revolving Loans Converted to Term 0   0
Total 742,369   797,100
Gross charge-offs      
2024 0   0
2023 0   228
2022 614   1,250
2021 0   141
2020 0   0
Prior 367   2,953
Revolving Loans Amortized Cost Basis 0   0
Revolving Loans Converted to Term 0   0
Total 981 141 4,572
Total commercial | Real estate      
Total commercial business loans      
2024 37,733   80,553
2023 112,029   149,189
2022 134,778   213,612
2021 217,187   11,952
2020 11,813   32,517
Prior 167,009   131,522
Revolving Loans Amortized Cost Basis 518   51,239
Revolving Loans Converted to Term 0   0
Total 681,067   670,584
Gross charge-offs      
2024 0   0
2023 0   0
2022 0   0
2021 0   0
2020 0   0
Prior 0   0
Revolving Loans Amortized Cost Basis 0   0
Revolving Loans Converted to Term 0   0
Total 0 0 0
Total commercial | Acquisition, development and construction      
Total commercial business loans      
2024 5,146   6,546
2023 6,592   54,170
2022 56,763   44,187
2021 45,204   22,041
2020 23,656   0
Prior 4,400   2,237
Revolving Loans Amortized Cost Basis 2,500   4,823
Revolving Loans Converted to Term 0   0
Total 144,261   134,004
Gross charge-offs      
2024 0   0
2023 0   0
2022 0   0
2021 0   0
2020 0   0
Prior 0   0
Revolving Loans Amortized Cost Basis 0   0
Revolving Loans Converted to Term 0   0
Total 0 0 0
Residential real estate      
Total commercial business loans      
2024 8,946   33,867
2023 56,959   414,454
2022 417,220   100,177
2021 104,920   42,475
2020 38,947   7,866
Prior 30,627   22,893
Revolving Loans Amortized Cost Basis 2,825   50,815
Revolving Loans Converted to Term 0   0
Total 660,444   672,547
Gross charge-offs      
2024 0   0
2023 0   0
2022 0   0
2021 0   0
2020 0   19
Prior 0   381
Revolving Loans Amortized Cost Basis 0   0
Revolving Loans Converted to Term 0   0
Total 0 22 400
Home equity lines of credit      
Total commercial business loans      
2024 0   638
2023 58   3,942
2022 36   1,779
2021 0   1,306
2020 0   501
Prior 11   3,125
Revolving Loans Amortized Cost Basis 13,264   3,240
Revolving Loans Converted to Term 0   0
Total 13,369   14,531
Gross charge-offs      
2024 0   0
2023 0   0
2022 0   0
2021 0   0
2020 0   0
Prior 0   0
Revolving Loans Amortized Cost Basis 0   0
Revolving Loans Converted to Term 0   0
Total 0 0 0
Consumer      
Total commercial business loans      
2024 0   2,295
2023 2,061   19,192
2022 17,282   5,811
2021 5,253   9
2020 0   28
Prior 55   53
Revolving Loans Amortized Cost Basis 30   20
Revolving Loans Converted to Term 0   0
Total 24,681   27,408
Gross charge-offs      
2024 0   1,144
2023 189   10,608
2022 833   1,753
2021 147   0
2020 0   0
Prior 0   2
Revolving Loans Amortized Cost Basis 0   0
Revolving Loans Converted to Term 0   0
Total 1,169 $ 4,684 13,507
Pass      
Total commercial business loans      
2024 62,883   300,188
2023 326,177   890,814
2022 856,203   431,438
2021 402,882   138,327
2020 100,564   85,038
Prior 282,918   217,610
Revolving Loans Amortized Cost Basis 103,903   130,366
Revolving Loans Converted to Term 0   0
Total 2,135,530   2,193,781
Pass | Total commercial | Business      
Total commercial business loans      
2024 11,058   176,309
2023 148,499   251,265
2022 230,313   92,307
2021 71,110   64,964
2020 30,347   50,765
Prior 119,528   90,355
Revolving Loans Amortized Cost Basis 85,322   20,315
Revolving Loans Converted to Term 0   0
Total 696,177   746,280
Pass | Total commercial | Real estate      
Total commercial business loans      
2024 37,733   80,553
2023 112,029   149,189
2022 134,778   205,651
2021 191,268   11,952
2020 11,813   26,438
Prior 131,047   101,322
Revolving Loans Amortized Cost Basis 518   51,239
Revolving Loans Converted to Term 0   0
Total 619,186   626,344
Pass | Total commercial | Acquisition, development and construction      
Total commercial business loans      
2024 5,146   6,546
2023 6,592   54,170
2022 56,763   29,535
2021 30,552   22,041
2020 23,656   0
Prior 3,692   1,483
Revolving Loans Amortized Cost Basis 2,500   4,823
Revolving Loans Converted to Term 0   0
Total 128,901   118,598
Pass | Residential real estate      
Total commercial business loans      
2024 8,946   33,867
2023 56,959   413,466
2022 417,220   96,413
2021 104,709   38,169
2020 34,748   7,306
Prior 28,585   21,313
Revolving Loans Amortized Cost Basis 2,705   50,815
Revolving Loans Converted to Term 0   0
Total 653,872   661,349
Pass | Home equity lines of credit      
Total commercial business loans      
2024 0   638
2023 58   3,798
2022 36   1,779
2021 0   1,192
2020 0   501
Prior 11   3,084
Revolving Loans Amortized Cost Basis 12,828   3,154
Revolving Loans Converted to Term 0   0
Total 12,933   14,146
Pass | Consumer      
Total commercial business loans      
2024 0   2,275
2023 2,040   18,926
2022 17,093   5,753
2021 5,243   9
2020 0   28
Prior 55   53
Revolving Loans Amortized Cost Basis 30   20
Revolving Loans Converted to Term 0   0
Total 24,461   27,064
Special Mention      
Total commercial business loans      
2024 0   990
2023 0   32,403
2022 29,776   22,685
2021 26,104   5,090
2020 4,935   6,832
Prior 22,405   15,717
Revolving Loans Amortized Cost Basis 271   86
Revolving Loans Converted to Term 0   0
Total 83,491   83,803
Special Mention | Total commercial | Business      
Total commercial business loans      
2024 0   990
2023 0   32,342
2022 29,776   72
2021 185   830
2020 817   339
Prior 4,094   3,767
Revolving Loans Amortized Cost Basis 0   0
Revolving Loans Converted to Term 0   0
Total 34,872   38,340
Special Mention | Total commercial | Real estate      
Total commercial business loans      
2024 0   0
2023 0   0
2022 0   7,961
2021 25,919   0
2020 0   6,079
Prior 17,150   11,201
Revolving Loans Amortized Cost Basis 0   0
Revolving Loans Converted to Term 0   0
Total 43,069   25,241
Special Mention | Total commercial | Acquisition, development and construction      
Total commercial business loans      
2024 0   0
2023 0   0
2022 0   14,652
2021 0   0
2020 0   0
Prior 0   0
Revolving Loans Amortized Cost Basis 0   0
Revolving Loans Converted to Term 0   0
Total 0   14,652
Special Mention | Residential real estate      
Total commercial business loans      
2024 0   0
2023 0   0
2022 0   0
2021 0   4,224
2020 4,118   414
Prior 1,161   708
Revolving Loans Amortized Cost Basis 0   0
Revolving Loans Converted to Term 0   0
Total 5,279   5,346
Special Mention | Home equity lines of credit      
Total commercial business loans      
2024 0   0
2023 0   61
2022 0   0
2021 0   36
2020 0   0
Prior 0   41
Revolving Loans Amortized Cost Basis 271   86
Revolving Loans Converted to Term 0   0
Total 271   224
Special Mention | Consumer      
Total commercial business loans      
2024 0   0
2023 0   0
2022 0   0
2021 0   0
2020 0   0
Prior 0   0
Revolving Loans Amortized Cost Basis 0   0
Revolving Loans Converted to Term 0   0
Total 0   0
Substandard      
Total commercial business loans      
2024 0   388
2023 1,271   2,325
2022 1,416   4,343
2021 15,353   160
2020 81   4,786
Prior 24,656   21,966
Revolving Loans Amortized Cost Basis 1,093   0
Revolving Loans Converted to Term 0   0
Total 43,870   33,968
Substandard | Total commercial | Business      
Total commercial business loans      
2024 0   368
2023 1,250   988
2022 1,227   521
2021 691   0
2020 0   4,640
Prior 4,349   1,436
Revolving Loans Amortized Cost Basis 808   0
Revolving Loans Converted to Term 0   0
Total 8,325   7,953
Substandard | Total commercial | Real estate      
Total commercial business loans      
2024 0   0
2023 0   0
2022 0   0
2021 0   0
2020 0   0
Prior 18,812   18,999
Revolving Loans Amortized Cost Basis 0   0
Revolving Loans Converted to Term 0   0
Total 18,812   18,999
Substandard | Total commercial | Acquisition, development and construction      
Total commercial business loans      
2024 0   0
2023 0   0
2022 0   0
2021 14,652   0
2020 0   0
Prior 708   754
Revolving Loans Amortized Cost Basis 0   0
Revolving Loans Converted to Term 0   0
Total 15,360   754
Substandard | Residential real estate      
Total commercial business loans      
2024 0   0
2023 0   988
2022 0   3,764
2021 0   82
2020 81   146
Prior 787   777
Revolving Loans Amortized Cost Basis 120   0
Revolving Loans Converted to Term 0   0
Total 988   5,757
Substandard | Home equity lines of credit      
Total commercial business loans      
2024 0   0
2023 0   83
2022 0   0
2021 0   78
2020 0   0
Prior 0   0
Revolving Loans Amortized Cost Basis 165   0
Revolving Loans Converted to Term 0   0
Total 165   161
Substandard | Consumer      
Total commercial business loans      
2024 0   20
2023 21   266
2022 189   58
2021 10   0
2020 0   0
Prior 0   0
Revolving Loans Amortized Cost Basis 0   0
Revolving Loans Converted to Term 0   0
Total 220   344
Doubtful      
Total commercial business loans      
2024 0   0
2023 0   2,022
2022 924   839
2021 990   264
2020 264   0
Prior 1,122   1,497
Revolving Loans Amortized Cost Basis 0   0
Revolving Loans Converted to Term 0   0
Total 3,300   4,622
Doubtful | Total commercial | Business      
Total commercial business loans      
2024 0   0
2023 0   2,022
2022 924   839
2021 779   264
2020 264   0
Prior 1,028   1,402
Revolving Loans Amortized Cost Basis 0   0
Revolving Loans Converted to Term 0   0
Total 2,995   4,527
Doubtful | Total commercial | Real estate      
Total commercial business loans      
2024 0   0
2023 0   0
2022 0   0
2021 0   0
2020 0   0
Prior 0   0
Revolving Loans Amortized Cost Basis 0   0
Revolving Loans Converted to Term 0   0
Total 0   0
Doubtful | Total commercial | Acquisition, development and construction      
Total commercial business loans      
2024 0   0
2023 0   0
2022 0   0
2021 0   0
2020 0   0
Prior 0   0
Revolving Loans Amortized Cost Basis 0   0
Revolving Loans Converted to Term 0   0
Total 0   0
Doubtful | Residential real estate      
Total commercial business loans      
2024 0   0
2023 0   0
2022 0   0
2021 211   0
2020 0   0
Prior 94   95
Revolving Loans Amortized Cost Basis 0   0
Revolving Loans Converted to Term 0   0
Total 305   95
Doubtful | Home equity lines of credit      
Total commercial business loans      
2024 0   0
2023 0   0
2022 0   0
2021 0   0
2020 0   0
Prior 0   0
Revolving Loans Amortized Cost Basis 0   0
Revolving Loans Converted to Term 0   0
Total 0   0
Doubtful | Consumer      
Total commercial business loans      
2024 0   0
2023 0   0
2022 0   0
2021 0   0
2020 0   0
Prior 0   0
Revolving Loans Amortized Cost Basis 0   0
Revolving Loans Converted to Term 0   0
Total $ 0   $ 0