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Loans and Allowance for Credit Losses - Internal Risk Rating Summary (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Total commercial business loans          
2023 $ 167,354   $ 167,354    
2022 944,329   944,329    
2021 506,108   506,108    
2020 107,133   107,133    
2019 65,183   65,183    
Prior 245,171   245,171    
Revolving Loans Amortized Cost Basis 233,374   233,374    
Revolving Loans Converted to Term 0   0    
Total loans 2,268,652 $ 2,470,438 2,268,652 $ 2,470,438 $ 2,370,662
Gross charge-offs          
2023     866    
2022     9,771    
2021     2,497    
2020     141    
2019     0    
Prior     3,336    
Revolving Loans Amortized Cost Basis     0    
Revolving Loans Converted to Term     0    
Total 8,064 3,652 16,611 7,304  
Total commercial          
Total commercial business loans          
Total loans 1,573,128 1,705,138 1,573,128 1,705,138 1,610,910
Gross charge-offs          
Total 4,028 0 4,297 0  
Total commercial | Business          
Total commercial business loans          
2023 49,607   49,607    
2022 300,303   300,303    
2021 119,894   119,894    
2020 29,841   29,841    
2019 20,863   20,863    
Prior 70,984   70,984    
Revolving Loans Amortized Cost Basis 219,711   219,711    
Revolving Loans Converted to Term 0   0    
Total loans 811,203 872,268 811,203 872,268 851,072
Gross charge-offs          
2023     0    
2022     228    
2021     975    
2020     141    
2019     0    
Prior     2,953    
Revolving Loans Amortized Cost Basis     0    
Revolving Loans Converted to Term     0    
Total 4,028 0 4,297 0  
Total commercial | Real estate          
Total commercial business loans          
2023 60,509   60,509    
2022 158,327   158,327    
2021 230,780   230,780    
2020 12,094   12,094    
2019 33,393   33,393    
Prior 145,064   145,064    
Revolving Loans Amortized Cost Basis 0   0    
Revolving Loans Converted to Term 0   0    
Total loans 640,167 701,485 640,167 701,485 632,839
Gross charge-offs          
2023     0    
2022     0    
2021     0    
2020     0    
2019     0    
Prior     0    
Revolving Loans Amortized Cost Basis     0    
Revolving Loans Converted to Term     0    
Total 0 0 0 0  
Total commercial | Acquisition, development and construction          
Total commercial business loans          
2023 2,987   2,987    
2022 46,062   46,062    
2021 45,244   45,244    
2020 22,016   22,016    
2019 3,128   3,128    
Prior 2,321   2,321    
Revolving Loans Amortized Cost Basis 0   0    
Revolving Loans Converted to Term 0   0    
Total loans 121,758 131,385 121,758 131,385 126,999
Gross charge-offs          
2023     0    
2022     0    
2021     0    
2020     0    
2019     0    
Prior     0    
Revolving Loans Amortized Cost Basis     0    
Revolving Loans Converted to Term     0    
Total 0 0 0 0  
Residential real estate          
Total commercial business loans          
2023 51,593   51,593    
2022 418,411   418,411    
2021 103,796   103,796    
2020 43,182   43,182    
2019 7,581   7,581    
Prior 25,758   25,758    
Revolving Loans Amortized Cost Basis 0   0    
Revolving Loans Converted to Term 0   0    
Total loans 650,321 604,635 650,321 604,635 609,452
Gross charge-offs          
2023     0    
2022     0    
2021     0    
2020     0    
2019     0    
Prior     381    
Revolving Loans Amortized Cost Basis     0    
Revolving Loans Converted to Term     0    
Total 359 0 381 0  
Home Equity          
Total commercial business loans          
2023 0   0    
2022 37   37    
2021 0   0    
2020 0   0    
2019 170   170    
Prior 1,021   1,021    
Revolving Loans Amortized Cost Basis 13,634   13,634    
Revolving Loans Converted to Term 0   0    
Total loans 14,862 19,376 14,862 19,376 18,734
Gross charge-offs          
2023     0    
2022     0    
2021     0    
2020     0    
2019     0    
Prior     0    
Revolving Loans Amortized Cost Basis     0    
Revolving Loans Converted to Term     0    
Total 0 0 0 0  
Consumer          
Total commercial business loans          
2023 2,658   2,658    
2022 21,189   21,189    
2021 6,394   6,394    
2020 0   0    
2019 48   48    
Prior 23   23    
Revolving Loans Amortized Cost Basis 29   29    
Revolving Loans Converted to Term 0   0    
Total loans 30,341 141,289 30,341 141,289 131,566
Gross charge-offs          
2023     866    
2022     9,543    
2021     1,522    
2020     0    
2019     0    
Prior     2    
Revolving Loans Amortized Cost Basis     0    
Revolving Loans Converted to Term     0    
Total 3,677 $ 3,652 11,933 $ 7,304  
Pass          
Total commercial business loans          
2023 167,156   167,156    
2022 935,459   935,459    
2021 443,830   443,830    
2020 101,787   101,787    
2019 52,460   52,460    
Prior 197,769   197,769    
Revolving Loans Amortized Cost Basis 232,716   232,716    
Revolving Loans Converted to Term 0   0    
Total loans 2,131,177   2,131,177   2,299,448
Pass | Total commercial          
Total commercial business loans          
Total loans         1,544,104
Pass | Total commercial | Business          
Total commercial business loans          
2023 49,607   49,607    
2022 293,000   293,000    
2021 84,060   84,060    
2020 28,735   28,735    
2019 15,491   15,491    
Prior 60,635   60,635    
Revolving Loans Amortized Cost Basis 219,201   219,201    
Revolving Loans Converted to Term 0   0    
Total loans 750,729   750,729   830,319
Pass | Total commercial | Real estate          
Total commercial business loans          
2023 60,509   60,509    
2022 158,327   158,327    
2021 222,770   222,770    
2020 12,094   12,094    
2019 26,592   26,592    
Prior 110,857   110,857    
Revolving Loans Amortized Cost Basis 0   0    
Revolving Loans Converted to Term 0   0    
Total loans 591,149   591,149   592,997
Pass | Total commercial | Acquisition, development and construction          
Total commercial business loans          
2023 2,987   2,987    
2022 46,062   46,062    
2021 30,768   30,768    
2020 22,016   22,016    
2019 3,128   3,128    
Prior 1,551   1,551    
Revolving Loans Amortized Cost Basis 0   0    
Revolving Loans Converted to Term 0   0    
Total loans 106,512   106,512   120,788
Pass | Residential real estate          
Total commercial business loans          
2023 51,593   51,593    
2022 417,420   417,420    
2021 100,007   100,007    
2020 38,942   38,942    
2019 7,031   7,031    
Prior 23,923   23,923    
Revolving Loans Amortized Cost Basis 0   0    
Revolving Loans Converted to Term 0   0    
Total loans 638,916   638,916   605,513
Pass | Home Equity          
Total commercial business loans          
2023 0   0    
2022 37   37    
2021 0   0    
2020 0   0    
2019 170   170    
Prior 780   780    
Revolving Loans Amortized Cost Basis 13,486   13,486    
Revolving Loans Converted to Term 0   0    
Total loans 14,473   14,473   18,269
Pass | Consumer          
Total commercial business loans          
2023 2,460   2,460    
2022 20,613   20,613    
2021 6,225   6,225    
2020 0   0    
2019 48   48    
Prior 23   23    
Revolving Loans Amortized Cost Basis 29   29    
Revolving Loans Converted to Term 0   0    
Total loans 29,398   29,398   131,562
Special Mention          
Total commercial business loans          
2023 0   0    
2022 5,231   5,231    
2021 22,499   22,499    
2020 842   842    
2019 7,225   7,225    
Prior 20,218   20,218    
Revolving Loans Amortized Cost Basis 658   658    
Revolving Loans Converted to Term 0   0    
Total loans 56,673   56,673   31,258
Special Mention | Total commercial          
Total commercial business loans          
Total loans         30,123
Special Mention | Total commercial | Business          
Total commercial business loans          
2023 0   0    
2022 5,231   5,231    
2021 13   13    
2020 842   842    
2019 10   10    
Prior 4,418   4,418    
Revolving Loans Amortized Cost Basis 510   510    
Revolving Loans Converted to Term 0   0    
Total loans 11,024   11,024   5,963
Special Mention | Total commercial | Real estate          
Total commercial business loans          
2023 0   0    
2022 0   0    
2021 8,010   8,010    
2020 0   0    
2019 6,801   6,801    
Prior 14,994   14,994    
Revolving Loans Amortized Cost Basis 0   0    
Revolving Loans Converted to Term 0   0    
Total loans 29,805   29,805   18,883
Special Mention | Total commercial | Acquisition, development and construction          
Total commercial business loans          
2023 0   0    
2022 0   0    
2021 14,476   14,476    
2020 0   0    
2019 0   0    
Prior 5   5    
Revolving Loans Amortized Cost Basis 0   0    
Revolving Loans Converted to Term 0   0    
Total loans 14,481   14,481   5,277
Special Mention | Residential real estate          
Total commercial business loans          
2023 0   0    
2022 0   0    
2021 0   0    
2020 0   0    
2019 414   414    
Prior 725   725    
Revolving Loans Amortized Cost Basis 0   0    
Revolving Loans Converted to Term 0   0    
Total loans 1,139   1,139   760
Special Mention | Home Equity          
Total commercial business loans          
2023 0   0    
2022 0   0    
2021 0   0    
2020 0   0    
2019 0   0    
Prior 76   76    
Revolving Loans Amortized Cost Basis 148   148    
Revolving Loans Converted to Term 0   0    
Total loans 224   224   375
Special Mention | Consumer          
Total commercial business loans          
2023 0   0    
2022 0   0    
2021 0   0    
2020 0   0    
2019 0   0    
Prior 0   0    
Revolving Loans Amortized Cost Basis 0   0    
Revolving Loans Converted to Term 0   0    
Total loans 0   0   0
Substandard          
Total commercial business loans          
2023 198   198    
2022 1,568   1,568    
2021 39,311   39,311    
2020 4,240   4,240    
2019 5,498   5,498    
Prior 25,567   25,567    
Revolving Loans Amortized Cost Basis 0   0    
Revolving Loans Converted to Term 0   0    
Total loans 76,382   76,382   35,287
Substandard | Total commercial          
Total commercial business loans          
Total loans         33,637
Substandard | Total commercial | Business          
Total commercial business loans          
2023 0   0    
2022 1   1    
2021 35,353   35,353    
2020 0   0    
2019 5,362   5,362    
Prior 4,525   4,525    
Revolving Loans Amortized Cost Basis 0   0    
Revolving Loans Converted to Term 0   0    
Total loans 45,241   45,241   12,103
Substandard | Total commercial | Real estate          
Total commercial business loans          
2023 0   0    
2022 0   0    
2021 0   0    
2020 0   0    
2019 0   0    
Prior 19,213   19,213    
Revolving Loans Amortized Cost Basis 0   0    
Revolving Loans Converted to Term 0   0    
Total loans 19,213   19,213   20,600
Substandard | Total commercial | Acquisition, development and construction          
Total commercial business loans          
2023 0   0    
2022 0   0    
2021 0   0    
2020 0   0    
2019 0   0    
Prior 765   765    
Revolving Loans Amortized Cost Basis 0   0    
Revolving Loans Converted to Term 0   0    
Total loans 765   765   934
Substandard | Residential real estate          
Total commercial business loans          
2023 0   0    
2022 991   991    
2021 3,789   3,789    
2020 4,240   4,240    
2019 136   136    
Prior 899   899    
Revolving Loans Amortized Cost Basis 0   0    
Revolving Loans Converted to Term 0   0    
Total loans 10,055   10,055   1,556
Substandard | Home Equity          
Total commercial business loans          
2023 0   0    
2022 0   0    
2021 0   0    
2020 0   0    
2019 0   0    
Prior 165   165    
Revolving Loans Amortized Cost Basis 0   0    
Revolving Loans Converted to Term 0   0    
Total loans 165   165   90
Substandard | Consumer          
Total commercial business loans          
2023 198   198    
2022 576   576    
2021 169   169    
2020 0   0    
2019 0   0    
Prior 0   0    
Revolving Loans Amortized Cost Basis 0   0    
Revolving Loans Converted to Term 0   0    
Total loans 943   943   4
Doubtful          
Total commercial business loans          
2023 0   0    
2022 2,071   2,071    
2021 468   468    
2020 264   264    
2019 0   0    
Prior 1,617   1,617    
Revolving Loans Amortized Cost Basis 0   0    
Revolving Loans Converted to Term 0   0    
Total loans 4,420   4,420   4,669
Doubtful | Total commercial          
Total commercial business loans          
Total loans         3,046
Doubtful | Total commercial | Business          
Total commercial business loans          
2023 0   0    
2022 2,071   2,071    
2021 468   468    
2020 264   264    
2019 0   0    
Prior 1,406   1,406    
Revolving Loans Amortized Cost Basis 0   0    
Revolving Loans Converted to Term 0   0    
Total loans 4,209   4,209   2,687
Doubtful | Total commercial | Real estate          
Total commercial business loans          
2023 0   0    
2022 0   0    
2021 0   0    
2020 0   0    
2019 0   0    
Prior 0   0    
Revolving Loans Amortized Cost Basis 0   0    
Revolving Loans Converted to Term 0   0    
Total loans 0   0   359
Doubtful | Total commercial | Acquisition, development and construction          
Total commercial business loans          
2023 0   0    
2022 0   0    
2021 0   0    
2020 0   0    
2019 0   0    
Prior 0   0    
Revolving Loans Amortized Cost Basis 0   0    
Revolving Loans Converted to Term 0   0    
Total loans 0   0   0
Doubtful | Residential real estate          
Total commercial business loans          
2023 0   0    
2022 0   0    
2021 0   0    
2020 0   0    
2019 0   0    
Prior 211   211    
Revolving Loans Amortized Cost Basis 0   0    
Revolving Loans Converted to Term 0   0    
Total loans 211   211   1,623
Doubtful | Home Equity          
Total commercial business loans          
2023 0   0    
2022 0   0    
2021 0   0    
2020 0   0    
2019 0   0    
Prior 0   0    
Revolving Loans Amortized Cost Basis 0   0    
Revolving Loans Converted to Term 0   0    
Total loans 0   0   0
Doubtful | Consumer          
Total commercial business loans          
2023 0   0    
2022 0   0    
2021 0   0    
2020 0   0    
2019 0   0    
Prior 0   0    
Revolving Loans Amortized Cost Basis 0   0    
Revolving Loans Converted to Term 0   0    
Total loans $ 0   $ 0   $ 0