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Allowance for Credit Losses and Reserve for Unfunded Loan Commitments - Activity in the Allowance for Loan Losses by Portfolio Segment (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]          
Balance, beginning of period $ 26,107 $ 25,988 $ 25,854 $ 25,196 $ 25,196
Charge-offs (184) (652) (897) (2,010)  
Recoveries 50 48 108 466  
Net charge-offs (134) (604) (789) (1,544)  
Provision for (credit to) credit losses charged to expense 1,029 534 1,937 1,419  
Balance, end of period 27,002 25,918 27,002 25,918 25,854
Cumulative effect, period of adjustment          
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]          
Balance, beginning of period       847 847
SBA loans held for investment          
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]          
Balance, beginning of period 1,457 1,556 1,221 875 875
Charge-offs (70) (100) (70) (213) (213)
Recoveries 7 1 21 16  
Net charge-offs (63) (99) (49) (197)  
Provision for (credit to) credit losses charged to expense (77) 199 145 815  
Balance, end of period 1,317 1,656 1,317 1,656 1,221
SBA loans held for investment | Cumulative effect, period of adjustment          
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]          
Balance, beginning of period       163 163
Commercial loans          
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]          
Balance, beginning of period 16,688 15,516 15,876 15,254 15,254
Charge-offs (46) (500) (282) (500) (752)
Recoveries 9 10 32 377  
Net charge-offs (37) (490) (250) (123)  
Provision for (credit to) credit losses charged to expense 923 325 1,948 49  
Balance, end of period 17,574 15,351 17,574 15,351 15,876
Commercial loans | Cumulative effect, period of adjustment          
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]          
Balance, beginning of period       171 171
Residential mortgage loans          
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]          
Balance, beginning of period 6,213 6,437 6,529 5,450 5,450
Charge-offs         (93)
Provision for (credit to) credit losses charged to expense 221 (6) (95) 605  
Balance, end of period 6,434 6,431 6,434 6,431 6,529
Residential mortgage loans | Cumulative effect, period of adjustment          
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]          
Balance, beginning of period       376 376
Consumer loans          
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]          
Balance, beginning of period 835 845 1,022 990 990
Charge-offs (68) (52) (268) (397) (578)
Recoveries 34 37 55 73  
Net charge-offs (34) (15) (213) (324)  
Provision for (credit to) credit losses charged to expense (2) 130 (10) 193  
Balance, end of period 799 960 799 960 1,022
Consumer loans | Cumulative effect, period of adjustment          
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]          
Balance, beginning of period       101 101
Residential construction loans          
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]          
Balance, beginning of period 914 1,634 1,206 2,627 2,627
Charge-offs     (277) (900) (1,000)
Net charge-offs     (277) (900)  
Provision for (credit to) credit losses charged to expense (36) (114) (51) (243)  
Balance, end of period $ 878 $ 1,520 $ 878 1,520 1,206
Residential construction loans | Cumulative effect, period of adjustment          
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]          
Balance, beginning of period       $ 36 $ 36