Loans and Allowance for Credit Losses on Loans - Schedule of Allowance for Credit Losses on Loans and Recorded Investment by Portfolio Segment and Impairment Methodology (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Jun. 30, 2023	Jan. 01, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Dec. 31, 2021
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for Loans Individually Evaluated for Impairment	$ 14			$ 279
Allowance for Loan Collectively Evaluated for Impairment	21,603			18,962
Allowance for loan losses, Total	21,617	$ 20,802	$ 21,165	19,241	$ 18,369	$ 17,702	$ 16,123
Loans Individually Evaluated for Impairment	3,753			702
Loans Collectively Evaluated for Impairment	1,755,772			1,677,590
Total	1,759,525			1,678,292
Accrued interest receivable	7,100			6,400
Collateralized Mortgage-Backed Securities
Financing Receivable Allowance For Credit Losses [Line Items]
Total	3,753
Collateralized Mortgage-Backed Securities | Loans Insured or Guaranteed by non-US Government Authorities
Financing Receivable Allowance For Credit Losses [Line Items]
Total	3,400
Commercial Real Estate
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for Loans Individually Evaluated for Impairment	0			0
Allowance for Loan Collectively Evaluated for Impairment	7,498			6,951
Allowance for loan losses, Total	7,498	6,784		6,951	6,848	7,743	8,150
Loans Individually Evaluated for Impairment	739			0
Loans Collectively Evaluated for Impairment	878,085			842,208
Total	878,824			842,208
Commercial Real Estate | Collateralized Mortgage-Backed Securities
Financing Receivable Allowance For Credit Losses [Line Items]
Total	739
SBA—real estate
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for Loans Individually Evaluated for Impairment	14			0
Allowance for Loan Collectively Evaluated for Impairment	1,203			1,607
Allowance for loan losses, Total	1,217	1,218		1,607	1,539	1,800	2,022
Loans Individually Evaluated for Impairment	773			423
Loans Collectively Evaluated for Impairment	224,806			220,917
Total	225,579			221,340
SBA—real estate | Loans Insured or Guaranteed by US Government Authorities
Financing Receivable Allowance For Credit Losses [Line Items]
Total	3,400
SBA—real estate | Collateralized Mortgage-Backed Securities
Financing Receivable Allowance For Credit Losses [Line Items]
Total	773
SBA—non-real estate
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for Loans Individually Evaluated for Impairment	0			0
Allowance for Loan Collectively Evaluated for Impairment	150			207
Allowance for loan losses, Total	150	55	65	207	147	135	199
Loans Individually Evaluated for Impairment	0			0
Loans Collectively Evaluated for Impairment	14,575			13,377
Total	14,575			13,377
C&I
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for Loans Individually Evaluated for Impairment	0			279
Allowance for Loan Collectively Evaluated for Impairment	1,155			1,364
Allowance for loan losses, Total	1,155	1,270	1,323	1,643	2,393	2,102	2,848
Loans Individually Evaluated for Impairment	0			279
Loans Collectively Evaluated for Impairment	124,632			116,672
Total	124,632			116,951
Home mortgage
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for Loans Individually Evaluated for Impairment	0			0
Allowance for Loan Collectively Evaluated for Impairment	11,597			8,826
Allowance for loan losses, Total	11,597	11,472	10,579	8,826	7,434	5,913	2,891
Loans Individually Evaluated for Impairment	2,241			0
Loans Collectively Evaluated for Impairment	513,548			482,949
Total	515,789			482,949
Home mortgage | Collateralized Mortgage-Backed Securities
Financing Receivable Allowance For Credit Losses [Line Items]
Total	2,241
Consumer
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for Loans Individually Evaluated for Impairment	0			0
Allowance for Loan Collectively Evaluated for Impairment	0			7
Allowance for loan losses, Total	0	$ 3	$ 3	7	$ 8	$ 9	$ 13
Loans Individually Evaluated for Impairment	0			0
Loans Collectively Evaluated for Impairment	126			1,467
Total	$ 126			$ 1,467