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Loans Receivable - Summary of loans by year of origination, internally assigned credit grades and risk characteristics (Detail) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2023
Dec. 31, 2022
Financing Receivable, Credit Quality Indicator [Line Items]    
Total $ 1,500,811 $ 1,372,824
Commercial Real Estate [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current period gross charge-offs 2023 0  
Current period gross charge-offs 2022 0  
Current period gross charge-offs 2021 0  
Current period gross charge-offs 2020 0  
Current period gross charge-offs 2019 0  
Current period gross charge-offs Prior 1,718  
Current period gross charge-offs Revolving Loans 0  
Current period gross charge-offs Total 1,718  
Commercial And Industrial [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current period gross charge-offs 2023 0  
Current period gross charge-offs 2022 0  
Current period gross charge-offs 2021 0  
Current period gross charge-offs 2020 0  
Current period gross charge-offs 2019 0  
Current period gross charge-offs Prior 2  
Current period gross charge-offs Revolving Loans 0  
Current period gross charge-offs Total 2  
Construction Loans [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Current period gross charge-offs 2023 0  
Current period gross charge-offs 2022 0  
Current period gross charge-offs 2021 0  
Current period gross charge-offs 2020 0  
Current period gross charge-offs 2019 0  
Current period gross charge-offs Prior 148  
Current period gross charge-offs Revolving Loans 0  
Current period gross charge-offs Total 148  
Pass [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total   1,362,973
Special Mention [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total   3,392
Substandard [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
Total   $ 6,459
Loans Receivable [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2023 51,117  
2022 246,822  
2021 216,279  
2020 73,689  
2019 187,719  
Prior 498,524  
Revolving Loans 226,661  
Total 1,500,811  
Loans Receivable [Member] | Commercial Real Estate [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2023 47,531  
2022 235,341  
2021 119,682  
2020 54,153  
2019 173,138  
Prior 435,279  
Revolving Loans 15,164  
Total 1,080,288  
Loans Receivable [Member] | Commercial And Industrial [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2023 1,749  
2022 6,041  
2021 1,143  
2020 1,987  
2019 8,019  
Prior 26,654  
Revolving Loans 6,564  
Total 52,157  
Loans Receivable [Member] | Construction Loans [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2023 792  
2022 4,409  
2021 89,500  
2020 14,682  
2019 5,000  
Prior 4,414  
Revolving Loans 202,027  
Total 320,824  
Loans Receivable [Member] | Residential FirstLien Mortgage [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2023 0  
2022 993  
2021 5,635  
2020 2,863  
2019 1,562  
Prior 28,629  
Revolving Loans 0  
Total 39,682  
Loans Receivable [Member] | Residential FirstLien Mortgage [Member] | Performing Financial Instruments [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2023 0  
2022 993  
2021 5,635  
2020 2,863  
2019 1,562  
Prior 28,520  
Revolving Loans 0  
Total 39,573  
Loans Receivable [Member] | Residential FirstLien Mortgage [Member] | Nonperforming Financial Instruments [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2023 0  
2022 0  
2021 0  
2020 0  
2019 0  
Prior 109  
Revolving Loans 0  
Total 109  
Loans Receivable [Member] | Home Equity Loan [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2023 1,045  
2022 38  
2021 319  
2020 4  
2019 0  
Prior 3,548  
Revolving Loans 2,906  
Total 7,860  
Loans Receivable [Member] | Home Equity Loan [Member] | Performing Financial Instruments [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2023 1,045  
2022 38  
2021 319  
2020 4  
2019 0  
Prior 3,548  
Revolving Loans 2,906  
Total 7,860  
Loans Receivable [Member] | Home Equity Loan [Member] | Nonperforming Financial Instruments [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2023 0  
2022 0  
2021 0  
2020 0  
2019 0  
Prior 0  
Revolving Loans 0  
Total 0  
Loans Receivable [Member] | Pass [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2023 51,117  
2022 246,822  
2021 216,279  
2020 73,689  
2019 187,719  
Prior 488,309  
Revolving Loans 226,661  
Total 1,490,596  
Loans Receivable [Member] | Pass [Member] | Commercial Real Estate [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2023 47,531  
2022 235,341  
2021 119,682  
2020 54,153  
2019 173,138  
Prior 428,018  
Revolving Loans 15,164  
Total 1,073,027  
Loans Receivable [Member] | Pass [Member] | Commercial And Industrial [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2023 1,749  
2022 6,041  
2021 1,143  
2020 1,987  
2019 8,019  
Prior 23,809  
Revolving Loans 6,564  
Total 49,312  
Loans Receivable [Member] | Pass [Member] | Construction Loans [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2023 792  
2022 4,409  
2021 89,500  
2020 14,682  
2019 5,000  
Prior 4,414  
Revolving Loans 202,027  
Total 320,824  
Loans Receivable [Member] | Special Mention [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2023 0  
2022 0  
2021 0  
2020 0  
2019 0  
Prior 3,462  
Revolving Loans 0  
Total 3,462  
Loans Receivable [Member] | Special Mention [Member] | Commercial Real Estate [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2023 0  
2022 0  
2021 0  
2020 0  
2019 0  
Prior 2,776  
Revolving Loans 0  
Total 2,776  
Loans Receivable [Member] | Special Mention [Member] | Commercial And Industrial [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2023 0  
2022 0  
2021 0  
2020 0  
2019 0  
Prior 686  
Revolving Loans 0  
Total 686  
Loans Receivable [Member] | Special Mention [Member] | Construction Loans [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2023 0  
2022 0  
2021 0  
2020 0  
2019 0  
Prior 0  
Revolving Loans 0  
Total 0  
Loans Receivable [Member] | Substandard [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2023 0  
2022 0  
2021 0  
2020 0  
2019 0  
Prior 6,753  
Revolving Loans 0  
Total 6,753  
Loans Receivable [Member] | Substandard [Member] | Commercial Real Estate [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2023 0  
2022 0  
2021 0  
2020 0  
2019 0  
Prior 4,485  
Revolving Loans 0  
Total 4,485  
Loans Receivable [Member] | Substandard [Member] | Commercial And Industrial [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2023 0  
2022 0  
2021 0  
2020 0  
2019 0  
Prior 2,159  
Revolving Loans 0  
Total 2,159  
Loans Receivable [Member] | Substandard [Member] | Construction Loans [Member]    
Financing Receivable, Credit Quality Indicator [Line Items]    
2023 0  
2022 0  
2021 0  
2020 0  
2019 0  
Prior 0  
Revolving Loans 0  
Total $ 0