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Loans Receivable - Summary of Performance and Credit Quality of Loan Portfolio (Detail) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Financing Receivable Performance and Credit Quality Indicators [Line Items]    
Current $ 1,491,077 $ 1,364,634
Total loans receivable 1,500,811 1,372,824
Loans receivable more than 90 days and accruing 0 184
Commercial real estate [Member]    
Financing Receivable Performance and Credit Quality Indicators [Line Items]    
Current 1,072,392 867,380
Total loans receivable 1,080,288 873,573
Loans receivable more than 90 days and accruing 0 0
Commercial and industrial [Member]    
Financing Receivable Performance and Credit Quality Indicators [Line Items]    
Current 50,506 28,859
Total loans receivable 52,157 28,859
Loans receivable more than 90 days and accruing 0 0
Construction [Member]    
Financing Receivable Performance and Credit Quality Indicators [Line Items]    
Current 320,824 417,390
Total loans receivable 320,824 417,538
Loans receivable more than 90 days and accruing 0 0
Residential first-lien mortgage [Member]    
Financing Receivable Performance and Credit Quality Indicators [Line Items]    
Current 39,542 41,715
Total loans receivable 39,682 43,125
Loans receivable more than 90 days and accruing 0 0
Home equity/consumer [Member]    
Financing Receivable Performance and Credit Quality Indicators [Line Items]    
Current 7,813 9,290
Total loans receivable 7,860 9,729
Loans receivable more than 90 days and accruing 0 184
30 to 59 Days Past Due [Member]    
Financing Receivable Performance and Credit Quality Indicators [Line Items]    
Total 186 1,547
30 to 59 Days Past Due [Member] | Commercial real estate [Member]    
Financing Receivable Performance and Credit Quality Indicators [Line Items]    
Total 152 0
30 to 59 Days Past Due [Member] | Commercial and industrial [Member]    
Financing Receivable Performance and Credit Quality Indicators [Line Items]    
Total 34 0
30 to 59 Days Past Due [Member] | Construction [Member]    
Financing Receivable Performance and Credit Quality Indicators [Line Items]    
Total 0 0
30 to 59 Days Past Due [Member] | Residential first-lien mortgage [Member]    
Financing Receivable Performance and Credit Quality Indicators [Line Items]    
Total 0 1,292
30 to 59 Days Past Due [Member] | Home equity/consumer [Member]    
Financing Receivable Performance and Credit Quality Indicators [Line Items]    
Total 0 255
60 to 89 Days Past Due [Member]    
Financing Receivable Performance and Credit Quality Indicators [Line Items]    
Total 2,795 6,193
60 to 89 Days Past Due [Member] | Commercial real estate [Member]    
Financing Receivable Performance and Credit Quality Indicators [Line Items]    
Total 1,844 6,193
60 to 89 Days Past Due [Member] | Commercial and industrial [Member]    
Financing Receivable Performance and Credit Quality Indicators [Line Items]    
Total 873 0
60 to 89 Days Past Due [Member] | Construction [Member]    
Financing Receivable Performance and Credit Quality Indicators [Line Items]    
Total 0 0
60 to 89 Days Past Due [Member] | Residential first-lien mortgage [Member]    
Financing Receivable Performance and Credit Quality Indicators [Line Items]    
Total 31 0
60 to 89 Days Past Due [Member] | Home equity/consumer [Member]    
Financing Receivable Performance and Credit Quality Indicators [Line Items]    
Total 47 0
Greater than 90 Days [Member]    
Financing Receivable Performance and Credit Quality Indicators [Line Items]    
Total 6,753 450
Greater than 90 Days [Member] | Commercial real estate [Member]    
Financing Receivable Performance and Credit Quality Indicators [Line Items]    
Total 4,485 0
Greater than 90 Days [Member] | Commercial and industrial [Member]    
Financing Receivable Performance and Credit Quality Indicators [Line Items]    
Total 2,159 0
Greater than 90 Days [Member] | Construction [Member]    
Financing Receivable Performance and Credit Quality Indicators [Line Items]    
Total 0 148
Greater than 90 Days [Member] | Residential first-lien mortgage [Member]    
Financing Receivable Performance and Credit Quality Indicators [Line Items]    
Total 109 118
Greater than 90 Days [Member] | Home equity/consumer [Member]    
Financing Receivable Performance and Credit Quality Indicators [Line Items]    
Total 0 184
Past Due [Member]    
Financing Receivable Performance and Credit Quality Indicators [Line Items]    
Total 9,734 8,190
Past Due [Member] | Commercial real estate [Member]    
Financing Receivable Performance and Credit Quality Indicators [Line Items]    
Total 7,896 6,193
Past Due [Member] | Commercial and industrial [Member]    
Financing Receivable Performance and Credit Quality Indicators [Line Items]    
Total 1,651 0
Past Due [Member] | Construction [Member]    
Financing Receivable Performance and Credit Quality Indicators [Line Items]    
Total 0 148
Past Due [Member] | Residential first-lien mortgage [Member]    
Financing Receivable Performance and Credit Quality Indicators [Line Items]    
Total 140 1,410
Past Due [Member] | Home equity/consumer [Member]    
Financing Receivable Performance and Credit Quality Indicators [Line Items]    
Total $ 47 $ 439