Loans Receivable - Summary of Performance and Credit Quality of Loan Portfolio (Detail) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Financing Receivable Performance and Credit Quality Indicators [Line Items]
Current	$ 1,490,032	$ 1,364,634
Total loans receivable	1,500,864	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	1,017,930	867,380
Total loans receivable	1,022,954	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	43,745	28,859
Total loans receivable	46,022	28,859
Loans receivable more than 90 days and accruing	0	0
Construction [Member]
Financing Receivable Performance and Credit Quality Indicators [Line Items]
Current	380,690	417,390
Total loans receivable	383,615	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	39,638	41,715
Total loans receivable	40,244	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	8,029	9,290
Total loans receivable	8,029	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	1,079	1,547
30 to 59 Days Past Due [Member] | Commercial real estate [Member]
Financing Receivable Performance and Credit Quality Indicators [Line Items]
Total	539	0
30 to 59 Days Past Due [Member] | Commercial and industrial [Member]
Financing Receivable Performance and Credit Quality Indicators [Line Items]
Total	45	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	495	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	0	6,193
60 to 89 Days Past Due [Member] | Commercial real estate [Member]
Financing Receivable Performance and Credit Quality Indicators [Line Items]
Total	0	6,193
60 to 89 Days Past Due [Member] | Commercial and industrial [Member]
Financing Receivable Performance and Credit Quality Indicators [Line Items]
Total	0	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	0	0
60 to 89 Days Past Due [Member] | Home equity/consumer [Member]
Financing Receivable Performance and Credit Quality Indicators [Line Items]
Total	0	0
Greater than 90 Days [Member]
Financing Receivable Performance and Credit Quality Indicators [Line Items]
Total	9,753	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	2,232	0
Greater than 90 Days [Member] | Construction [Member]
Financing Receivable Performance and Credit Quality Indicators [Line Items]
Total	2,925	148
Greater than 90 Days [Member] | Residential first-lien mortgage [Member]
Financing Receivable Performance and Credit Quality Indicators [Line Items]
Total	111	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	10,832	8,190
Past Due [Member] | Commercial real estate [Member]
Financing Receivable Performance and Credit Quality Indicators [Line Items]
Total	5,024	6,193
Past Due [Member] | Commercial and industrial [Member]
Financing Receivable Performance and Credit Quality Indicators [Line Items]
Total	2,277	0
Past Due [Member] | Construction [Member]
Financing Receivable Performance and Credit Quality Indicators [Line Items]
Total	2,925	148
Past Due [Member] | Residential first-lien mortgage [Member]
Financing Receivable Performance and Credit Quality Indicators [Line Items]
Total	606	1,410
Past Due [Member] | Home equity/consumer [Member]
Financing Receivable Performance and Credit Quality Indicators [Line Items]
Total	$ 0	$ 439