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Loans Receivable - Summary of Performance and Credit Quality of Loan Portfolio (Detail) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Financing Receivable Performance and Credit Quality Indicators [Line Items]    
Current $ 1,769,533 $ 1,794,582
Total Loans Receivable 1,796,142 1,821,274
Loans receivable more than 90 days and accruing 0 32
Commercial real estate [Member]    
Financing Receivable Performance and Credit Quality Indicators [Line Items]    
Current 1,329,908 1,359,644
Total Loans Receivable 1,353,039 1,385,085
Loans receivable more than 90 days and accruing 0 0
Commercial and industrial [Member]    
Financing Receivable Performance and Credit Quality Indicators [Line Items]    
Current 79,821 92,400
Total Loans Receivable 81,370 92,857
Loans receivable more than 90 days and accruing 0 32
Construction [Member]    
Financing Receivable Performance and Credit Quality Indicators [Line Items]    
Current 203,004 257,169
Total Loans Receivable 203,004 257,169
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 134,001 67,236
Total Loans Receivable 135,930 68,030
Loans receivable more than 90 days and accruing 0 0
Home equity/consumer [Member]    
Financing Receivable Performance and Credit Quality Indicators [Line Items]    
Current 22,799 18,133
Total Loans Receivable 22,799 18,133
Loans receivable more than 90 days and accruing 0 0
30 to 59 Days Past Due [Member]    
Financing Receivable Performance and Credit Quality Indicators [Line Items]    
Total 7,979 736
30 to 59 Days Past Due [Member] | Commercial real estate [Member]    
Financing Receivable Performance and Credit Quality Indicators [Line Items]    
Total 6,026 0
30 to 59 Days Past Due [Member] | Commercial and industrial [Member]    
Financing Receivable Performance and Credit Quality Indicators [Line Items]    
Total 248 36
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 1,705 700
30 to 59 Days Past Due [Member] | Home equity/consumer [Member]    
Financing Receivable Performance and Credit Quality Indicators [Line Items]    
Total 0 0
60 to 89 Days Past Due [Member]    
Financing Receivable Performance and Credit Quality Indicators [Line Items]    
Total 1,920 94
60 to 89 Days Past Due [Member] | Commercial real estate [Member]    
Financing Receivable Performance and Credit Quality Indicators [Line Items]    
Total 1,820 0
60 to 89 Days Past Due [Member] | Commercial and industrial [Member]    
Financing Receivable Performance and Credit Quality Indicators [Line Items]    
Total 16 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 84 94
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 16,710 25,862
Greater than 90 Days [Member] | Commercial real estate [Member]    
Financing Receivable Performance and Credit Quality Indicators [Line Items]    
Total 15,285 25,441
Greater than 90 Days [Member] | Commercial and industrial [Member]    
Financing Receivable Performance and Credit Quality Indicators [Line Items]    
Total 1,285 421
Greater than 90 Days [Member] | Construction [Member]    
Financing Receivable Performance and Credit Quality Indicators [Line Items]    
Total 0 0
Greater than 90 Days [Member] | Residential first-lien mortgage [Member]    
Financing Receivable Performance and Credit Quality Indicators [Line Items]    
Total 140 0
Greater than 90 Days [Member] | Home equity/consumer [Member]    
Financing Receivable Performance and Credit Quality Indicators [Line Items]    
Total 0 0
Past Due [Member]    
Financing Receivable Performance and Credit Quality Indicators [Line Items]    
Total 26,609 26,692
Past Due [Member] | Commercial real estate [Member]    
Financing Receivable Performance and Credit Quality Indicators [Line Items]    
Total 23,131 25,441
Past Due [Member] | Commercial and industrial [Member]    
Financing Receivable Performance and Credit Quality Indicators [Line Items]    
Total 1,549 457
Past Due [Member] | Construction [Member]    
Financing Receivable Performance and Credit Quality Indicators [Line Items]    
Total 0 0
Past Due [Member] | Residential first-lien mortgage [Member]    
Financing Receivable Performance and Credit Quality Indicators [Line Items]    
Total 1,929 794
Past Due [Member] | Home equity/consumer [Member]    
Financing Receivable Performance and Credit Quality Indicators [Line Items]    
Total $ 0 $ 0