Loans Receivable, Net and Allowance for Credit Losses on Loans - Schedule of Performing or Non-Performing Loans (Detail) - Consumer Portfolio Segment [Member] $ in Thousands	Sep. 30, 2023 USD ($)
Financing Receivable, Recorded Investment [Line Items]
Total	$ 780,831
Home Equity Loans and Lines of Credit [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	48,212
Auto Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	523
Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	2,002
Performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	778,185
Performing [Member] | Home Equity Loans and Lines of Credit [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	48,165
Performing [Member] | Auto Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	523
Performing [Member] | Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	1,972
Non-performing [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	2,646
Non-performing [Member] | Home Equity Loans and Lines of Credit [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	47
Non-performing [Member] | Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	30
Residential [Member] | Real Estate Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	713,326
Residential [Member] | Performing [Member] | Real Estate Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	710,757
Residential [Member] | Non-performing [Member] | Real Estate Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	2,569
Construction [Member] | Real Estate Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	16,768
Construction [Member] | Performing [Member] | Real Estate Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Total	$ 16,768