Loans Receivable and Allowance for Credit Losses - Loans Modified, Aging Analysis (Details) $ in Thousands	Sep. 30, 2023 USD ($)
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing receivable modified in period, amount	$ 8,595
Financial Asset, Not Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing receivable modified in period, amount	3,355
30-59 Days
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing receivable modified in period, amount	0
60-89 Days
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing receivable modified in period, amount	5,000
90 Days or More
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing receivable modified in period, amount	0
Non-accrual
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing receivable modified in period, amount	240
Real estate loans | Commercial real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing receivable modified in period, amount	1,038
Real estate loans | Commercial real estate | Financial Asset, Not Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing receivable modified in period, amount	1,038
Real estate loans | Commercial real estate | 30-59 Days
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing receivable modified in period, amount	0
Real estate loans | Commercial real estate | 60-89 Days
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing receivable modified in period, amount	0
Real estate loans | Commercial real estate | 90 Days or More
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing receivable modified in period, amount	0
Real estate loans | Commercial real estate | Non-accrual
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing receivable modified in period, amount	0
Real estate loans | Construction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing receivable modified in period, amount	2,317
Real estate loans | Construction | Financial Asset, Not Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing receivable modified in period, amount	2,317
Real estate loans | Construction | 30-59 Days
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing receivable modified in period, amount	0
Real estate loans | Construction | 60-89 Days
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing receivable modified in period, amount	0
Real estate loans | Construction | 90 Days or More
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing receivable modified in period, amount	0
Real estate loans | Construction | Non-accrual
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing receivable modified in period, amount	0
Commercial business loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing receivable modified in period, amount	5,240
Commercial business loans | Financial Asset, Not Past Due
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing receivable modified in period, amount	0
Commercial business loans | 30-59 Days
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing receivable modified in period, amount	0
Commercial business loans | 60-89 Days
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing receivable modified in period, amount	5,000
Commercial business loans | 90 Days or More
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing receivable modified in period, amount	0
Commercial business loans | Non-accrual
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing receivable modified in period, amount	$ 240