Loans Receivable and Allowance for Credit Losses - Loans Modified (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2023
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing receivable modified in period, amount	$ 6,038	$ 8,595
% of Total Class of Loans Receivable	0.10%	0.10%
Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing receivable modified in period, amount	$ 1,038	$ 3,595
Extended Marurity, Interest Rate Reduction and Payment Deferral
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing receivable modified in period, amount	5,000	5,000
Real estate loans | Construction
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing receivable modified in period, amount		$ 2,317
% of Total Class of Loans Receivable		0.60%
Financing receivable, term extension		12 months
Real estate loans | Construction | Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing receivable modified in period, amount		$ 2,317
Real estate loans | Construction | Extended Marurity, Interest Rate Reduction and Payment Deferral
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing receivable modified in period, amount		0
Real estate loans | Commercial real estate
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing receivable modified in period, amount	$ 1,038	$ 1,038
% of Total Class of Loans Receivable	0.00%	0.00%
Financing receivable, term extension	12 months	12 months
Real estate loans | Commercial real estate | Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing receivable modified in period, amount	$ 1,038	$ 1,038
Real estate loans | Commercial real estate | Extended Marurity, Interest Rate Reduction and Payment Deferral
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing receivable modified in period, amount	0	0
Commercial business loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing receivable modified in period, amount	$ 5,000	$ 5,240
% of Total Class of Loans Receivable	0.90%	1.00%
Financing receivable, term extension	12 months	12 months
Commercial business loans | Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing receivable modified in period, amount	$ 0	$ 240
Commercial business loans | Extended Marurity, Interest Rate Reduction and Payment Deferral
Financing Receivable, Troubled Debt Restructuring [Line Items]
Financing receivable modified in period, amount	$ 5,000	$ 5,000