Loans Receivable and Allowance for Credit Losses - Narrative (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2023 USD ($)	Jun. 30, 2022 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2022 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021	Oct. 01, 2021	Jan. 01, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans purchased			$ 16,443,000	$ 98,720,000
Loans receivable, gross	$ 930,734,000		$ 930,734,000		$ 848,316,000
Maximum period of credit extension			18 months
Loans receivable, term to reset to FHLB rate			5 years
Period for charged off of open-end credits			180 days
Period for charged off of close-end credits			90 days
Interest lost on nonaccrual loans	$ 133,000	$ 115,000	$ 268,000	221,000
Maximum period for charged off of consumer installment loans			180 days
Number of contract modifications	0	0
Discount to appraisal value	5.80%		5.80%
Discount of appraisal value, selling costs	8.00%		8.00%
Unfunded Loan Commitment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit loss	$ 1,495,000		$ 1,495,000
SBA Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	32,800,000		32,800,000		32,500,000
Percentage of principal balance guaranteed						75.00%	75.00%	90.00%
Transfer of loans held-for-sale to portfolio loans	0	$ 0	0	0
SBA CARES Act Paycheck Protection Program
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	135,000		135,000		157,000
Syndicated and Leveraged Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	5,800,000		5,800,000		5,800,000
Non-Accrual Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Impaired financing receivable, interest income, cash basis	193,000	114,000	$ 336,000	204,000
Commercial Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Maximum percentage of credit extension based on market value of collateral			75.00%
Loans purchased	0	0	$ 0	20,700,000
Loans receivable, gross	511,655,000		$ 511,655,000		437,443,000
Multi-family Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Maximum percentage of credit extension based on market value of collateral			80.00%
Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of maximum loan to value			75.00%
Loans receivable, gross	5,525,000		$ 5,525,000		4,922,000
Residential Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans purchased	0	0	0	0
Loans receivable, gross	116,454,000		116,454,000		124,140,000
Consumer and Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	123,063,000		$ 123,063,000		141,091,000
Consumer and Other | Minimum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable term			2 years
Consumer and Other | Maximum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable term			5 years
Consumer and Other | Unsecured Consumer Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	68,300,000		$ 68,300,000		78,900,000
Consumer and Other | Unsecured Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans purchased	4,300,000	32,000,000	13,600,000	50,400,000
Consumer and Other | Home equity lines of credit
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans purchased	1,500,000	$ 27,700,000	1,500,000	$ 27,700,000
Construction to Permanent - CRE
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable, gross	$ 2,463,000		$ 2,463,000		$ 1,933,000
Construction to Permanent - CRE | Minimum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable term			20 years
Construction to Permanent - CRE | Maximum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans receivable term			25 years