Borrowings, FHLB Stock and Subordinated Notes (Details) - USD ($)	1 Months Ended	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2022	Dec. 31, 2021
Short-term Debt [Line Items]
Loans used as collateral for credit facility		$ 853,202,000	$ 687,868,000
Investment in FHLB stock		2,897,000	1,046,000
Subordinated notes, net		11,665,000	11,634,000
Subordinated Debt
Short-term Debt [Line Items]
Aggregate principal amount	$ 12,000,000
Subordinated notes, net		11,700,000	11,600,000
Subordinated Debt | Period before October 1, 2025
Short-term Debt [Line Items]
Interest rate	5.25%
Subordinated Debt | Period after October 1, 2025
Short-term Debt [Line Items]
Incremental term	3 months
Subordinated Debt | Period after October 1, 2025 | SOFR
Short-term Debt [Line Items]
Basis spread on variable rate	5.13%
Federal Reserve Bank of San Francisco
Short-term Debt [Line Items]
Outstanding borrowings		0	0
Line of Credit | Pacific Coast Banker's Bank
Short-term Debt [Line Items]
Amount available to borrow under loan agreement		$ 20,000,000
Term period		1 year
Outstanding borrowings		$ 0	0
Asset Pledged as Collateral | Federal Reserve Bank of San Francisco
Short-term Debt [Line Items]
Amount available to borrow under loan agreement		21,200,000	22,400,000
FHLB
Short-term Debt [Line Items]
Amount available to borrow under loan agreement		421,800,000	417,700,000
Outstanding borrowings		44,500,000	0
FHLB | Letter of Credit
Short-term Debt [Line Items]
Letters of credit to secure public deposits		13,000,000	11,500,000
Net remaining amount available		180,900,000	101,500,000
FHLB | Collateralized | One-to-four family
Short-term Debt [Line Items]
Loans used as collateral for credit facility		190,800,000	59,700,000
FHLB | Collateralized | Commercial and multifamily
Short-term Debt [Line Items]
Loans used as collateral for credit facility		47,100,000	52,900,000
FHLB | Collateralized | Home equity
Short-term Debt [Line Items]
Loans used as collateral for credit facility		$ 516,000	$ 482,000