Basis of Presentation and Summary of Significant Accounting Policies (Details)	12 Months Ended
	Dec. 31, 2021 USD ($) Office segment item	Dec. 31, 2020 USD ($)
Schedule of Accounting Policies [Line Items]
Number of operating segments | segment	2
Maximum term to qualify as cash and cash equivalents	90 days
Cash and due from banks and interest-bearing deposits in excess of FDIC insured limits	$ 327,000	$ 17,000,000.0
FHLB investment requirement, capital stock amount	$ 2,500,000
FHLB investment requirement, percent of advances from FHLB	4.00%
Federal Home Loan Bank Stock	$ 4,778,000	7,439,000
Impairment of FHLB stock	$ 0	0
Minimum term for accrual of interest on loans to be discontinued	90 days
Minimum term delinquent loan performs under contract terms and returned to accrual status	6 months
Cash on hand and deposit balances with FRB	$ 0	0
Marketing and advertising	634,000	530,000
Goodwill, Impairment Loss	$ 0	$ 0
Minimum | ASU No 2016-13
Schedule of Accounting Policies [Line Items]
Decrease in allowance for credit losses (as a percent)	1.00%
Maximum | ASU No 2016-13
Schedule of Accounting Policies [Line Items]
Decrease in allowance for credit losses (as a percent)	5.00%
Building and building improvements | Minimum
Schedule of Accounting Policies [Line Items]
Useful life	25 years
Building and building improvements | Maximum
Schedule of Accounting Policies [Line Items]
Useful life	40 years
Furniture, fixtures and equipment | Minimum
Schedule of Accounting Policies [Line Items]
Useful life	3 years
Furniture, fixtures and equipment | Maximum
Schedule of Accounting Policies [Line Items]
Useful life	10 years
Puget Sound
Schedule of Accounting Policies [Line Items]
Number of bank branches | item	21
Number of administrative offices that originates loans and accept deposits | Office	1
Number of loan production offices | Office	10
Tri-Cities, Washington
Schedule of Accounting Policies [Line Items]
Number of loan production offices | Office	1
Anchor Bancorp
Schedule of Accounting Policies [Line Items]
Minimum term for accrual of interest on loans to be discontinued	90 days