Borrowing Arrangements (Details) - USD ($)	Sep. 30, 2023	Dec. 31, 2022
Borrowing Arrangements
Investments securing FHLB advances, amortized cost	$ 694,732,000	$ 740,468,000
Debt Securities, Available-for-sale	593,430,000	648,825,000
Federal funds purchased	0	0
Letter of Credit \| Unsecured Credit Lines
Borrowing Arrangements
Line of Credit Facility, Maximum Borrowing Capacity	110,000,000	110,000,000
Letters of Credit Outstanding, Amount	0	0
Letter of Credit \| Federal Home Loan Bank Borrowings
Borrowing Arrangements
Line of Credit Facility, Maximum Borrowing Capacity	340,197,000	319,309,000
Letters of Credit Outstanding, Amount	0	46,000,000
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged	596,523,000	687,357,000
Securities Held as Collateral, at Fair Value	497,968,000	565,869,000
Letter of Credit \| Federal Reserve Bank Term Loan Funding Program
Borrowing Arrangements
Line of Credit Facility, Maximum Borrowing Capacity	37,245,000	0
Letters of Credit Outstanding, Amount	0	0
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged	54,380,000	0
Securities Held as Collateral, at Fair Value	46,281,000	0
Letter of Credit \| Federal Reserve Bank
Borrowing Arrangements
Line of Credit Facility, Maximum Borrowing Capacity	4,242,000	4,702,000
Letters of Credit Outstanding, Amount	0	0
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged	5,073,000	5,508,000
Securities Held as Collateral, at Fair Value	4,306,000	4,893,000
Federal Home Loan Bank Advances
Borrowing Arrangements
Remaining borrowing capacity	340,197,000
Investments securing FHLB advances, amortized cost	20,739,000
Federal Home Loan Bank Advances \| Asset Pledged as Collateral
Borrowing Arrangements
Debt Securities	575,783,000
San Fransisco Branch
Borrowing Arrangements
Advances from FHLB	$ 0	$ 46,000,000

Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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