Borrowing Arrangements (Details) - USD ($)	Dec. 31, 2019	Dec. 31, 2018
Borrowing Arrangements
Investments securing FHLB advances, amortized cost	$ 466,747,000	$ 470,162,000
Available-for-sale debt securities	470,746,000	463,905,000
Maximum borrowing capacity on lines of credit	70,000,000	40,000,000
Federal funds purchased	0
Available-for-sale investment securities	470,746,000	463,905,000
Federal Home Loan Bank Advances
Borrowing Arrangements
Loans pledged as collateral	446,494,000
Remaining borrowing capacity	304,987,000
Federal Home Loan Bank Advances \| Securities Pledged as Collateral
Borrowing Arrangements
Investments securing FHLB advances, amortized cost	248,000	326,000
Available-for-sale debt securities	256,000	337,000
Federal Reserve Bank Advances
Borrowing Arrangements
Line of credit, current	4,931,000	4,364,000
Federal Reserve Bank Advances \| Securities Pledged as Collateral
Borrowing Arrangements
Investments securing FHLB advances, amortized cost	5,065,000	4,498,000
Available-for-sale investment securities	5,036,000	4,475,000
San Francisco Branch
Borrowing Arrangements
Advances from FHLB	$ 0
Federal Home Loan Bank of San Francisco [Member]
Borrowing Arrangements
Advances from FHLB		$ 10,000,000

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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Amount of short term borrowing where a bank borrows, at the federal funds rate, from another bank.

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Amount of advances from the Federal Home Loan Bank (FHLB).

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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The carrying value as of the balance sheet date of the current portion of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Carrying amount as of the balance sheet date of loans that have been pledged as collateral for borrowings. If the secured party has the right by contract or custom to sell or re-pledge the collateral, then the debtor reclassifies that asset and report that asset in its statement of financial position separately from other assets not so encumbered.

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