Borrowings and Subordinated Debentures - Interest Rates and Maturity Dates of FHLB Secured Advances (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Rate	0.00%	0.00%
Borrowings	$ 0	$ 5,000
FHLB secured advances \| Federal Home Loan Bank of San Francisco
Debt Instrument [Line Items]
Balance	$ 0	$ 5,000
Rate	0.00%	0.00%
2020 \| Federal Home Loan Bank of San Francisco
Debt Instrument [Line Items]
Balance	$ 0	$ 5,000
2020 \| FHLB secured advances \| Federal Home Loan Bank of San Francisco
Debt Instrument [Line Items]
Short-term Debt, Percentage Bearing Fixed Interest Rate	0.00%	0.00%

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.

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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