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Borrowings and Other Obligations - Lines of Credit and Borrowing Agreements (Details) - USD ($)	Dec. 31, 2021	Aug. 06, 2021	Dec. 31, 2020
Federal Home Loan Bank Overnight Borrowings
Line of Credit Facility [Line Items]
Amount of FHLB borrowings outstanding	$ 0		$ 0
Line of Credit | Federal Home Loan Bank
Line of Credit Facility [Line Items]
Lines of credit	820,500,000		642,500,000
Line of Credit | Federal Home Loan Bank Borrowings | American River Bank ARB
Line of Credit Facility [Line Items]
Lines of credit		$ 13,900,000
Line of Credit | Federal Funds Purchased
Line of Credit Facility [Line Items]
Lines of credit	150,000,000.0		135,000,000.0
Short-term Debt	0		0
Line of Credit | Federal Reserve Line of Credit
Line of Credit Facility [Line Items]
Lines of credit	70,800,000		78,700,000
Amount of FHLB borrowings outstanding	$ 0		$ 0

X

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions 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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X

- Definition

Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

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X

- Definition

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.

+ References

No definition available.

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- Definition

Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

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