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Borrowings and Other Obligations - Lines of Credit and Borrowing Agreements (Details) - Line of Credit - USD ($) | Feb. 28, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Aug. 06, 2021 | Dec. 31, 2020
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Federal Home Loan Bank Borrowings |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Lines of credit |  | $ 599,600,000 |  |  |
Federal Home Loan Bank |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Amount of FHLB borrowings outstanding |  | 711,600,000 | $ 820,500,000 |  |
Total borrowing capacity |  | 711,600,000 |  |  |
Federal Home Loan Bank | Subsequent event |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Total borrowing capacity | $ 1,037,200,000.0000 |  |  |  |
Federal Home Loan Bank Borrowings |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Overnight borrowings |  | 112,000,000 | 0 |  |
Federal Home Loan Bank Borrowings | American River Bank ARB |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Lines of credit |  |  |  | $ 13,900,000 |
Federal Funds Purchased |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Lines of credit |  | 150,000,000.0 | 150,000,000.0 |  |
Overnight borrowings |  | 0 | 0 |  |
Federal Home Loan Bank Borrowings |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Amount of FHLB borrowings outstanding |  | $ 112,000,000 | $ 0 |  | $ 0
Average interest rate |  | 4.48% | 0.00% |  | 0.75%
Federal Home Loan Bank Borrowings | Federal Home Loan Bank Borrowings |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Average interest rate |  | 4.65% |  |  |
Federal Reserve Line of Credit |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Lines of credit |  | $ 58,700,000 | $ 70,800,000 |  |
Amount of FHLB borrowings outstanding |  | $ 0 | $ 0 |  |

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- 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI https://asc.fasb.org/extlink&oid=126897435&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI https://asc.fasb.org/extlink&oid=126734703&loc=d3e572229-122910 + Details
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- 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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