Subordinated debentures (Details) - Narrative - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2022	Oct. 01, 2021
Bank of Commerce \| Subordinated Debt
Subordinated Borrowing [Line Items]
Business Combination, Purchase Price Allocation, Junior Subordinated Debt		$ 10.0
Subordinated Debt
Subordinated Borrowing [Line Items]
Debt Instrument, Interest Rate Terms	5.26%

Face (par) amount of debt instrument at time of issuance.

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Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant