Business Combinations and Asset Acquisitions - acquisition-related expenses (Details) - Bank of Commerce - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Asset Acquisition [Line Items]
Business Combination, Acquisition Related Costs	$ 568	$ 2,192	$ 4,904	$ 2,702
Compensation and employee benefits
Asset Acquisition [Line Items]
Business Combination, Acquisition Related Costs	205	0	1,144	0
Occupancy
Asset Acquisition [Line Items]
Business Combination, Acquisition Related Costs	8	0	928	0
Data processing and software
Asset Acquisition [Line Items]
Business Combination, Acquisition Related Costs	219	1	1,640	1
Legal and professional fees
Asset Acquisition [Line Items]
Business Combination, Acquisition Related Costs	133	2,153	378	2,663
Advertising and promotion
Asset Acquisition [Line Items]
Business Combination, Acquisition Related Costs	0	0	18	0
Other noninterest expenses
Asset Acquisition [Line Items]
Business Combination, Acquisition Related Costs	$ 3	$ 38	$ 796	$ 38