Junior and Other Subordinated Debentures (Narrative) (Details) - USD ($) $ in Thousands		12 Months Ended
	Feb. 28, 2023	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Junior Subordinated Debentures [Line Items]
Junior and other subordinated debentures, at amortized cost		$ 107,895	$ 87,813
Common stock issued by Trusts		14,300	14,000
Unrealized gains (losses) arising during the period		7,866	$ (28,842)	$ (37,899)
Other Subordinated Debt
Junior Subordinated Debentures [Line Items]
Junior and other subordinated debentures, at amortized cost	$ 10,000
Basis spread on SOFR+0.26161%	5.26%
Junior Subordinated Debt, at Amortized Cost
Junior Subordinated Debentures [Line Items]
Junior and other subordinated debentures, at amortized cost		97,895
Junior Subordinated Debt, at Amortized Cost | Bank of Commerce Holdings Trust II
Junior Subordinated Debentures [Line Items]
Junior and other subordinated debentures, at amortized cost	$ 10,300	$ 10,310
Basis spread on SOFR+0.26161%		1.58%