Derivatives - Schedule of Notional Amounts of Outstanding Derivative Positions (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($)
CoBiz Statutory Trust I
Derivatives, statutory trusts
Notional amount of derivative instrument	$ 20,000
Fixed rate	4.99%
Termination date	Mar. 17, 2022
CoBiz Capital Trust II
Derivatives, statutory trusts
Notional amount of derivative instrument	$ 30,000
Fixed rate	5.99%
Termination date	Apr. 23, 2020
CoBiz Capital Trust III
Derivatives, statutory trusts
Notional amount of derivative instrument	$ 20,000
Fixed rate	5.02%
Termination date	Mar. 30, 2024