Subordinated debentures (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Nov. 01, 2017
Subordinated Borrowing [Line Items]
Subordinated Borrowing, Interest Rate	5.875%
Pacific Continental [Member]
Subordinated Borrowing [Line Items]
Business Combination, Purchase Price Allocation, Subordinated Debt		$ 35.0
Subordinated Debt [Member]
Subordinated Borrowing [Line Items]
Debt Instrument, Basis Spread on Variable Rate	4.715%