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Junior subordinated debt (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Nov. 01, 2017
junior subordinated debentures [Line Items]        
Repayments of Subordinated Debt $ 8,248 $ 6,186 $ 0  
Junior Subordinated Notes $ 0 $ 8,248    
Pacific Continental [Member]        
junior subordinated debentures [Line Items]        
Business Combination, Purchase Price Allocation, Junior Subordinated Debentures       $ 14,434