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Junior Subordinated Debentures (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
May 01, 2014
Debt Instrument [Line Items]            
Junior subordinated debentures $ 20,814   $ 20,814   $ 20,595  
Adjustable rate of trust preferred securities 1.79%   1.79%      
Junior Subordinated Debentures            
Debt Instrument [Line Items]            
Weighted average rate 3.75% 6.43% 4.51% 6.72%    
Washington Banking            
Debt Instrument [Line Items]            
Assumed trust preferred securities and junior subordinated debentures, fair value           $ 18,900