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Junior Subordinated Debentures (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2007
May 01, 2014
Debt Instrument [Line Items]          
Issued amount       $ 25,000  
Debt term       30 years  
Adjustable rate of trust preferred securities 4.37%        
Junior subordinated debentures $ 20,302 $ 20,009      
Junior Subordinated Debentures          
Debt Instrument [Line Items]          
Weighted average rate 6.27% 5.11% 4.50%    
LIBOR          
Debt Instrument [Line Items]          
Basis spread on variable rate (as a percent)       1.56%  
Washington Banking          
Debt Instrument [Line Items]          
Assumed trust preferred securities and junior subordinated debentures, fair value         $ 18,900