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Business Combinations - Net Effect of Acquisition (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Oct. 01, 2018
Dec. 31, 2018
Dec. 31, 2017
Sep. 30, 2018
Business Acquisition [Line Items]        
Interest income: Interest and fees on loans   $ 11,782 $ 9,328  
Interest expense   (971) (601)  
Non-interest income   3,266 3,137  
Non-interest expense   (8,562) (7,176)  
Accretion of discount on purchased loans   (87) 0  
South Sound Merger        
Business Acquisition [Line Items]        
Interest income: Interest and fees on loans   1,738    
Interest income: Interest and dividends on investment securities and FHLB stock   201    
Interest income: Other interest earning assets   100    
Interest expense   (128)    
Provision for loan losses   0    
Non-interest income   139    
Non-interest expense   (860)    
Net effect, pre-tax   1,190    
Acquisition related costs $ 64 64 $ 41 $ 616
Accretion of discount on purchased loans   $ 87