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Business Combinations - Results of Operations of Acquired Business (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Business Acquisition [Line Items]                      
Interest income: Interest and fees on loans                 $ 175,466 $ 129,213 $ 122,147
Interest income: Interest and fees on investments                 17,602 12,688 11,215
Interest income: Other interest earning assets                 1,642 539 280
Interest expense $ (3,595) $ (3,480) $ (2,928) $ (2,410) $ (2,389) $ (2,333) $ (1,907) $ (1,717) (12,413) (8,346) (6,006)
Provision for loan losses for loans (1,162) (1,065) (1,750) (1,152) (1,338) (884) (1,131) (867) (5,129) (4,220) (4,931)
Noninterest income 8,464 8,080 7,573 7,548 9,064 8,443 10,709 7,363 31,665 35,579 31,619
Noninterest expense (37,345) (39,597) (35,706) (36,747) (27,588) (27,955) (27,809) (27,223) (149,395) (110,575) (106,473)
Income before income taxes $ 21,227 $ 18,514 $ 13,860 $ 10,486 $ 17,293 $ 14,546 $ 15,903 $ 12,405 64,087 $ 60,147 $ 52,721
Accretion of discount on purchased loans                 4,100    
Premier Merger                      
Business Acquisition [Line Items]                      
Interest income: Interest and fees on loans                 10,462    
Interest income: Interest and fees on investments                 76    
Interest income: Other interest earning assets                 174    
Interest expense                 (445)    
Provision for loan losses for loans                 (700)    
Noninterest income                 125    
Noninterest expense                 (7,558)    
Income before income taxes                 2,134    
Puget Sound Merger                      
Business Acquisition [Line Items]                      
Interest income: Interest and fees on loans                 21,898    
Interest income: Interest and fees on investments                 59    
Interest income: Other interest earning assets                 113    
Interest expense                 (682)    
Provision for loan losses for loans                 (850)    
Noninterest income                 472    
Noninterest expense                 (11,230)    
Income before income taxes                 9,780    
Premier and Puget Mergers                      
Business Acquisition [Line Items]                      
Interest income: Interest and fees on loans                 32,360    
Interest income: Interest and fees on investments                 135    
Interest income: Other interest earning assets                 287    
Interest expense                 (1,127)    
Provision for loan losses for loans                 (1,550)    
Noninterest income                 597    
Noninterest expense                 (18,788)    
Income before income taxes                 $ 11,914