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BUSINESS COMBINATION (Details)
$ in Thousands, shares in Millions
Nov. 01, 2018
USD ($)
shares
Jun. 30, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Business Acquisition [Line Items]        
Goodwill   $ 339,154 $ 339,154 $ 242,659
Nonaccretable difference   $ (6,200)    
Skagit Bank [Member]        
Business Acquisition [Line Items]        
Percentage of voting interest acquired 100.00%      
Number of branches acquired 11      
Shares transferred as consideration (in shares) | shares 3.1      
Total consideration paid $ 180,038      
Assets acquired 915,821      
Deposits recognized 810,200      
Loans receivable (contractual amount of $645.6 million) 632,374      
Core deposit intangible 16,368      
Goodwill $ 96,495      
Acquired intangible asset, useful life 9 years      
Unpaid principal balance on non-credit-impaired loans $ 637,400      
Fair value on non-credit-impaired loans 625,200      
Discount on acquired loans 12,200      
Credit related discount 7,900      
Contractually required principal and interest payments 9,897      
Nonaccretable difference (1,915)      
Cash flows expected to be collected 7,982      
Accretable yield (995)      
Fair value of PCI loans $ 6,987