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ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING AND REPORTING POLICIES - Goodwill and Other Intangibles (Details) - Core Deposit Intangibles
12 Months Ended
Dec. 31, 2017
Minimum  
Goodwill and other intangibles  
Useful life 6 years
Maximum  
Goodwill and other intangibles  
Useful life 19 years