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BUSINESS COMBINATION- Business Combination (Detail) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Feb. 27, 2015
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Assets [Abstract]        
Fair Value Of Assets Acquired $ 540,339      
Liabilities [Abstract]        
Business Combination Bargain Purchase Gain Recognized Amount 13,443 $ 0 $ 0 $ 13,443
Deposits [Member]        
Liabilities [Abstract]        
Liabilities Assumed1 523,517 0 0 523,517
Other Liabilities [Member]        
Liabilities [Abstract]        
Liabilities Assumed1 3,379      
Core Deposits [Member]        
Assets [Abstract]        
Fair Value Of Assets Acquired 5,820 0 0 5,820
Property Plant And Equipment [Member]        
Assets [Abstract]        
Fair Value Of Assets Acquired 5,450 0 0 5,450
Cash [Member]        
Assets [Abstract]        
Fair Value Of Assets Acquired 217,659      
Loans [Member]        
Assets [Abstract]        
Fair Value Of Assets Acquired $ 311,410 $ 0 $ 0 $ 311,410