XML 106 R83.htm IDEA: XBRL DOCUMENT v3.8.0.1
DEPOSITS (Additional Information) (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Banking and Thrift [Abstract]      
Demand Deposit Overdrafts Reclassified As Loan $ 2,000 $ 1,300  
Percentage of time deposits over total deposits 9.00%    
Interest expense on time deposits of $100,000 or more $ 4,500 3,200 $ 2,200
Time Deposits [Line Items]      
Total deposits 3,963,662 3,577,544  
Director and Executive Officer [Member]      
Time Deposits [Line Items]      
Total deposits $ 29,900 $ 26,700