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LOANS - Additional Information (Detail)
 12 Months Ended
Dec. 31, 2017
USD ($)
loans
Dec. 31, 2016
USD ($)
loans
Dec. 31, 2015
USD ($)
loans
Dec. 31, 2014
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Indemnification valuation adjustment $ (5,100,000)      
Accruing TDRs performing in accordance with restructured terms for more than one year 17,200,000 $ 22,600,000 $ 10,300,000  
Restructured Loans, Accrual Status 17,500,000 30,200,000 28,900,000  
Purchased impaired loans, carrying balance $ 104,960,000 138,049,000    
Loans, Federal Deposit Insurance Corporation Reimbursement Percentage on Losses Below Threshold 80.00%      
Loans, Federal Deposit Insurance Corporation Reimbursement Percentage on Losses Above Threshold 95.00%      
Restructured Loans, Nonaccrual Status $ 6,400,000 5,100,000 9,300,000  
Restructured Loans, Allowance for Loan and Lease Losses Included in Reserves 1,300,000 1,900,000 6,300,000  
Gain (loss) on sale of other real estate owned (642,000) 1,212,000 (1,861,000)  
Real Estate Acquired Through Foreclosure 2,781,000 6,284,000 13,254,000 $ 22,674,000
Loans and Leases Receivable, Impaired, Commitment to Lend   900,000 1,800,000  
Restructured Loans, Portion Determined to be Uncollectible $ 300,000 $ 500,000 $ 2,700,000  
Number of Restructured Loans | loans 214 247 271  
Total restructured loans $ 23,900,000 $ 35,400,000 $ 38,200,000  
Residential real estate        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Restructured Loans, Loan Relationships, Review Threshold Amount Minimum $ 250,000