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LOANS - Additional Information (Detail)
 12 Months Ended
Dec. 31, 2019
USD ($)
loans
Dec. 31, 2018
USD ($)
loans
Dec. 31, 2017
USD ($)
loans
Dec. 31, 2016
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Number of Restructured Loans | loans 157 196 214  
Total restructured loans $ 30,000,000.0 $ 38,500,000 $ 23,900,000  
Restructured Loans, Accrual Status 11,435,000 16,109,000 17,545,000  
Restructured Loans, Nonaccrual Status 18,500,000 22,400,000 6,400,000  
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend 2,500,000 0 0  
Restructured Loans, Allowance for Loan and Lease Losses Included in Reserves 2,500,000 1,500,000 1,300,000  
Restructured Loans, Portion Determined to be Uncollectible 2,600,000 900,000 300,000  
Accruing TDRs performing in accordance with restructured terms for more than one year 4,700,000 7,900,000 17,200,000  
Purchased impaired loans, carrying balance 68,664,000 96,320,000    
Real Estate Acquired Through Foreclosure 2,033,000 $ 1,401,000 $ 2,781,000 $ 6,284,000
Residential real estate        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Restructured Loans, Loan Relationships, Review Threshold Amount Minimum $ 250,000