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LOANS - Additional Information (Detail)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
USD ($)
loans
Dec. 31, 2019
USD ($)
loans
Dec. 31, 2018
USD ($)
loans
Dec. 31, 2017
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Number of Restructured Loans | loans 155 157 196  
Total restructured loans $ 21,800 $ 30,000 $ 38,500  
Restructured Loans, Accrual Status 7,100 11,400 16,100  
Restructured Loans, Nonaccrual Status 14,700 18,500 22,400  
Financing Receivable, Troubled Debt Restructuring, Commitment to Lend 300 2,500 0  
Restructured Loans, Allowance for Loan and Lease Losses Included in Reserves 8,800 2,500 1,500  
Restructured Loans, Portion Determined to be Uncollectible 1,700 2,600 900  
Accruing TDRs performing in accordance with restructured terms for more than one year 5,000 4,700 7,900  
Purchased impaired loans, carrying balance   68,664    
Real Estate Acquired Through Foreclosure 1,287 2,033 $ 1,401 $ 2,781
Commercial & industrial        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Purchased impaired loans, carrying balance   $ 3,081    
Paycheck Protection Program Amount of Funding 594,600      
Unearned fees $ 13,700