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LOANS - Troubled Debt Restructurings (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2018
USD ($)
contract
Mar. 31, 2017
contract
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Modifications that subsequently defaulted, number of contracts 0 2
Total commercial loans | Other    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Modifications that subsequently defaulted, number of contracts 1  
Modifications that subsequently defaulted, recorded investment | $ $ 113  
Commercial and industrial loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Modifications that subsequently defaulted, number of contracts 1  
Modifications that subsequently defaulted, recorded investment | $ $ 101