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DERIVATIVES - Additional Information (Detail)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
USD ($)
entity
Dec. 31, 2016
USD ($)
entity
Derivative [Line Items]    
Maximum derivative notional position as a percentage of assets 35.00%  
Maximum credit exposure as a percentage of capital 3.00%  
Maximum single counterparty credit risk exposure $ 20,000  
Number of counterparties | entity 13 10
Interest-bearing deposit swap $ 1,674,080 $ 1,354,056
Derivative Liability 12,687 12,587
Other Credit Derivatives [Member]    
Derivative [Line Items]    
Outstanding liability from counterparty contracts 100 200
Interest-bearing deposit swap 15,400 17,800
Interest Rate Lock Commitments [Member]    
Derivative [Line Items]    
Interest-bearing deposit swap 12,300 13,200
Credit Risk Contract [Member]    
Derivative [Line Items]    
Interest-bearing deposit swap 95,900 64,900
Derivative [Member] | Other Liabilities [Member]    
Derivative [Line Items]    
Interest-bearing deposit swap 837,500 677,800
Derivative Liability $ 1,300 $ 5,200