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LONG-TERM DEBT - Additional Information (Detail)
Dec. 31, 2015
USD ($)
bank
Dec. 31, 2014
USD ($)
Debt Disclosure [Abstract]    
Outstanding advance under lines and letters of credit $ 558,908,000  
Additional availability of borrowing capacity $ 284,203,000  
Number of correspondent banks | bank 2  
Available borrowing capacity of lines of credit $ 30,000,000  
Borrowings under lines of credit 0 $ 0
Letters of credit outstanding $ 10,150,000