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OTHER INVESTMENT SECURITIES - Additional Information (Detail) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Jan. 01, 2018
Dec. 31, 2017
Summary of Investment Holdings [Line Items]            
Capital stock par value $ 100   $ 100      
Book value of investment in FHLB stock $ 39,700,000   $ 39,700,000     $ 40,900,000
Market-to-market losses 6,898,000 $ 6,963,000 23,271,000 $ 22,118,000    
Equity Securities without Readily Determinable Fair Value, Amount 2,200,000   2,200,000     $ 2,200,000
Equity Securities [Member]            
Summary of Investment Holdings [Line Items]            
Market-to-market losses 3,000   13,000      
Other Debt Obligations [Member]            
Summary of Investment Holdings [Line Items]            
Carrying value of other equity security         $ (400,000)  
Available for sale Securities [Member]            
Summary of Investment Holdings [Line Items]            
Carrying value of other equity security         $ 400,000  
Investment in Federal Home Loan Bank Stock [Member]            
Summary of Investment Holdings [Line Items]            
Dividend income from FHLB stock $ 700,000 $ 500,000 $ 2,000,000 $ 1,500,000