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EQUITY SECURITIES - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Summary of Investment Holdings [Line Items]          
Capital stock par value $ 100   $ 100    
Book value of investment in FHLB stock $ 41,700   $ 41,700   $ 41,900
Market-to-market gains (losses) 9,916 $ 8,513 18,866 $ 16,373  
Equity Securities [Member]          
Summary of Investment Holdings [Line Items]          
Equity Securities, FV-NI 400   400    
Market-to-market gains (losses) 6 (3) 11 (10)  
Equity Securities without Readily Determinable Fair Value, Amount 2,100   2,100   $ 2,200
Investment in Federal Home Loan Bank Stock [Member]          
Summary of Investment Holdings [Line Items]          
Dividend income from FHLB stock $ 700 $ 700 $ 1,400 $ 1,300