EQUITY SECURITIES - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Summary of Investment Holdings [Line Items]
Capital stock par value	$ 100
Book value of investment in FHLB stock	$ 41,900	$ 40,900
Equity Securities without Readily Determinable Fair Value, Amount	2,200
Equity Securities [Member]
Summary of Investment Holdings [Line Items]
Market-to-market loss	(9)
Other Debt Obligations [Member]
Summary of Investment Holdings [Line Items]
Equity Securities	400
Available-for-sale Securities [Member]
Summary of Investment Holdings [Line Items]
Equity Securities	(400)
Investment in Federal Home Loan Bank Stock [Member]
Summary of Investment Holdings [Line Items]
Dividend income from FHLB stock	$ 2,700	$ 2,100	$ 1,500