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EQUITY SECURITIES - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Summary of Investment Holdings [Line Items]
Capital stock par value	$ 100		$ 100
Book value of investment in FHLB stock	$ 27,000		$ 27,000		$ 31,200
Market-to-market gain (loss)	12,840	$ 10,132	35,455	$ 29,263
Equity Securities without Readily Determinable Fair Value, Amount	37,427		37,427		37,588
Equity Securities [Member]
Summary of Investment Holdings [Line Items]
Equity Securities, FV-NI	5,400		5,400		1,500
Market-to-market gain (loss)	(37)	(3)	(42)	40
Equity Securities without Readily Determinable Fair Value, Amount	5,000		5,000		$ 4,900
Investment in Federal Home Loan Bank Stock [Member]
Summary of Investment Holdings [Line Items]
Dividend income from FHLB stock	$ 300	$ 400	$ 1,100	$ 1,500

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Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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Federal Home Loan Bank (FHLB) stock represents an equity interest in a FHLB. It does not have a readily determinable fair value because its ownership is restricted and it lacks a market (liquidity).

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