INVESTMENT SECURITIES - Schedule of Unrealized Losses and Fair Value by Investment Category for Securities Available for Sale (Detail) $ in Thousands	Dec. 31, 2020 USD ($) security	Dec. 31, 2019 USD ($) security
Debt Securities, Available-for-sale [Line Items]
Count | security	70	141
Less than 12 months, fair value	$ 34,546	$ 62,100
Less than 12 months, unrealized losses	(223)	(430)
12 months or more, fair value	14,771	17,861
12 months or more, unrealized losses	(196)	(349)
Total, fair value	49,317	79,961
Total, unrealized losses	$ (419)	$ (779)
Obligations of U.S. government agencies and corporations
Debt Securities, Available-for-sale [Line Items]
Count | security	12	21
Less than 12 months, fair value	$ 9,080	$ 19,980
Less than 12 months, unrealized losses	(19)	(94)
12 months or more, fair value	4,043	955
12 months or more, unrealized losses	(9)	(6)
Total, fair value	13,123	20,935
Total, unrealized losses	$ (28)	$ (100)
Obligations of state and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Count | security	4	10
Less than 12 months, fair value	$ 505	$ 212
Less than 12 months, unrealized losses	(3)	(1)
12 months or more, fair value	204	371
12 months or more, unrealized losses	0	(11)
Total, fair value	709	583
Total, unrealized losses	$ (3)	$ (12)
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Count | security	22	21
Less than 12 months, fair value	$ 6,970	$ 495
Less than 12 months, unrealized losses	(133)	(5)
12 months or more, fair value	2,559	7,829
12 months or more, unrealized losses	(90)	(269)
Total, fair value	9,529	8,324
Total, unrealized losses	$ (223)	$ (274)
Residential mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Count | security	6	32
Less than 12 months, fair value	$ 11,070	$ 12,341
Less than 12 months, unrealized losses	(11)	(56)
12 months or more, fair value	0	6,190
12 months or more, unrealized losses	0	(29)
Total, fair value	11,070	18,531
Total, unrealized losses	$ (11)	$ (85)
Commercial mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Count | security	26	57
Less than 12 months, fair value	$ 6,921	$ 29,072
Less than 12 months, unrealized losses	(57)	(274)
12 months or more, fair value	7,965	2,516
12 months or more, unrealized losses	(97)	(34)
Total, fair value	14,886	31,588
Total, unrealized losses	$ (154)	$ (308)