SECURITIES AVAILABLE FOR SALE - Summary of Securities Available For Sale With Unrealized Losses (Detail) $ in Thousands	Dec. 31, 2019 USD ($) security	Dec. 31, 2018 USD ($) security	Dec. 31, 2017 USD ($) security
Number of Securities
Less Than 12 Months | security	22	46
12 Months or More | security	18	18
Total | security	40	64
Fair Value
Less Than 12 Months	$ 178,686	$ 200,164
12 Months or More	172,727	86,361
Total	351,413	286,525
Unrealized Losses
Less Than 12 Months	1,676	2,356
12 Months or More	4,513	3,839
Total	$ 6,189	$ 6,195
States and political subdivisions
Number of Securities
Less Than 12 Months | security	1	27
12 Months or More | security	0	6
Total | security	1	33
Fair Value
Less Than 12 Months	$ 6,173	$ 46,585
12 Months or More	0	23,036
Total	6,173	69,621
Unrealized Losses
Less Than 12 Months	32	662
12 Months or More	0	849
Total	$ 32	$ 1,511
GSE residential CMOs
Number of Securities
Less Than 12 Months | security	5	1
12 Months or More | security	1	7
Total | security	6	8
Fair Value
Less Than 12 Months	$ 37,158	$ 18,037
12 Months or More	11,602	46,168
Total	48,760	64,205
Unrealized Losses
Less Than 12 Months	309	122
12 Months or More	465	2,567
Total	$ 774	$ 2,689
Non-agency CMOs
Number of Securities
Less Than 12 Months | security	1
12 Months or More | security	0
Total | security	1
Fair Value
Less Than 12 Months	$ 17,087
12 Months or More	0
Total	17,087
Unrealized Losses
Less Than 12 Months	123
12 Months or More	0
Total	$ 123
Private label residential CMOs
Number of Securities
Less Than 12 Months | security			1
12 Months or More | security			0
Total | security			1
Fair Value
Less Than 12 Months			$ 143
12 Months or More			0
Total			143
Unrealized Losses
Less Than 12 Months			1
12 Months or More			0
Total			$ 1
Private label commercial CMOs
Number of Securities
Less Than 12 Months | security	6	11
12 Months or More | security	8	2
Total | security	14	13
Fair Value
Less Than 12 Months	$ 26,079	$ 56,499
12 Months or More	39,726	6,349
Total	65,805	62,848
Unrealized Losses
Less Than 12 Months	67	712
12 Months or More	164	209
Total	$ 231	$ 921
Asset-backed and other
Number of Securities
Less Than 12 Months | security	9	6
12 Months or More | security	9	3
Total | security	18	9
Fair Value
Less Than 12 Months	$ 92,189	$ 78,900
12 Months or More	121,399	10,808
Total	213,588	89,708
Unrealized Losses
Less Than 12 Months	1,145	859
12 Months or More	3,884	214
Total	$ 5,029	$ 1,073