INVESTMENT SECURITIES - Summary of Amortized Cost and Fair Value and Corresponding Amounts of Gross Unrealized Gains and Losses (Detail) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 549,089	$ 563,278
Gross Unrealized Gains	1,317	490
Gross Unrealized Losses	36,887	50,040
Allowance for Credit Losses	0
Fair Value	513,519	513,728
U.S. Treasury securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	20,057	20,070
Gross Unrealized Gains	0	0
Gross Unrealized Losses	2,217	2,779
Allowance for Credit Losses	0
Fair Value	17,840	17,291
U.S. government agencies
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	3,994	4,907
Gross Unrealized Gains	157	228
Gross Unrealized Losses	0	0
Allowance for Credit Losses	0
Fair Value	4,151	5,135
States and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	221,624	225,825
Gross Unrealized Gains	28	19
Gross Unrealized Losses	18,530	28,430
Allowance for Credit Losses	0
Fair Value	203,122	197,414
GSE residential MBSs
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	61,669	63,778
Gross Unrealized Gains	0	0
Gross Unrealized Losses	4,037	4,376
Allowance for Credit Losses	0
Fair Value	57,632	59,402
GSE commercial MBSs
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	4,387
Gross Unrealized Gains	356
Gross Unrealized Losses	0
Allowance for Credit Losses	0
Fair Value	4,743
GSE residential CMOs
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	79,284	75,446
Gross Unrealized Gains	18	0
Gross Unrealized Losses	6,200	7,068
Allowance for Credit Losses	0
Fair Value	73,102	68,378
Non-agency CMOs
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	48,162	42,298
Gross Unrealized Gains	316	243
Gross Unrealized Losses	3,809	2,783
Allowance for Credit Losses	0
Fair Value	44,669	39,758
Asset-backed
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	109,786	130,577
Gross Unrealized Gains	442	0
Gross Unrealized Losses	2,094	4,604
Allowance for Credit Losses	0
Fair Value	108,134	125,973
Other
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	126	377
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Allowance for Credit Losses	0
Fair Value	$ 126	$ 377

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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