INVESTMENT SECURITIES - Summary of Amortized Cost and Fair Value and Corresponding Amounts of Gross Unrealized Gains and Losses (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 466,806	$ 460,999
Gross Unrealized Gains	9,487	12,054
Gross Unrealized Losses	3,855	6,588
Fair Value	472,438	466,465
US Treasury Securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	20,084
Gross Unrealized Gains	0
Gross Unrealized Losses	382
Fair Value	19,702
States and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	185,437	104,704
Gross Unrealized Gains	8,606	9,091
Gross Unrealized Losses	673	1,125
Fair Value	193,370	112,670
GSE residential MBSs
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	41,260	4,197
Gross Unrealized Gains	44	96
Gross Unrealized Losses	578	0
Fair Value	40,726	4,293
GSE residential CMOs
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	66,430	56,856
Gross Unrealized Gains	436	2,226
Gross Unrealized Losses	944	1,071
Fair Value	65,922	58,011
Non-agency CMOs
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	30,676	16,505
Gross Unrealized Gains	0	413
Gross Unrealized Losses	978	0
Fair Value	29,698	16,918
Private label commercial CMOs
Debt Securities, Available-for-sale [Line Items]
Amortized Cost		63,941
Gross Unrealized Gains		57
Gross Unrealized Losses		1,762
Fair Value		62,236
Asset-backed
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	122,520	214,425
Gross Unrealized Gains	401	171
Gross Unrealized Losses	300	2,630
Fair Value	122,621	211,966
Other
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	399	371
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	$ 399	$ 371