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INVESTMENT SECURITIES - Summary of Amortized Cost and Fair Value and Corresponding Amounts of Gross Unrealized Gains and Losses (Detail) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 864,920	$ 549,089
Gross Unrealized Gains	1,766	1,317
Gross Unrealized Losses	36,975	36,887
Allowance for Credit Losses	0	0
Fair Value	829,711	513,519
U.S. Treasury securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	20,043	20,057
Gross Unrealized Gains	0	0
Gross Unrealized Losses	1,980	2,217
Allowance for Credit Losses	0	0
Fair Value	18,063	17,840
U.S. government agencies
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2,953	3,994
Gross Unrealized Gains	100	157
Gross Unrealized Losses	0	0
Allowance for Credit Losses	0	0
Fair Value	3,053	4,151
States and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	220,418	221,624
Gross Unrealized Gains	10	28
Gross Unrealized Losses	20,400	18,530
Allowance for Credit Losses	0	0
Fair Value	200,028	203,122
GSE residential MBSs
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	155,793	61,669
Gross Unrealized Gains	52	0
Gross Unrealized Losses	4,297	4,037
Allowance for Credit Losses	0	0
Fair Value	151,548	57,632
GSE commercial MBSs
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	8,570	4,387
Gross Unrealized Gains	243	356
Gross Unrealized Losses	21	0
Allowance for Credit Losses	0	0
Fair Value	8,792	4,743
GSE residential CMOs
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	331,016	79,284
Gross Unrealized Gains	485	18
Gross Unrealized Losses	6,809	6,200
Allowance for Credit Losses	0	0
Fair Value	324,692	73,102
Non-agency CMOs
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	35,548	48,162
Gross Unrealized Gains	202	316
Gross Unrealized Losses	2,466	3,809
Allowance for Credit Losses	0	0
Fair Value	33,284	44,669
Asset-backed
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	88,450	109,786
Gross Unrealized Gains	655	442
Gross Unrealized Losses	1,002	2,094
Allowance for Credit Losses	0	0
Fair Value	88,103	108,134
Corporate bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	1,935
Gross Unrealized Gains	19
Gross Unrealized Losses	0
Allowance for Credit Losses	0
Fair Value	1,954
Other
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	194	126
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Allowance for Credit Losses	0	0
Fair Value	$ 194	$ 126

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