INVESTMENT SECURITIES - Amortized Cost and Fair Values of AFS Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 553,222	$ 563,278
Gross Unrealized Gains	1,259	490
Gross Unrealized Losses	59,319	50,040
Allowance for Credit Losses	0
Fair Value	495,162	513,728
U.S. Treasury securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	20,060	20,070
Gross Unrealized Gains	0	0
Gross Unrealized Losses	2,917	2,779
Allowance for Credit Losses	0
Fair Value	17,143	17,291
U.S. Government Agencies
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	4,149	4,907
Gross Unrealized Gains	173	228
Gross Unrealized Losses	0	0
Allowance for Credit Losses	0
Fair Value	4,322	5,135
States and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	223,807	225,825
Gross Unrealized Gains	0	19
Gross Unrealized Losses	35,690	28,430
Allowance for Credit Losses	0
Fair Value	188,117	197,414
GSE residential MBSs
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	62,395	63,778
Gross Unrealized Gains	0	0
Gross Unrealized Losses	5,044	4,376
Allowance for Credit Losses	0
Fair Value	57,351	59,402
GSE commercial MBSs
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	4,413
Gross Unrealized Gains	365
Gross Unrealized Losses	0
Allowance for Credit Losses	0
Fair Value	4,778
GSE residential CMOs
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	80,693	75,446
Gross Unrealized Gains	0	0
Gross Unrealized Losses	8,656	7,068
Allowance for Credit Losses	0
Fair Value	72,037	68,378
Non-agency CMOs
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	43,772	42,298
Gross Unrealized Gains	274	243
Gross Unrealized Losses	5,067	2,783
Allowance for Credit Losses	0
Fair Value	38,979	39,758
Asset-backed
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	113,813	130,577
Gross Unrealized Gains	447	0
Gross Unrealized Losses	1,945	4,604
Allowance for Credit Losses	0
Fair Value	112,315	125,973
Other
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	120	377
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Allowance for Credit Losses	0
Fair Value	$ 120	$ 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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