ALLOWANCE FOR CREDIT LOSSES AND CREDIT QUALITY - Allowance for Loan Losses by Portfolio Segment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 80,711	$ 72,058	$ 71,972	$ 72,606	$ 72,606
Provision for credit losses	3,059	400	13,059	5,550
Loans charged-off	(231)	(480)	(1,811)	(6,766)	(7,332)
Recoveries	88	127	407	715
Net loans (charged-off) recovered	(143)	(353)	(1,404)	(6,051)
Ending balance	83,627	72,105	83,627	72,105	71,972
Unallocated
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Beginning balance	399	351	372	554	554
Provision for credit losses	(36)	98	(9)	(105)
Loans charged-off	0	0	0	0
Recoveries	0	0	0	0
Net loans (charged-off) recovered	0	0	0	0
Ending balance	363	449	363	449	372
Commercial Portfolio Segment | Commercial and Industrial
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Beginning balance	39,161	30,978	30,338	35,290	35,290
Provision for credit losses	3,498	(167)	12,452	1,065
Loans charged-off	(72)	(193)	(278)	(5,844)
Recoveries	18	21	93	128
Net loans (charged-off) recovered	(54)	(172)	(185)	(5,716)
Ending balance	42,605	30,639	42,605	30,639	30,338
Commercial Portfolio Segment | Commercial Real Estate and Multifamily Residential
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Beginning balance	31,687	30,913	31,335	27,394	27,394
Provision for credit losses	(355)	230	784	3,465
Loans charged-off	0	0	(840)	0
Recoveries	26	12	79	296
Net loans (charged-off) recovered	26	12	(761)	296
Ending balance	31,358	31,155	31,358	31,155	31,335
Commercial Portfolio Segment | Agri-business and Agricultural
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Beginning balance	3,668	4,402	4,150	4,429	4,429
Provision for credit losses	(254)	(139)	(736)	(166)
Loans charged-off	0	0	0	0
Recoveries	0	0	0	0
Net loans (charged-off) recovered	0	0	0	0
Ending balance	3,414	4,263	3,414	4,263	4,150
Commercial Portfolio Segment | Other Commercial
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Beginning balance	820	1,120	1,129	917	917
Provision for credit losses	(86)	(102)	(395)	101
Loans charged-off	0	0	0	0
Recoveries	0	0	0	0
Net loans (charged-off) recovered	0	0	0	0
Ending balance	734	1,018	734	1,018	1,129
Consumer Portfolio Segment | Consumer 1-4 Family Mortgage
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Beginning balance	3,586	3,448	3,474	3,001	3,001
Provision for credit losses	(16)	197	73	642
Loans charged-off	(3)	(149)	(25)	(163)
Recoveries	4	3	49	19
Net loans (charged-off) recovered	1	(146)	24	(144)
Ending balance	3,571	3,499	3,571	3,499	3,474
Consumer Portfolio Segment | Other Consumer
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Beginning balance	1,390	846	1,174	1,021	1,021
Provision for credit losses	308	283	890	548
Loans charged-off	(156)	(138)	(668)	(759)
Recoveries	40	91	186	272
Net loans (charged-off) recovered	(116)	(47)	(482)	(487)
Ending balance	$ 1,582	$ 1,082	$ 1,582	$ 1,082	$ 1,174