ALLOWANCE FOR CREDIT LOSSES AND CREDIT QUALITY - Allowance for Loan Losses by Portfolio Segment (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 73,180	$ 71,215	$ 71,972	$ 72,606	$ 72,606
Provision for credit losses	8,480	800	10,000	5,150
Loans charged-off	(1,076)	(390)	(1,580)	(6,286)	(7,332)
Recoveries	127	433	319	588
Net loans (charged-off) recovered	(949)	43	(1,261)	(5,698)
Ending balance	80,711	72,058	80,711	72,058	71,972
Unallocated
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Beginning balance	501	840	372	554	554
Provision for credit losses	(102)	(489)	27	(203)
Loans charged-off	0	0	0	0
Recoveries	0	0	0	0
Net loans (charged-off) recovered	0	0	0	0
Ending balance	399	351	399	351	372
Commercial Portfolio Segment | Commercial and Industrial
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Beginning balance	30,720	31,190	30,338	35,290	35,290
Provision for credit losses	8,412	(272)	8,954	1,232
Loans charged-off	(12)	(7)	(206)	(5,651)
Recoveries	41	67	75	107
Net loans (charged-off) recovered	29	60	(131)	(5,544)
Ending balance	39,161	30,978	39,161	30,978	30,338
Commercial Portfolio Segment | Commercial Real Estate and Multifamily Residential
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Beginning balance	32,078	29,036	31,335	27,394	27,394
Provision for credit losses	422	1,593	1,139	3,235
Loans charged-off	(840)	0	(840)	0
Recoveries	27	284	53	284
Net loans (charged-off) recovered	(813)	284	(787)	284
Ending balance	31,687	30,913	31,687	30,913	31,335
Commercial Portfolio Segment | Agri-business and Agricultural
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Beginning balance	4,112	4,621	4,150	4,429	4,429
Provision for credit losses	(444)	(219)	(482)	(27)
Loans charged-off	0	0	0	0
Recoveries	0	0	0	0
Net loans (charged-off) recovered	0	0	0	0
Ending balance	3,668	4,402	3,668	4,402	4,150
Commercial Portfolio Segment | Other Commercial
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Beginning balance	1,022	1,034	1,129	917	917
Provision for credit losses	(202)	86	(309)	203
Loans charged-off	0	0	0	0
Recoveries	0	0	0	0
Net loans (charged-off) recovered	0	0	0	0
Ending balance	820	1,120	820	1,120	1,129
Consumer Portfolio Segment | Consumer 1-4 Family Mortgage
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Beginning balance	3,518	3,398	3,474	3,001	3,001
Provision for credit losses	68	51	89	445
Loans charged-off	(22)	(14)	(22)	(14)
Recoveries	22	13	45	16
Net loans (charged-off) recovered	0	(1)	23	2
Ending balance	3,586	3,448	3,586	3,448	3,474
Consumer Portfolio Segment | Other Consumer
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Beginning balance	1,229	1,096	1,174	1,021	1,021
Provision for credit losses	326	50	582	265
Loans charged-off	(202)	(369)	(512)	(621)
Recoveries	37	69	146	181
Net loans (charged-off) recovered	(165)	(300)	(366)	(440)
Ending balance	$ 1,390	$ 846	$ 1,390	$ 846	$ 1,174