ALLOWANCE FOR CREDIT LOSSES AND CREDIT QUALITY - Schedule of Activity in the Allowance for Credit Losses by Portfolio Segment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 66,552	$ 80,711	$ 85,960	$ 71,972	$ 71,972
Provision for credit losses	2,000	3,059	11,800	13,059
Loans charged-off	(573)	(231)	(30,193)	(1,811)	(3,468)
Recoveries	189	88	601	407
Net loans (charged-off) recovered	(384)	(143)	(29,592)	(1,404)
Ending balance	68,168	83,627	68,168	83,627	85,960
Unallocated
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Beginning balance	400	399	383	372	372
Provision for credit losses	(29)	(36)	(12)	(9)
Loans charged-off	0	0	0	0
Recoveries	0	0	0	0
Net loans (charged-off) recovered	0	0	0	0
Ending balance	371	363	371	363	383
Total commercial loans | Commercial and Industrial
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Beginning balance	25,882	39,161	45,539	30,338	30,338
Provision for credit losses	1,447	3,498	10,335	12,452
Loans charged-off	(222)	(72)	(28,848)	(278)
Recoveries	42	18	123	93
Net loans (charged-off) recovered	(180)	(54)	(28,725)	(185)
Ending balance	27,149	42,605	27,149	42,605	45,539
Total commercial loans | Commercial Real Estate and Multifamily Residential
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Beginning balance	31,082	31,687	30,865	31,335	31,335
Provision for credit losses	(197)	(355)	(32)	784
Loans charged-off	0	0	0	(840)
Recoveries	27	26	79	79
Net loans (charged-off) recovered	27	26	79	(761)
Ending balance	30,912	31,358	30,912	31,358	30,865
Total commercial loans | Agri-business and Agricultural
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Beginning balance	3,299	3,668	3,541	4,150	4,150
Provision for credit losses	(80)	(254)	(322)	(736)
Loans charged-off	0	0	0	0
Recoveries	0	0	0	0
Net loans (charged-off) recovered	0	0	0	0
Ending balance	3,219	3,414	3,219	3,414	3,541
Total commercial loans | Other Commercial
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Beginning balance	720	820	743	1,129	1,129
Provision for credit losses	(29)	(86)	(52)	(395)
Loans charged-off	0	0	0	0
Recoveries	0	0	0	0
Net loans (charged-off) recovered	0	0	0	0
Ending balance	691	734	691	734	743
Total consumer loans | Consumer 1-4 Family Mortgage
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Beginning balance	3,590	3,586	3,358	3,474	3,474
Provision for credit losses	460	(16)	878	73
Loans charged-off	(4)	(3)	(226)	(25)
Recoveries	16	4	52	49
Net loans (charged-off) recovered	12	1	(174)	24
Ending balance	4,062	3,571	4,062	3,571	3,358
Total consumer loans | Other Consumer
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]
Beginning balance	1,579	1,390	1,531	1,174	1,174
Provision for credit losses	428	308	1,005	890
Loans charged-off	(347)	(156)	(1,119)	(668)
Recoveries	104	40	347	186
Net loans (charged-off) recovered	(243)	(116)	(772)	(482)
Ending balance	$ 1,764	$ 1,582	$ 1,764	$ 1,582	$ 1,531