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LOANS AND ALLOWANCE FOR CREDIT LOSSES ON LOANS (Activity in Allowance for Credit Losses on Loans by Portfolio Segment) (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended		12 Months Ended
	Jan. 02, 2025	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Financing Receivable, Allowance for Credit Loss [Line Items]
Beginning balance		$ 53,022	$ 35,412	$ 35,728	$ 36,935	$ 36,935
Charge-offs		(11,170)	(422)	(12,715)	(1,240)	(1,883)
Recoveries		109	141	408	412	623
Acquired PCD loans (Note 3)				3,071
Provision for acquired non-PCD loans (Note 3)	$ 6,300			6,293
General provision for loan losses				12,716
(Credit) provision for loan losses		3,540	283	19,009	(693)	53
Ending balance		45,501	35,414	45,501	35,414	35,728
Commercial real estate - non-owner-occupied
Financing Receivable, Allowance for Credit Loss [Line Items]
Beginning balance		19,398	15,268	14,897	16,581	16,581
Charge-offs		(27)	0	(27)	0	0
Recoveries		0	1	2	9	10
Acquired PCD loans (Note 3)				1,659
Provision for acquired non-PCD loans (Note 3)				2,335
General provision for loan losses				(138)
(Credit) provision for loan losses		(643)	552	2,197	(769)	(1,694)
Ending balance		18,728	15,821	18,728	15,821	14,897
Commercial real estate - owner-occupied
Financing Receivable, Allowance for Credit Loss [Line Items]
Beginning balance		4,314	2,166	2,481	2,290	2,290
Charge-offs		0	0	(191)	0	0
Recoveries		8	0	59	0	0
Acquired PCD loans (Note 3)				340
Provision for acquired non-PCD loans (Note 3)				840
General provision for loan losses				717
(Credit) provision for loan losses		(76)	161	1,557	37	191
Ending balance		4,246	2,327	4,246	2,327	2,481
Commercial
Financing Receivable, Allowance for Credit Loss [Line Items]
Beginning balance		12,075	5,407	5,856	4,869	4,869
Charge-offs		(11,075)	(394)	(12,320)	(1,157)	(1,784)
Recoveries		87	108	317	270	455
Acquired PCD loans (Note 3)				575
Provision for acquired non-PCD loans (Note 3)				816
General provision for loan losses				10,528
(Credit) provision for loan losses		4,685	(320)	11,344	819	2,316
Ending balance		5,772	4,801	5,772	4,801	5,856
Residential real estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Beginning balance		13,509	9,571	9,979	10,254	10,254
Charge-offs		0	0	(4)	0	0
Recoveries		8	6	19	19	26
Acquired PCD loans (Note 3)				305
Provision for acquired non-PCD loans (Note 3)				1,979
General provision for loan losses				566
(Credit) provision for loan losses		(673)	(136)	2,545	(832)	(301)
Ending balance		12,844	9,441	12,844	9,441	9,979
Home equity
Financing Receivable, Allowance for Credit Loss [Line Items]
Beginning balance		3,565	2,311	2,397	2,217	2,217
Charge-offs		(18)	(1)	(22)	(1)	(1)
Recoveries		1	5	1	86	98
Acquired PCD loans (Note 3)				165
Provision for acquired non-PCD loans (Note 3)				268
General provision for loan losses				953
(Credit) provision for loan losses		214	(27)	1,221	(14)	83
Ending balance		3,762	2,288	3,762	2,288	2,397
Consumer
Financing Receivable, Allowance for Credit Loss [Line Items]
Beginning balance		161	689	118	724	724
Charge-offs		(50)	(27)	(151)	(82)	(98)
Recoveries		5	21	10	28	34
Acquired PCD loans (Note 3)				27
Provision for acquired non-PCD loans (Note 3)				55
General provision for loan losses				90
(Credit) provision for loan losses		33	53	145	66	(542)
Ending balance		$ 149	$ 736	$ 149	$ 736	$ 118

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