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		6 Months Ended		9 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Sep. 30, 2022
Financing Receivable, Allowance for Credit Loss [Line Items]
Beginning Balance	$ 37,134	$ 31,770	$ 36,922	$ 33,256	$ 33,256
Charge-offs	(561)	(349)	(895)	(661)	(1,242)
Recoveries	105	312	212	374	478
(Credit) provision for loan losses	305	2,511	744	1,275	4,430
Ending Balance	36,983	34,244	36,983	34,244
Commercial real estate - non-owner-occupied
Financing Receivable, Allowance for Credit Loss [Line Items]
Beginning Balance	16,324	16,572	17,296	18,834	18,834
Charge-offs	0	0	0	0	0
Recoveries	1	0	2	1	3
(Credit) provision for loan losses	(170)	(362)	(1,143)	(2,625)	(1,541)
Ending Balance	16,155	16,210	16,155	16,210
Commercial real estate - owner-occupied
Financing Receivable, Allowance for Credit Loss [Line Items]
Beginning Balance	2,470	2,339	2,362	2,539	2,539
Charge-offs	0	0	0	0	0
Recoveries	0	0	0	2	2
(Credit) provision for loan losses	(119)	162	(11)	(40)	(179)
Ending Balance	2,351	2,501	2,351	2,501
Commercial
Financing Receivable, Allowance for Credit Loss [Line Items]
Beginning Balance	4,581	4,842	5,446	4,202	4,202
Charge-offs	(534)	(316)	(846)	(561)	(1,042)
Recoveries	64	223	163	280	379
(Credit) provision for loan losses	684	397	32	1,225	1,907
Ending Balance	4,795	5,146	4,795	5,146
Residential real estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Beginning Balance	10,812	6,476	9,089	6,133	6,133
Charge-offs	0	(16)	(18)	(16)	(66)
Recoveries	29	0	33	0	0
(Credit) provision for loan losses	(214)	1,978	1,523	2,321	3,022
Ending Balance	10,627	8,438	10,627	8,438
Home equity
Financing Receivable, Allowance for Credit Loss [Line Items]
Beginning Balance	2,440	1,435	2,225	1,469	1,469
Charge-offs	0	0	0	0	0
Recoveries	0	86	0	86	87
(Credit) provision for loan losses	(43)	275	172	241	669
Ending Balance	2,397	1,796	2,397	1,796
Consumer
Financing Receivable, Allowance for Credit Loss [Line Items]
Beginning Balance	507	106	504	79	79
Charge-offs	(27)	(17)	(31)	(84)	(134)
Recoveries	11	3	14	5	7
(Credit) provision for loan losses	167	61	171	153	$ 552
Ending Balance	$ 658	$ 153	$ 658	$ 153