ALLOWANCE FOR CREDIT LOSSES AND RESERVE FOR OFF-BALANCE SHEET CREDIT EXPOSURES (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Changes in the allowance
Beginning balance	$ 59,611	$ 62,225	$ 59,182	$ 63,934
Provision (credit) for credit losses on loans	3,440	3,040	11,155	9,609
Gross charge-offs	(3,895)	(4,718)	(13,174)	(15,386)
Gross recoveries	1,237	1,100	3,230	3,490
Net (charge-offs) recoveries	(2,658)	(3,618)	(9,944)	(11,896)
Ending balance	60,393	61,647	60,393	61,647
Commercial and Industrial
Changes in the allowance
Beginning balance	7,240	7,071	7,113	7,181
Provision (credit) for credit losses on loans	516	617	3,715	1,488
Gross charge-offs	(1,071)	(663)	(4,509)	(1,864)
Gross recoveries	204	158	570	378
Net (charge-offs) recoveries	(867)	(505)	(3,939)	(1,486)
Ending balance	6,889	7,183	6,889	7,183
Consumer
Changes in the allowance
Beginning balance	13,816	14,801	13,269	17,079
Provision (credit) for credit losses on loans	1,614	2,757	6,407	7,515
Gross charge-offs	(2,824)	(3,956)	(8,665)	(13,139)
Gross recoveries	1,016	934	2,611	3,081
Net (charge-offs) recoveries	(1,808)	(3,022)	(6,054)	(10,058)
Ending balance	13,622	14,536	13,622	14,536
Construction \| Real Estate Portfolio Segment [Member]
Changes in the allowance
Beginning balance	3,363	3,798	2,316	4,004
Provision (credit) for credit losses on loans	603	(1,230)	1,647	(1,436)
Gross charge-offs	0	0	0	0
Gross recoveries	0	0	3	0
Net (charge-offs) recoveries	0	0	3	0
Ending balance	3,966	2,568	3,966	2,568
Residential Mortgage \| Real Estate Portfolio Segment [Member]
Changes in the allowance
Beginning balance	13,878	15,389	15,267	14,626
Provision (credit) for credit losses on loans	303	1,052	(1,103)	2,082
Gross charge-offs	0	(99)	0	(383)
Gross recoveries	8	8	25	25
Net (charge-offs) recoveries	8	(91)	25	(358)
Ending balance	14,189	16,350	14,189	16,350
Home Equity \| Real Estate Portfolio Segment [Member]
Changes in the allowance
Beginning balance	1,049	3,829	2,335	3,501
Provision (credit) for credit losses on loans	105	(1,360)	(1,193)	(1,038)
Gross charge-offs	0	0	0	0
Gross recoveries	9	0	21	6
Net (charge-offs) recoveries	9	0	21	6
Ending balance	1,163	2,469	1,163	2,469
Commercial Mortgage \| Real Estate Portfolio Segment [Member]
Changes in the allowance
Beginning balance	20,265	17,337	18,882	17,543
Provision (credit) for credit losses on loans	299	1,204	1,682	998
Gross charge-offs	0	0	0	0
Gross recoveries	0	0	0	0
Net (charge-offs) recoveries	0	0	0	0
Ending balance	$ 20,564	$ 18,541	$ 20,564	$ 18,541

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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- Definition

Amount excluding accrued interest, of allowance for credit loss on financing receivable. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479344/326-20-45-1

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- Definition

Amount, excluding accrued interest, of increase in allowance for credit loss on financing receivable from recovery. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

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Amount, excluding accrued interest, of decrease in allowance for credit loss on financing receivable from writeoff. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-6

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

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- Definition

Amount, excluding accrued interest, of decrease (increase) in allowance for credit loss on financing receivable from writeoff (recovery). Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

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- Definition

Amount, excluding accrued interest, of credit loss expense (reversal of expense) on financing receivable. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

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