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LOANS AND CREDIT QUALITY - Activity in Allowance for Credit Losses by Portfolio Segment (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025
Allowance for credit losses on loans
Beginning balance	$ 153,319	$ 88,558	$ 88,558
Provision (reversal of provision) for credit losses	7,593	(3,752)
Loans charged off	(7,205)	(12,217)
Recoveries	3,089	2,926
Ending balance	156,796	75,515	153,319
Commercial and Industrial
Allowance for credit losses on loans
Beginning balance	8,417	4,869	4,869
Provision (reversal of provision) for credit losses	408	(458)
Loans charged off	(131)	(117)	(8,398)
Recoveries	166	3
Ending balance	8,860	4,297	8,417
Commercial Real Estate
Allowance for credit losses on loans
Beginning balance	114,326	35,097	35,097
Provision (reversal of provision) for credit losses	6,321	(102)
Loans charged off	0	0
Recoveries	111	0
Ending balance	120,758	34,995	114,326
Residential Real Estate
Allowance for credit losses on loans
Beginning balance	13,294	4,656	4,656
Provision (reversal of provision) for credit losses	(26)	107
Loans charged off	(1)	0	(105)
Recoveries	354	0
Ending balance	13,621	4,763	13,294
Auto
Allowance for credit losses on loans
Beginning balance	15,003	41,282	41,282
Provision (reversal of provision) for credit losses	565	(3,629)
Loans charged off	(6,420)	(11,506)	(40,679)
Recoveries	2,298	2,788
Ending balance	11,446	28,935	15,003
Other Consumer
Allowance for credit losses on loans
Beginning balance	2,279	2,654	2,654
Provision (reversal of provision) for credit losses	325	330
Loans charged off	(653)	(594)	(2,411)
Recoveries	160	135
Ending balance	$ 2,111	$ 2,525	$ 2,279

X

- 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

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

+ References

No definition available.

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X

- 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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- Definition

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 13
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

Reference 2: 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

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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

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 220
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 22
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147476148/220-40-50-22

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