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LOANS AND RELATED ALLOWANCE FOR CREDIT LOSSES - Summary of Total Loans Rated Special Mention or Lower (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	$ 7,943,481	$ 6,825,847
Total Criticized | Performing
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	196,032	241,957
Total Classified | Performing
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	126,502	141,886
Non-Accrual | Performing
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	37,853	35,326
Substandard Accruing | Performing
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	88,649	106,560
Special Mention | Performing
Financing Receivable, Allowance for Credit Loss [Line Items]
Total loans	$ 69,530	$ 100,071

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+ References

No definition available.

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- Definition

Amortized cost excluding accrued interest, before allowance for credit loss, of financing receivable. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919230-210447

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 45
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=124255206&loc=SL82895884-210446

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 3B
-URI https://asc.fasb.org/extlink&oid=124255953&loc=SL120267963-210447

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