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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
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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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