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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Allowance for Loan Losses Additional Information (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total recorded investment | $ 7,251,480 | $ 5,898,405 |
Commercial lending relationship threshold |  |  | $ 5,000
Provision for (reversal of) credit losses | 6,854 | 29,719 | 35,829
Allowance for Loan Losses |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Initial allowance for credit losses purchased in acquisition | 13,650 |  |
Recoveries | 3,358 | 1,815 |
Charge-offs recorded | 9,886 | 15,417 |
Charge-off of line of credit | 6,528 | 13,602 |
Provision for (reversal of) credit losses | 4,432 | 29,374 |
Loans Receivable |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Accrued interest receivable | 25,800 | 24,700 |
Shared National Credit |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total recorded investment |  | 16,100 |
Charge-offs recorded | 10,700 |  |
Commercial real estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Initial allowance for credit losses purchased in acquisition | 13,650 | 0 | 0
Recoveries | 3,358 | 1,815 | 836
Charge-offs recorded | 9,886 | 15,417 | 41,766
Charge-off of line of credit | 6,528 | 13,602 | 40,930
Provision for (reversal of) credit losses | 6,854 | 29,719 | 35,829
Commercial real estate | Allowance for Loan Losses |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Initial allowance for credit losses purchased in acquisition | 13,650 | 0 | 0
Recoveries | 3,358 | 1,815 | 836
Charge-offs recorded | 9,886 | 15,417 | 41,766
Charge-off of line of credit | 6,528 | 13,602 | 40,930
Provision for (reversal of) credit losses | 4,432 | 29,374 | 36,387
Commercial real estate | PCD loans | Allowance for Loan Losses |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Recoveries | 2,600 |  |
PMB Acquisition | Commercial real estate | Allowance for Loan Losses |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Initial allowance for credit losses purchased in acquisition | 13,700 |  |
Provision for (reversal of) credit losses | 11,300 |  |
Commercial | Loans Receivable |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Charge-off of line of credit |  |  | $ 35,100
Commercial | Commercial real estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total recorded investment | 1,311,105 | 807,195 |
Commercial | Commercial real estate | Allowance for Loan Losses |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Initial allowance for credit losses purchased in acquisition | 614 |  |
Recoveries | 0 | 0 |
Charge-offs recorded | 576 | 0 |
Charge-off of line of credit | 576 | 0 |
Provision for (reversal of) credit losses | 2,615 | $ 8,286 |
Commercial and industrial |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Net charge-offs | 4,400 |  |
SBA |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Net charge-offs | $ 2,000 |  |

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