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LOANS AND LEASES - Additional Information (Detail) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018 | Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Carrying amount | $ 22,543.0 |  | $ 22,153.0 |  |  |
Reclassification from non-accretable difference | $ 58.1 | $ 129.0 |  |  |  |
Sustained period of delinquency for impairment evaluation | 90 days |  |  |  |  |
Valuation for impairment of loans with pooled reserves | $ 1.0 |  |  |  |  |
Minimum amount to allocate specific valuation allowance | 1.0 |  |  |  |  |
Interest income on impaired loans | 3.0 | 3.1 |  |  |  |
Restructured loans returned to performing status | 3.1 |  |  |  |  |
Minimum reserves for commercial loan | 1.0 |  |  |  |  |
Total allowance on loans acquired in a business combination | 188.0 | 177.0 | 180.0 | $ 186.0 | $ 179.0 | $ 175.0
Pooled reserves for all other classes of loans | $ 3.8 |  | 4.0 |  |  |
Maximum [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Past due period for loan to be in default | 12 months |  |  |  |  |
Minimum [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Past due period for loan to be in default | 90 days |  |  |  |  |
Commercial Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Threshold period past due for default non-accrual status of trade accounts receivable | 90 days |  |  |  |  |
Installment Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Threshold period past due for default non-accrual status of trade accounts receivable | 120 days |  |  |  |  |
Residential Mortgages [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Threshold period past due for default non-accrual status of trade accounts receivable | 180 days |  |  |  |  |
Carrying value of OREO through foreclosure | $ 3.2 |  | 6.3 |  |  |
Mortgage loans on real estate, foreclosure | $ 9.9 |  | $ 8.9 |  |  |
Loan Portfolio Diversification Risk [Member] | Residential Construction Loan [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Percentage of portfolio | 1.60% |  | 1.20% |  |  |
Purchased Credit-Impaired Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Carrying amount | $ 1.7 |  | $ 1.7 |  |  |
Purchased Credit-Impaired Loans [Member] | Credit Concentration Risk [Member] | Acquired Loans Receivable [Member] | Maximum [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Percentage of portfolio |  |  | 0.04% |  |  |
Purchased Credit-Impaired Loans [Member] | Credit Concentration Risk [Member] | Acquired Loans Receivable [Member] | Minimum [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Percentage of portfolio | 0.05% |  |  |  |  |
Residential Construction Loan [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Carrying amount | $ 352.4 |  | $ 273.4 |  |  |
Total Commercial Loans and Leases [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Carrying amount | 14,282.0 |  | $ 13,761.0 |  |  |
Total Commercial Loans and Leases [Member] | Specific Reserves for Commercial Troubled Debt Restructurings [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total allowance on loans acquired in a business combination | 0.5 | 0.5 |  |  |  |
Total Commercial Loans and Leases [Member] | Pooled Reserves For Commercial Troubled Debt Restructurings [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total allowance on loans acquired in a business combination | $ 0.9 | $ 0.5 |  |  |  |

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