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FAIR VALUE MEASUREMENTS - Additional Information on Non-Recurring Basis (Detail) - USD ($) $ in Millions | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | --- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Impaired loans | $ 2.7 |  |  |  |  |
Level 1 [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Loan servicing rights, fair value | 0.0 |  | $ 0.0 |  |  |
Level 2 [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Loan servicing rights, fair value | 0.0 |  | 0.0 |  |  |
Level 3 [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Loan servicing rights, fair value | 44.0 |  | 45.0 |  |  |
Fair Value, Nonrecurring [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Impaired loans | 5.0 |  | 15.0 |  |  |
Other real estate owned | 2.0 |  | 5.0 |  |  |
Fair Value, Nonrecurring [Member] | Level 1 [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Impaired loans | 0.0 |  | 0.0 |  |  |
Other real estate owned | 0.0 |  | 0.0 |  |  |
Fair Value, Nonrecurring [Member] | Level 2 [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Impaired loans | 0.0 |  | 0.0 |  |  |
Other real estate owned | 0.0 |  | 0.0 |  |  |
Fair Value, Nonrecurring [Member] | Level 3 [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Impaired loans | 5.0 |  | 15.0 |  |  |
Other real estate owned | 2.0 |  | 5.0 |  |  |
SBA-Guaranteed Loan Servicing [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Loan servicing rights, fair value | 4.0 | $ 4.0 | 4.0 | $ 5.0 | $ 5.0 | $ 5.0
SBA-Guaranteed Loan Servicing [Member] | Fair Value, Nonrecurring [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Loan servicing rights, fair value | 4.0 |  | 4.0 |  |  |
SBA-Guaranteed Loan Servicing [Member] | Fair Value, Nonrecurring [Member] | Level 1 [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Loan servicing rights, fair value | 0.0 |  | 0.0 |  |  |
SBA-Guaranteed Loan Servicing [Member] | Fair Value, Nonrecurring [Member] | Level 2 [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Loan servicing rights, fair value | 0.0 |  | 0.0 |  |  |
SBA-Guaranteed Loan Servicing [Member] | Fair Value, Nonrecurring [Member] | Level 3 [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Loan servicing rights, fair value | 4.0 |  | 4.0 |  |  |
Mortgage Servicing Rights [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Loan servicing rights, fair value | 39.8 | $ 40.3 | $ 41.1 | $ 38.6 | $ 36.4 | $ 32.4
Mortgage Servicing Rights [Member] | Fair Value, Nonrecurring [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Loan servicing rights, fair value | 25.0 |  |  |  |  |
Mortgage Servicing Rights [Member] | Fair Value, Nonrecurring [Member] | Level 1 [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Loan servicing rights, fair value | 0.0 |  |  |  |  |
Mortgage Servicing Rights [Member] | Fair Value, Nonrecurring [Member] | Level 2 [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Loan servicing rights, fair value | 0.0 |  |  |  |  |
Mortgage Servicing Rights [Member] | Fair Value, Nonrecurring [Member] | Level 3 [Member] |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Loan servicing rights, fair value | $ 25.0 |  |  |  |  |

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