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GOODWILL AND OTHER INTANGIBLES - Gross Amount and Accumulated Amortization of Other Intangible Assets (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017 | Jun. 30, 2012
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract] |  |  |
Finite Lived Intangible Assets Amortization Expense Remainder Of Fiscal Year | $ 860 |  |
Finite Lived Intangible Assets Amortization Expense Year Two | 3,088 |  |
Finite Lived Intangible Assets Amortization Expense Year Three | 2,851 |  |
Finite Lived Intangible Assets Amortization Expense Year Four | 2,658 |  |
Finite Lived Intangible Assets Amortization Expense Year Five | 915 |  |
Finite Lived Intangible Assets Amortization Expense After Year Five | 1,150 |  |
Core Deposits [Member] |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |
Gross amount | 51,664 | $ 51,664 |
Accumulated amortization | (47,079) | (46,186) |
Net carrying amount | $ 4,585 | $ 5,478 |
Remaining amortization period | 6 years 3 months 18 days | 7 years |
Customer Relationships [Member] | Credit Card [Member] |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |
Gross amount | $ 24,465 | $ 24,465 | $ 24,500
Accumulated amortization | (18,189) | (16,465) |
Net carrying amount | $ 6,276 | $ 8,000 |
Remaining amortization period | 3 years 1 month 6 days | 3 years 10 months 24 days |
Customer Relationships [Member] | Insurance Customer Intangible [Member] |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |
Gross amount | $ 1,067 | $ 1,067 |
Accumulated amortization | (406) | (292) |
Net carrying amount | $ 661 | $ 775 |
Remaining amortization period | 4 years 3 months 18 days | 5 years |

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