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GOODWILL AND OTHER INTANGIBLES - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018 | Feb. 15, 2016 | Jun. 30, 2012
Finite Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Goodwill | $ 28,100 |  | $ 28,100 |  | $ 28,100 |  |
Amortization expense |  |  | 1,551 | $ 1,868 |  |  |
Net carrying amount | 3,900 |  | 3,900 |  | 4,300 |  |
Core Deposits [Member] |  |  |  |  |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Finite Lived Intangible Assets Gross | 51,664 |  | 51,664 |  | 51,664 |  |
Amortization expense | 200 | $ 200 | 400 | 600 |  |  |
Net carrying amount | 3,903 |  | $ 3,903 |  | $ 4,335 |  |
Remaining amortization period |  |  | 5 years 7 months 6 days |  | 6 years |  |
Customer Relationships [Member] | Credit Card [Member] |  |  |  |  |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Finite Lived Intangible Assets Gross | 24,465 |  | $ 24,465 |  | $ 24,465 |  | $ 24,500
Amortization expense | 500 | 600 | 1,000 | 1,100 |  |  |
Net carrying amount | 4,659 |  | $ 4,659 |  | $ 5,702 |  |
Remaining amortization period |  |  | 2 years 4 months 24 days |  | 2 years 10 months 24 days |  |
Customer Relationships [Member] | Insurance Customer Intangible [Member] |  |  |  |  |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Finite Lived Intangible Assets Gross | 1,067 |  | $ 1,067 |  | $ 1,067 |  |
Amortization expense | 38 | $ 38 | 76 | $ 76 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles |  |  |  |  |  | $ 1,100 |
Net carrying amount | $ 546 |  | $ 546 |  | $ 622 |  |
Remaining amortization period |  |  | 3 years 6 months |  | 4 years |  |

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