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UPDATE ON IMPACTS OF NATURAL DISASTERS- Additional information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Liability For Catastrophe Claims [Line Items] |  |  |  |
Proceeds from the settlement of insurance claims |  | $ 7,614 | $ 0 |
Insurance proceeds in excess of losses incurred |  | 478 | 0 |
Hurricane [Member] |  |  |  |
Liability For Catastrophe Claims [Line Items] |  |  |  |
Financing Receivable Allowance For Credit Losses | $ 24,900 | 24,900 | $ 66,500 | $ 55,600
Net Loan Loss Reserve Release | 2,800 | 11,200 |  |
Increase Decrease In Deposits Excluding Brokered Certificates Of Deposits |  | $ 602,400 |  |
Percentage Of Non Interest Bearing Demand Deposits |  | 27.00% |  |
Insurance Settlements Receivable | 4,200 | $ 4,200 |  |
Insurance proceeds in excess of losses incurred |  | 500 |  |
Increase Decrease In Non Interest Bearing Demand Deposits |  | $ 487,400 |  |
Hurricane [Member] | Consumer Portfolio Segment [Member] |  |  |  |
Liability For Catastrophe Claims [Line Items] |  |  |  |
Financing Receivable Allowance For Credit Losses Write Offs | 10,900 |  |  |
Hurricane [Member] | Wholly Owned Properties [Member] |  |  |  |
Liability For Catastrophe Claims [Line Items] |  |  |  |
Proceeds from the settlement of insurance claims | 6,800 |  |  |
Loans Receivable [Member] | Hurricane [Member] |  |  |  |
Liability For Catastrophe Claims [Line Items] |  |  |  |
Proceeds from the settlement of insurance claims | $ 800 |  |  |

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