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RISK MANAGEMENT AND DERIVATIVE INSTRUMENTS - Amount and Market Value of Mortgage Banking Derivatives (Detail) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015
--- | --- | --- | ---
Interest rate swaps on deposits and other borrowings |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivatives asset, fair values |  |  | $ 918
Other Assets |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Notional Amount Assets | $ 496,618 | $ 783,342 |
Derivatives asset, fair values | 12,288 | 9,042 |
Other Assets | Interest rate lock commitments |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Notional Amount Assets | 368,797 | 262,135 |
Derivatives asset, fair values | 11,700 | 7,343 |
Other Assets | Mandatory forward commitments |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Notional Amount Assets | 104,582 | 468,740 |
Derivatives asset, fair values | 465 | 1,130 |
Other Assets | Interest rate swaps on deposits and other borrowings |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Notional Amount Assets | 0 | 25,000 |
Derivatives asset, fair values | 0 | 331 |
Other Assets | Interest rate swaps and cap on loans with customers |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Notional Amount Assets | 23,239 | 27,467 |
Derivatives asset, fair values | 123 | 238 |
Accrued Expenses and Other Liabilities |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Notional Amount Liability | 889,463 | 309,529 |
Derivatives liability, fair values | 6,543 | 1,067 |
Accrued Expenses and Other Liabilities | Interest rate lock commitments |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Notional Amount Liability | 13,587 | 16,790 |
Derivatives liability, fair values | 92 | 88 |
Accrued Expenses and Other Liabilities | Mandatory forward commitments |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Notional Amount Liability | 777,637 | 215,272 |
Derivatives liability, fair values | 4,936 | 300 |
Accrued Expenses and Other Liabilities | Interest rate swaps on deposits and other borrowings |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Notional Amount Liability | 75,000 | 50,000 |
Derivatives liability, fair values | 1,392 | 441 |
Accrued Expenses and Other Liabilities | Interest rate swaps and caps on loans with correspondent bank |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Notional Amount Liability | 23,239 | 27,467 |
Derivatives liability, fair values | $ 123 | $ 238 |

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