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RISK MANAGEMENT AND DERIVATIVE INSTRUMENTS - Amount and Market Value of Mortgage Banking Derivatives (Detail) - USD ($) | Jun. 30, 2015 | Dec. 31, 2014
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Interest rate swap |  |
Derivatives, Fair Value [Line Items] |  |
Derivatives asset, fair values | $ 166,000 |
Other Assets |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount Assets | 989,175,000 | $ 205,658,000
Derivatives asset, fair values | 11,800,000 | 6,379,000
Other Assets | Interest rate lock commitments |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount Assets | 377,175,000 | 179,923,000
Derivatives asset, fair values | 9,497,000 | 5,750,000
Other Assets | Mandatory forward commitments |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount Assets | 562,000,000 | 25,735,000
Derivatives asset, fair values | 1,872,000 | 629,000
Other Assets | Interest rate swap |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount Assets | 50,000,000 | 0
Derivatives asset, fair values | 431,000 | 0
Accrued Expenses and Other Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount Liability | 46,537,000 | 424,904,000
Derivatives liability, fair values | 557,000 | 3,235,000
Accrued Expenses and Other Liabilities | Interest rate lock commitments |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount Liability | 21,537,000 | 10,075,000
Derivatives liability, fair values | 292,000 | 197,000
Accrued Expenses and Other Liabilities | Mandatory forward commitments |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount Liability | 0 | 364,829,000
Derivatives liability, fair values | 0 | 2,803,000
Accrued Expenses and Other Liabilities | Interest rate swap |  |
Derivatives, Fair Value [Line Items] |  |
Notional Amount Liability | 25,000,000 | 50,000,000
Derivatives liability, fair values | $ 265,000 | $ 235,000

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