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RISK MANAGEMENT AND DERIVATIVE INSTRUMENTS - Amount and Market Value of Mortgage Banking Derivatives (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Other Assets
Derivatives, Fair Value [Line Items]
Notional Amount Assets	$ 429,917	$ 205,658
Derivatives asset, fair values	13,555	6,379
Other Assets \| Interest rate lock commitments
Derivatives, Fair Value [Line Items]
Notional Amount Assets	429,917	179,923
Derivatives asset, fair values	13,555	5,750
Other Assets \| Mandatory forward commitments
Derivatives, Fair Value [Line Items]
Notional Amount Assets	0	25,735
Derivatives asset, fair values	0	629
Accrued Expenses and Other Liabilities
Derivatives, Fair Value [Line Items]
Notional Amount Liability	656,978	424,904
Derivatives liability, fair values	4,552	3,235
Accrued Expenses and Other Liabilities \| Interest rate lock commitments
Derivatives, Fair Value [Line Items]
Notional Amount Liability	9,978	10,075
Derivatives liability, fair values	98	197
Accrued Expenses and Other Liabilities \| Mandatory forward commitments
Derivatives, Fair Value [Line Items]
Notional Amount Liability	572,000	364,829
Derivatives liability, fair values	4,039	2,803
Accrued Expenses and Other Liabilities \| Interest rate swap
Derivatives, Fair Value [Line Items]
Notional Amount Liability	75,000	50,000
Derivatives liability, fair values	$ 415	$ 235