RISK MANAGEMENT AND DERIVATIVE INSTRUMENTS - Amount and Market Value of Mortgage Banking Derivatives (Detail) - USD ($) $ in Thousands	Sep. 30, 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	$ 697,517	$ 783,342
Derivatives asset, fair values	15,746	9,042
Other Assets | Interest rate lock commitments
Derivatives, Fair Value [Line Items]
Notional Amount Assets	521,547	262,135
Derivatives asset, fair values	15,200	7,343
Other Assets | Mandatory forward commitments
Derivatives, Fair Value [Line Items]
Notional Amount Assets	138,400	468,740
Derivatives asset, fair values	140	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	27,140	27,467
Derivatives asset, fair values	285	238
Other Assets | Foreign exchange contracts
Derivatives, Fair Value [Line Items]
Notional Amount Assets	10,430	0
Derivatives asset, fair values	121	0
Accrued Expenses and Other Liabilities
Derivatives, Fair Value [Line Items]
Notional Amount Liability	1,083,322	309,529
Derivatives liability, fair values	4,650	1,067
Accrued Expenses and Other Liabilities | Interest rate lock commitments
Derivatives, Fair Value [Line Items]
Notional Amount Liability	21,775	16,790
Derivatives liability, fair values	109	88
Accrued Expenses and Other Liabilities | Mandatory forward commitments
Derivatives, Fair Value [Line Items]
Notional Amount Liability	999,041	215,272
Derivatives liability, fair values	3,624	300
Accrued Expenses and Other Liabilities | Interest rate swaps on deposits and other borrowings
Derivatives, Fair Value [Line Items]
Notional Amount Liability	25,000	50,000
Derivatives liability, fair values	576	441
Accrued Expenses and Other Liabilities | Interest rate swaps and caps on loans with correspondent bank
Derivatives, Fair Value [Line Items]
Notional Amount Liability	27,140	27,467
Derivatives liability, fair values	285	238
Accrued Expenses and Other Liabilities | Foreign exchange contracts
Derivatives, Fair Value [Line Items]
Notional Amount Liability	10,366	0
Derivatives liability, fair values	$ 56	$ 0