DEPOSITS - Brokered Certificates Of Deposit Mature (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Deposits [Line Items]
Interest Bearing Domestic Deposit Brokered	$ 1,255,259	$ 1,439,697
One to ninety days
Deposits [Line Items]
Interest Bearing Domestic Deposit Brokered	203,112
Over three month to six months
Deposits [Line Items]
Interest Bearing Domestic Deposit Brokered	194,631
Over six months to one year
Deposits [Line Items]
Interest Bearing Domestic Deposit Brokered	282,118
One to three year
Deposits [Line Items]
Interest Bearing Domestic Deposit Brokered	426,394
Three to five years
Deposits [Line Items]
Interest Bearing Domestic Deposit Brokered	147,624
Over five years
Deposits [Line Items]
Interest Bearing Domestic Deposit Brokered	$ 1,380