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DEPOSITS - Brokered Certificates Of Deposit Mature (Detail) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Deposits [Line Items]    
Interest Bearing Domestic Deposit Brokered $ 822,666 $ 1,150,485
One to ninety days    
Deposits [Line Items]    
Interest Bearing Domestic Deposit Brokered 148,917  
Over three month to six months    
Deposits [Line Items]    
Interest Bearing Domestic Deposit Brokered 180,053  
Over six months to one year    
Deposits [Line Items]    
Interest Bearing Domestic Deposit Brokered 128,815  
One to three year    
Deposits [Line Items]    
Interest Bearing Domestic Deposit Brokered 284,747  
Three to five years    
Deposits [Line Items]    
Interest Bearing Domestic Deposit Brokered 78,753  
Over five years    
Deposits [Line Items]    
Interest Bearing Domestic Deposit Brokered $ 1,381