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FEDERAL HOME LOAN BANK ADVANCES AND OTHER BORROWINGS - Additional Information (Detail) - USD ($)
 6 Months Ended
Jun. 30, 2016
Dec. 31, 2015
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]    
Fixed bank advances $ 750,000,000 $ 200,000,000
Variable bank advances $ 180,000,000 $ 730,000,000
FHLB variable-rate, weighted average interest rate 0.47% 0.27%
Advances from FHLB collateralized $ 3,890,000,000 $ 3,380,000,000
Line of Credit    
Line of Credit Facility [Line Items]    
Unused repurchase agreements (up to $1.00 billion) 1,000,000,000  
Federal Home Loan Bank of San Francisco    
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]    
FHLB stock 58,600,000 $ 39,200,000
Amount of additional available borrowing 2,170,000,000  
Unsecured Federal Funds Line of Credit | Line of Credit    
Line of Credit Facility [Line Items]    
Line of credit facility 85,000,000  
Line Of Credit Facility Maturing April 18, 2017 | Line of Credit    
Line of Credit Facility [Line Items]    
Line of credit facility 75,000,000  
Line of Credit Facility Maturing March 28, 2016 | Line of Credit    
Line of Credit Facility [Line Items]    
Other borrowings $ 0  
Line of Credit Facility Maturing March 28, 2016 | Line of Credit | London Interbank Offered Rate (LIBOR)    
Line of Credit Facility [Line Items]    
Basis spread on variable rate 2.25%  
Minimum    
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]    
FHLB fixed interest rate 0.38% 0.50%
Maximum    
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]    
FHLB fixed interest rate 1.61% 1.61%
Weighted Average    
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]    
FHLB fixed interest rate 0.51% 0.89%
Federal Reserve Bank Advances    
Line of Credit Facility [Line Items]    
Line of credit facility $ 142,700,000  
Collateral on line of credit facility 38,800,000  
Other borrowings $ 0