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FEDERAL HOME LOAN BANK ADVANCES AND OTHER BORROWINGS - Additional Information (Detail) - USD ($)
 6 Months Ended
Jun. 30, 2017
Jun. 30, 2017
Sep. 30, 2017
Dec. 31, 2016
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]        
Fixed bank advances     $ 700,000,000 $ 150,000,000
Variable bank advances     $ 770,000,000 $ 340,000,000
FHLB variable-rate, weighted average interest rate     1.14% 0.52%
Line of Credit Facility [Line Items]        
Advances from FHLB collateralized     $ 2,710,000,000 $ 3,270,000,000
Other borrowings     0 67,922,000
Securities sold under repurchase agreements     36,520,000 0
Line of Credit | Unsecured Federal Funds Line of Credit        
Line of Credit Facility [Line Items]        
Line of credit facility     210,000,000  
Line of Credit | Line Of Credit Facility Maturing April 18, 2017        
Line of Credit Facility [Line Items]        
Line of credit facility $ 75,000,000 $ 75,000,000    
Repayment of line of credit $ 50,000,000      
Line of Credit | Line of Credit Facility Maturing March 28, 2016 | London Interbank Offered Rate (LIBOR)        
Line of Credit Facility [Line Items]        
Basis spread on variable rate   2.25%    
Collateralized loan obligations        
Line of Credit Facility [Line Items]        
Fair value of securities sold under repurchase agreements     46,300,000  
Federal Reserve Bank Advances        
Line of Credit Facility [Line Items]        
Line of credit facility     124,700,000  
Other borrowings     0  
Federal Home Loan Bank of San Francisco        
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]        
FHLB stock     40,200,000 $ 41,900,000
Amount of additional available borrowing     $ 918,200,000  
Minimum        
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]        
FHLB fixed interest rate     1.15% 0.69%
Line of Credit Facility [Line Items]        
Securities sold under repurchase agreements, interest rate     2.33%  
Maximum        
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]        
FHLB fixed interest rate     3.00% 1.61%
Line of Credit Facility [Line Items]        
Securities sold under repurchase agreements, interest rate     2.78%  
Weighted Average        
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]        
FHLB fixed interest rate     1.45% 1.02%
Line of Credit Facility [Line Items]        
Securities sold under repurchase agreements, interest rate     2.51%  
Securities        
Line of Credit Facility [Line Items]        
Advances from FHLB collateralized     $ 416,100,000 $ 321,000,000
Securities | Federal Reserve Bank Advances        
Line of Credit Facility [Line Items]        
Collateral on line of credit facility     $ 183,300,000