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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
Dec. 31, 2016
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]      
Fixed bank advances $ 200,000,000 $ 200,000,000 $ 150,000,000
Variable bank advances $ 670,000,000 $ 670,000,000 $ 340,000,000
FHLB variable-rate, weighted average interest rate 1.07% 1.07% 0.52%
Line of Credit Facility [Line Items]      
Advances from FHLB collateralized $ 2,510,000,000 $ 2,510,000,000 $ 3,270,000,000
Other borrowings 0 0 67,922,000
Securities sold under repurchase agreements 53,242,000 53,242,000 0
Line of Credit | Unsecured Federal Funds Line of Credit      
Line of Credit Facility [Line Items]      
Line of credit facility 210,000,000 210,000,000  
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%  
Securities      
Line of Credit Facility [Line Items]      
Advances from FHLB collateralized 422,800,000 $ 422,800,000 321,000,000
Federal Reserve Bank Advances      
Line of Credit Facility [Line Items]      
Line of credit facility 187,300,000 187,300,000  
Other borrowings 0 0  
Federal Reserve Bank Advances | Securities      
Line of Credit Facility [Line Items]      
Collateral on line of credit facility 208,200,000 208,200,000  
Federal Home Loan Bank of San Francisco      
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]      
FHLB stock 36,600,000 36,600,000 $ 41,900,000
Amount of additional available borrowing 1,360,000,000 1,360,000,000  
Collateralized loan obligations      
Line of Credit Facility [Line Items]      
Fair value of securities sold under repurchase agreements 35,200,000 35,200,000  
Commercial mortgage-backed securities      
Line of Credit Facility [Line Items]      
Fair value of securities sold under repurchase agreements $ 26,200,000 $ 26,200,000  
Minimum      
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]      
FHLB fixed interest rate 0.86% 0.86% 0.69%
Line of Credit Facility [Line Items]      
Securities sold under repurchase agreements, interest rate 2.05% 2.05%  
Maximum      
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]      
FHLB fixed interest rate 3.00% 3.00% 1.61%
Line of Credit Facility [Line Items]      
Securities sold under repurchase agreements, interest rate 2.21% 2.21%  
Weighted Average      
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]      
FHLB fixed interest rate 2.08% 2.08% 1.02%
Line of Credit Facility [Line Items]      
Securities sold under repurchase agreements, interest rate 2.12% 2.12%