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FEDERAL HOME LOAN BANK ADVANCES AND OTHER BORROWINGS - Additional Information (Detail) - USD ($)
Mar. 30, 2015
Jun. 30, 2015
Dec. 31, 2014
Banking and Thrift [Abstract]      
Fixed bank advances   $ 300,000,000 $ 400,000,000
Interest rate of Company's advances, minimum   0.30% 0.19%
Interest rate of Company's advances, maximum   0.34% 0.82%
Weighted average rate of Company's advances   0.32% 0.31%
Variable bank advances   $ 50,000,000 $ 233,000,000
FHLB variable-rate, weighted average interest rate   0.24% 0.27%
Advances from FHLB collateralized   $ 1,770,000,000 $ 1,840,000,000
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]      
Amount of additional available borrowing   1,020,000,000  
Line of Credit Facility [Line Items]      
Potential borrowings under repurchase agreement   403,900,000  
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 March 28, 2016 | Line of Credit      
Line of Credit Facility [Line Items]      
Line of credit facility $ 20,000,000    
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%    
Federal Reserve Bank Advances      
Line of Credit Facility [Line Items]      
Line of credit facility   111,800,000  
Collateral on line of credit facility   149,700,000  
Other borrowings   0  
Federal Home Loan Bank of San Francisco      
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]      
FHLB stock   $ 17,300,000 $ 29,800,000