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FEDERAL HOME LOAN BANK ADVANCES AND OTHER BORROWINGS - Additional Information (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Banking and Thrift [Abstract]    
Fixed bank advances $ 200,000 $ 400,000
Fixed bank advances interest rate 0.89%  
Variable bank advances $ 730,000 $ 233,000
Company advances weighted average interest rate 0.27%  
Interest rate of Company's advances, minimum   0.19%
Interest rate of Company's advances, maximum   0.82%
Weighted average rate of Company's advances   0.31%
FHLB variable-rate, weighted average interest rate   0.27%
Advances from FHLB collateralized $ 3,380,000 $ 1,840,000
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]    
Amount of additional available borrowing 1,290,000  
Federal Reserve Bank Advances    
Line of Credit Facility [Line Items]    
Amount of available line of credit with Federal Reserve Bank 89,700  
Federal Home Loan Bank of San Francisco    
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]    
FHLB stock $ 39,200 $ 29,800