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FEDERAL HOME LOAN BANK ADVANCES AND OTHER BORROWINGS - Additional Information (Details) - USD ($)
Jun. 30, 2017
Dec. 31, 2017
Dec. 31, 2016
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]      
Fixed bank advances   $ 550,000,000 $ 150,000,000
Company advances weighted average interest rate   1.40%  
Variable bank advances   $ 1,145,000,000 $ 340,000,000
FHLB variable-rate, weighted average interest rate     0.52%
Advances from FHLB collateralized   2,900,000,000 $ 3,270,000,000
Amount of additional available borrowing   873,100,000  
Line of Credit Facility [Line Items]      
Other borrowings   0 67,922,000
Securities sold under repurchase agreements   0 0
Federal Reserve Bank Advances      
Line of Credit Facility [Line Items]      
Amount of available line of credit with Federal Reserve Bank   63,200,000  
Other borrowings   0  
Securities Pledged as Collateral      
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]      
Advances from FHLB collateralized   405,600,000 321,000,000
Securities Pledged as Collateral | Federal Reserve Bank Advances      
Line of Credit Facility [Line Items]      
Collateral on line of credit facility   101,200,000  
Line of Credit | Unsecured Federal Funds Line of Credit      
Line of Credit Facility [Line Items]      
Amount of available line of credit with Federal Reserve Bank   210,000,000  
Line of Credit | Line Of Credit Facility Maturing April 18, 2017      
Line of Credit Facility [Line Items]      
Amount of available line of credit with Federal Reserve Bank $ 75,000,000    
Repayments of lines of credit $ 50,000,000    
Federal Home Loan Bank of San Francisco      
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]      
FHLB stock   $ 48,700,000 $ 41,900,000
London Interbank Offered Rate (LIBOR) | Line of Credit | Line of Credit Facility Maturing March 28, 2016      
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]      
Company advances weighted average interest rate   1.23% 0.69%
Maximum      
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]      
Company advances weighted average interest rate   3.00% 1.61%
Weighted Average      
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]      
Company advances weighted average interest rate   2.02% 1.02%