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COMMITMENTS AND CONTINGENT LIABILITIES (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Leases [Abstract]      
Rent expense $ 8,000 $ 8,100 $ 7,900
Future minimum lease payments [Abstract]      
2016 6,939    
2017 4,883    
2018 3,806    
2019 2,856    
2020 2,608    
Thereafter 6,305    
Total future minimum lease payments 27,397    
Mortgage loans serviced for others [Abstract]      
Loans serviced for investors 6,384,649 $ 6,011,236 $ 5,686,756
Primary Recourse Servicing Loans [Member]      
Mortgage loans serviced for others [Abstract]      
Off-balance sheet, face amount of asset 3,100    
Letters of Credit [Member]      
Lending commitments [Abstract]      
Off-balance sheet, face amount of liability 88,200    
Interim Mortgage Financing, Construction Credit, Credit Card and Revolving Line of Credit Arrangements [Member]      
Lending commitments [Abstract]      
Off-balance sheet, face amount of liability $ 2,500,000