COMMITMENTS AND CONTINGENT LIABILITIES (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Leases [Abstract]
Rent expense	$ 7,200,000	$ 7,100,000	$ 6,900,000
Future minimum lease payments [Abstract]
2013	5,072,000
2014	2,918,000
2015	2,184,000
2016	1,597,000
2017	1,215,000
Thereafter	4,377,000
Total future minimum lease payments	17,363,000
Mortgage loans serviced for others [Abstract]
Loans serviced for investors	5,058,912,000	4,293,552,000	3,870,872,000
Primary Recourse Servicing Loans [Member]
Mortgage loans serviced for others [Abstract]
Off-balance sheet, face amount of asset	2,500,000
Letters of Credit [Member]
Lending commitments [Abstract]
Off-balance sheet, face amount of liability	130,900,000
Interim Mortgage Financing, Construction Credit, Credit Card and Revolving Line of Credit Arrangements [Member]
Lending commitments [Abstract]
Off-balance sheet, face amount of liability	$ 2,000,000,000