DERIVATIVE INSTRUMENTS (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Derivative [Line Items]
Notional amount	$ 496,200,000	$ 493,300,000
Average maturity	59 months 27 days	62 months 9 days
Average interest receive rate (in hundredths)	2.50%	2.60%
Average interest pay rate (in hundredths)	5.70%	5.90%
Forward Commitments to Sell Fixed-Rate Mortgage Loans [Member]
Derivative [Line Items]
Notional amount	231,200,000	107,000,000
Difference in carrying value and fair value, reflecting a loss	536,000	1,100,000
Commitments To Fund Fixed-Rate Mortgage Loans [Member]
Derivative [Line Items]
Notional amount	198,300,000	104,200,000
Difference in carrying value and fair value, reflecting a gain	$ 4,100,000	$ 2,100,000