DERIVATIVE INSTRUMENTS (Details) (USD $)	Dec. 31, 2011	Dec. 31, 2010
Derivative [Line Items]
Notional amount	$ 493,300,000	$ 514,800,000
Average maturity (in months)	62.3M	73.4M
Average interest receive rate (in hundredths)	2.60%	2.50%
Average interest pay rate (in hundredths)	5.90%	6.10%
Forward Commitments to Sell Fixed-Rate Mortgage Loans [Member]
Derivative [Line Items]
Notional amount	107,000,000	151,300,000
Difference in carrying value and fair value, reflecting a loss	1,100,000	2,500,000
Commitments To Fund Fixed-Rate Mortgage Loans [Member]
Derivative [Line Items]
Notional amount	104,200,000	70,100,000
Difference in carrying value and fair value, reflecting a gain	2,100,000	639,000
Interest Rate Swap [Member]
Derivative [Line Items]
Notional amount	$ 493,300,000
Average maturity (in months)	62.3M
Average interest receive rate (in hundredths)	2.60%
Average interest pay rate (in hundredths)	5.90%