TIME DEPOSITS AND SHORT-TERM DEBT (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Short-term Debt [Line Items]
Certificates of deposits and other time deposits over $100,000 outstanding	$ 1,100,000,000	$ 1,200,000,000
Interest expense relating to certificate and other time deposits of $100,000 or more	16,000,000	20,800,000	28,700,000
Maturities of time deposits [Abstract]
2015	363,800,000
2016	149,942,000
2017	135,020,000
2018	121,699,000
2019	1,000
Thereafter	173,000
Total	770,635,000
End of Period Balance	421,028,000	414,611,000	375,433,000
Daily Average Balance	418,119,000	382,104,000	437,511,000
Maximum Outstanding at any Month End	473,753,000	425,053,000	495,880,000
Lines of credit with other banks	689,000
Federal Funds Purchased [Member]
Maturities of time deposits [Abstract]
Daily Average Balance	1,238,000	1,180,000
Daily Average Interest Rate (in hundredths)	0.33%	0.32%
Period from date of sale that securities generally mature	30 days
Securities Sold Under Agreements to Repurchase [Member]
Maturities of time deposits [Abstract]
End of Period Balance	421,028,000	414,611,000	373,933,000
End of Period Interest Rate (in hundredths)	0.07%	0.07%	0.07%
Daily Average Balance	416,881,000	379,871,000	435,931,000
Daily Average Interest Rate (in hundredths)	0.07%	0.07%	0.10%
Maximum Outstanding at any Month End	473,753,000	423,553,000	493,157,000
Federal Reserve Bank Advances [Member]
Maturities of time deposits [Abstract]
Period from date of purchase that borrowings generally mature	90 days
Federal Home Loan Bank [Member]
Maturities of time deposits [Abstract]
End of Period Balance			1,500,000
End of Period Interest Rate (in hundredths)			4.71%
Daily Average Balance		1,053,000	1,580,000
Daily Average Interest Rate (in hundredths)		4.71%	5.72%
Maximum Outstanding at any Month End		$ 1,500,000	$ 2,723,000
Period from date of purchase that borrowings generally mature	30 days