FINANCIAL INSTRUMENTS WITH OFF BALANCE SHEET RISK (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended		3 Months Ended	9 Months Ended	12 Months Ended	3 Months Ended		9 Months Ended	12 Months Ended	3 Months Ended		9 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended	3 Months Ended		9 Months Ended			3 Months Ended	9 Months Ended	3 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2011 Pay Fixed Receive Floating Interest Rate Swaps [Member]	Sep. 30, 2011 Pay Fixed Receive Floating Interest Rate Swaps [Member]	Dec. 31, 2011 Pay Fixed Receive Floating Interest Rate Swaps [Member]	Sep. 30, 2012 Interest rate locks [Member] Mortgage Banking Income [Member]	Sep. 30, 2011 Interest rate locks [Member] Mortgage Banking Income [Member]	Sep. 30, 2011 Interest rate locks [Member] Mortgage Banking Income [Member]	Dec. 31, 2011 Interest rate locks [Member] Other Assets [Member]	Sep. 30, 2012 Forward Sale Commitments [Member] Mortgage Banking Income [Member]	Sep. 30, 2011 Forward Sale Commitments [Member] Mortgage Banking Income [Member]	Sep. 30, 2011 Forward Sale Commitments [Member] Mortgage Banking Income [Member]	Dec. 31, 2011 Forward Sale Commitments [Member] Other Liabilities [Member]	Sep. 30, 2012 Interest Rate Swaps [Member]	Dec. 31, 2011 Interest Rate Swaps [Member]	Sep. 30, 2012 Interest Rate Swaps [Member] Other Operating Income [Member]	Sep. 30, 2011 Interest Rate Swaps [Member] Other Operating Income [Member]	Sep. 30, 2012 Interest Rate Swaps [Member] Other Operating Income [Member]	Sep. 30, 2011 Interest Rate Swaps [Member] Other Operating Income [Member]	Sep. 30, 2012 Other Derivatives [Member] Interest rate locks [Member] Mortgage Banking Income [Member]	Sep. 30, 2012 Other Derivatives [Member] Interest rate locks [Member] Other Assets [Member]	Sep. 30, 2012 Other Derivatives [Member] Forward Sale Commitments [Member] Mortgage Banking Income [Member]	Sep. 30, 2012 Other Derivatives [Member] Forward Sale Commitments [Member] Other Liabilities [Member]	Sep. 30, 2012 Not Designated as Hedging Instrument [Member] Net Interest Rate Swaps [Member]	Dec. 31, 2011 Not Designated as Hedging Instrument [Member] Net Interest Rate Swaps [Member]	Sep. 30, 2012 Not Designated as Hedging Instrument [Member] Receive Fixed Pay Floating Interest Rate Swaps [Member]	Dec. 31, 2011 Not Designated as Hedging Instrument [Member] Receive Fixed Pay Floating Interest Rate Swaps [Member]	Sep. 30, 2012 Not Designated as Hedging Instrument [Member] Pay Fixed Receive Floating Interest Rate Swaps [Member]	Dec. 31, 2011 Not Designated as Hedging Instrument [Member] Pay Fixed Receive Floating Interest Rate Swaps [Member]	Sep. 30, 2012 Commitments to Extend Credit [Member]	Dec. 31, 2011 Commitments to Extend Credit [Member]	Sep. 30, 2012 Commitments to Fund Mortgages [Member]	Dec. 31, 2011 Commitments to Fund Mortgages [Member]	Sep. 30, 2012 Commitments to Sell Mortgages to Investors [Member]	Dec. 31, 2011 Commitments to Sell Mortgages to Investors [Member]	Sep. 30, 2012 Letters of Credit [Member]	Dec. 31, 2011 Letters of Credit [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Contract or notional amount																														$ 1,569,747	$ 1,452,348	$ 51,776	$ 27,067	$ 74,479	$ 39,283	$ 142,752	$ 157,240
Derivative instrument detail [Abstract]
Positions (in ones)																										113	78	113	78
Receive rate (in hundredths)																								3.68%	4.01%	5.08%	5.90%	2.29%	2.11%
Pay rate (in hundredths)																								3.68%	4.01%	2.29%	2.11%	5.08%	5.90%
Life (in years)																								5 years 9 months 0 days	5 years 0 months 11 days	5 years 9 months 0 days	5 years 0 months 11 days	5 years 9 months 0 days	5 years 0 months 11 days
Not designated as hedge [Abstract]
Notional amount																								765,138	390,526	382,569	195,263	382,569	195,263
Asset																								29,280	22,598	29,280	22,598	0	0
Liability																								29,280	22,598	0	0	29,280	22,598
Balance Sheet Related Disclosures [Abstract]
Increase (Decrease) in Derivative Assets and Liabilities					0
Increase (Decrease) in Other Operating Assets	(4,155)	(14,285)							600					29,300	22,600						500
Increase (decrease) in other liabilities	1,780	(4,607)											900	29,300	22,600								1,000
Income Statement Effect [Abstract]
Gain (loss) recognized in income, ineffective portion			0	0
Interest expense from Deriviative			600	1,700
Gain recognized in income							1,100	400		200
Loss recognized in income						300					1,400	800								100		200
Offsetting change having no net effect on other operating income																$ 3,400	$ 4,600	$ 6,700	$ 4,100