SHORT-TERM BORROWINGS (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Short-term Debt [Line Items]
Short-term borrowings	$ 615,222	$ 546,597
Master Notes [Member]
Short-term Debt [Line Items]
Short-term borrowings	375,396	371,350
Repurchase Agreements [Member]
Short-term Debt [Line Items]
Short-term borrowings	172,275	78,274
Federal Home Loan Bank Advances [Member]
Short-term Debt [Line Items]
Short-term borrowings	65,000	82,000
Federal Funds Purchased [Member]
Short-term Debt [Line Items]
Short-term borrowings	2,551	2,551
Other Loans [Member]
Short-term Debt [Line Items]
Short-term borrowings	0	12,422
Unsecured Debt [Member]
Short-term Debt [Line Items]
Line of Credit Facility, Remaining Borrowing Capacity	450,000
Secured Debt [Member]
Short-term Debt [Line Items]
Line of Credit Facility, Remaining Borrowing Capacity	$ 963,473