LOANS (Details 7) (USD $)	Sep. 30, 2011	Dec. 31, 2010
Purchased credit-impaired loans and non-credit-impaired loans
Covered loans	$ 718,566,000	$ 812,330,000
Estimated reimbursable amounts from the FDIC under the loss-share agreement	94,542,000	215,460,000
Non covered loans	29,529,000
Outstanding balances on purchased loans from the FDIC	883,000,000	1,100,000,000
Carrying amount on loans purchased from the FDIC	748,100,000	894,500,000
Commercial related
Purchased credit-impaired loans and non-credit-impaired loans
Covered loans	55,935,000
Non covered loans	22,843,000
Commercial related | Purchased Credit-Impaired Loans Receivable
Purchased credit-impaired loans and non-credit-impaired loans
Covered loans	35,079,000
Non covered loans	(5,999,000)
Commercial related | Purchased Non-Credit Impaired Loans Receivable
Purchased credit-impaired loans and non-credit-impaired loans
Covered loans	20,856,000
Non covered loans	16,844,000
Commercial loans
Purchased credit-impaired loans and non-credit-impaired loans
Covered loans	41,209,000
Commercial loans | Purchased Credit-Impaired Loans Receivable
Purchased credit-impaired loans and non-credit-impaired loans
Covered loans	15,963,000
Commercial loans | Purchased Non-Credit Impaired Loans Receivable
Purchased credit-impaired loans and non-credit-impaired loans
Covered loans	25,246,000
Commercial real estate
Purchased credit-impaired loans and non-credit-impaired loans
Covered loans	348,737,000
Commercial real estate | Purchased Credit-Impaired Loans Receivable
Purchased credit-impaired loans and non-credit-impaired loans
Covered loans	151,203,000
Commercial real estate | Purchased Non-Credit Impaired Loans Receivable
Purchased credit-impaired loans and non-credit-impaired loans
Covered loans	197,534,000
Construction real estate
Purchased credit-impaired loans and non-credit-impaired loans
Covered loans	214,316,000
Construction real estate | Purchased Credit-Impaired Loans Receivable
Purchased credit-impaired loans and non-credit-impaired loans
Covered loans	188,271,000
Construction real estate | Purchased Non-Credit Impaired Loans Receivable
Purchased credit-impaired loans and non-credit-impaired loans
Covered loans	26,045,000
Other
Purchased credit-impaired loans and non-credit-impaired loans
Covered loans	58,369,000
Non covered loans	6,686,000
Other | Purchased Credit-Impaired Loans Receivable
Purchased credit-impaired loans and non-credit-impaired loans
Covered loans	6,968,000
Non covered loans	104,000
Other | Purchased Non-Credit Impaired Loans Receivable
Purchased credit-impaired loans and non-credit-impaired loans
Covered loans	51,401,000
Non covered loans	6,582,000
Purchased Credit-Impaired Loans Receivable
Purchased credit-impaired loans and non-credit-impaired loans
Covered loans	397,484,000
Estimated reimbursable amounts from the FDIC under the loss-share agreement	76,664,000
Non covered loans	6,103,000
Purchased Non-Credit Impaired Loans Receivable
Purchased credit-impaired loans and non-credit-impaired loans
Covered loans	321,082,000
Estimated reimbursable amounts from the FDIC under the loss-share agreement	17,878,000
Non covered loans	$ 23,426,000