FAIR VALUE MEASUREMENTS (Details 5) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Dec. 31, 2011
Financial Assets
Securities available for sale	$ 467,444	$ 419,756
Methods and assumptions used to estimate the fair value of significant classes of financial instruments
Junior subordinated debentures re-price period	90 days
Level 1
Financial Assets
Cash and cash equivalents	48,214
Securities available for sale	31,085
Financial Liabilities
Derivative liabilities	4,669
Level 2
Financial Assets
Securities available for sale	435,542
Restricted equity securities	37,135
Loans held for sale	114,698
Accrued interest receivable	13,640
Cash surrender value of bank-owned life insurance policies	76,904
Derivative assets	15,747
Financial Liabilities
Total deposits	3,464,962
Short-term debt	61,800
Long-term Federal Home Loan Bank advances	393,703
Junior subordinated debentures	87,901
Derivative liabilities	32,244
Level 3
Financial Assets
Trading security	17,237
Securities available for sale	817
Securities held to maturity	52,892
Net loans	3,411,331
Derivative assets	7,832
Carrying Amount
Financial Assets
Cash and cash equivalents	48,214	75,359
Trading security	17,237	17,395
Securities available for sale	467,444	419,756
Securities held to maturity	51,156	58,912
Restricted equity securities	37,135	37,118
Net loans	3,385,302	2,924,126
Loans held for sale	114,698	1,455
Accrued interest receivable	13,640	11,350
Cash surrender value of bank-owned life insurance policies	76,904	75,009
Derivative assets	23,579	13,926
Financial Liabilities
Total deposits	3,453,363	3,101,175
Short-term debt	61,800	10,000
Long-term Federal Home Loan Bank advances	388,999	211,938
Junior subordinated debentures	89,602	15,464
Derivative liabilities	36,913	26,930
Fair Value
Financial Assets
Cash and cash equivalents	48,214	75,359
Trading security	17,237	17,395
Securities available for sale	467,444	419,756
Securities held to maturity	52,892	60,395
Restricted equity securities	37,135	37,118
Net loans	3,411,331	2,990,173
Loans held for sale	114,698	1,455
Accrued interest receivable	13,640	11,350
Cash surrender value of bank-owned life insurance policies	76,904	75,009
Derivative assets	23,579	13,926
Financial Liabilities
Total deposits	3,464,962	3,104,204
Short-term debt	61,800	10,000
Long-term Federal Home Loan Bank advances	393,703	215,008
Junior subordinated debentures	87,901	11,436
Derivative liabilities	$ 36,913	$ 26,930