FAIR VALUE MEASUREMENTS (Details 5) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Financial Assets
Securities available for sale	$ 466,169	$ 419,756
Accrued interest receivable	14,731	11,350
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	63,382
Securities available for sale	25,291
Financial Liabilities
Derivative liabilities	282
Level 2
Financial Assets
Securities available for sale	439,993
Restricted equity securities	39,785
Loans held for sale	85,368
Accrued interest receivable	14,731
Cash surrender value of bank-owned life insurance policies	88,198
Derivative assets	14,746
Financial Liabilities
Total deposits	4,116,999
Short-term debt	163,150
Long-term Federal Home Loan Bank advances	199,420
Subordinated notes	73,967
Derivative liabilities	29,818
Level 3
Financial Assets
Trading security	16,893
Securities available for sale	885
Securities held to maturity	51,024
Net loans	4,004,259
Derivative assets	6,258
Financial Liabilities
Derivative liabilities	1,055
Carrying Amount
Financial Assets
Cash and cash equivalents	63,382	75,359
Trading security	16,893	17,395
Securities available for sale	466,169	419,756
Securities held to maturity	51,024	58,912
Restricted equity securities	39,785	37,118
Net loans	3,955,446	2,924,126
Loans held for sale	85,368	1,455
Accrued interest receivable	14,731	11,350
Cash surrender value of bank-owned life insurance policies	88,198	75,009
Derivative assets	21,004	13,926
Financial Liabilities
Total deposits	4,104,402	3,101,175
Short-term debt	163,150	10,000
Long-term Federal Home Loan Bank advances	195,321	211,938
Subordinated notes	89,617	15,464
Derivative liabilities	31,155	26,930
Fair Value
Financial Assets
Cash and cash equivalents	63,382	75,359
Trading security	16,893	17,395
Securities available for sale	466,169	419,756
Securities held to maturity	51,024	60,395
Restricted equity securities	39,785	37,118
Net loans	4,004,259	2,990,173
Loans held for sale	85,368	1,455
Accrued interest receivable	14,731	11,350
Cash surrender value of bank-owned life insurance policies	88,198	75,009
Derivative assets	21,004	13,926
Financial Liabilities
Total deposits	4,116,999	3,104,204
Short-term debt	163,150	10,000
Long-term Federal Home Loan Bank advances	199,420	215,008
Subordinated notes	73,967	11,436
Derivative liabilities	$ 31,155	$ 26,930