FAIR VALUE MEASUREMENTS (Details 5) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Dec. 31, 2013
Financial Assets
Trading security	$ 14,971	$ 14,840
Securities available for sale	1,080,668	760,048
Securities held to maturity	44,359	45,764
Financial Liabilities
Derivative liabilities	12,882	13,877
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	81,642	75,539
Securities available for sale	46,465	20,891
Derivative assets		242
Financial Liabilities
Derivative liabilities	398
Level 2
Financial Assets
Securities available for sale	1,031,986	737,193
Restricted equity securities	59,479	50,282
Loans held for sale	20,185	15,840
Accrued interest receivable	16,126	15,072
Cash surrender value of bank-owned life insurance policies	102,988	101,530
Derivative assets	9,538	7,799
Assets held for sale	2,120	3,969
Financial Liabilities
Total deposits	4,478,880	3,848,926
Short-term debt	900,126	872,545
Long-term Federal Home Loan Bank advances	65,909	103,660
Subordinated borrowings	88,070	87,882
Derivative liabilities	12,917	11,964
Liabilities held for sale	24,171	24,834
Level 3
Financial Assets
Trading security	14,971	14,840
Securities available for sale	2,217	1,964
Securities held to maturity	44,359	45,764
Net loans	4,469,300	4,154,663
Derivative assets	660	277
Financial Liabilities
Derivative liabilities	163
Carrying Amount
Financial Assets
Cash and cash equivalents	81,642	75,539
Trading security	14,971	14,840
Securities available for sale	1,080,668	760,048
Securities held to maturity	43,178	44,921
Restricted equity securities	59,479	50,282
Net loans	4,415,950	4,147,200
Loans held for sale	20,185	15,840
Accrued interest receivable	16,126	15,072
Cash surrender value of bank-owned life insurance policies	102,988	101,530
Derivative assets	10,198	8,318
Assets held for sale	2,120	3,969
Financial Liabilities
Total deposits	4,478,563	3,848,529
Short-term debt	900,000	872,510
Long-term Federal Home Loan Bank advances	64,179	101,918
Subordinated borrowings	89,713	89,679
Derivative liabilities	13,478	11,964
Liabilities held for sale	24,171	24,834
Fair Value
Financial Assets
Cash and cash equivalents	81,642	75,539
Trading security	14,971	14,840
Securities available for sale	1,080,668	760,048
Securities held to maturity	44,359	45,764
Restricted equity securities	59,479	50,282
Net loans	4,469,300	4,154,663
Loans held for sale	20,185	15,840
Accrued interest receivable	16,126	15,072
Cash surrender value of bank-owned life insurance policies	102,988	101,530
Derivative assets	10,198	8,318
Assets held for sale	2,120	3,969
Financial Liabilities
Total deposits	4,478,880	3,848,926
Short-term debt	900,126	872,545
Long-term Federal Home Loan Bank advances	65,909	103,660
Subordinated borrowings	88,070	87,882
Derivative liabilities	13,478	11,964
Liabilities held for sale	$ 24,171	$ 24,834