FAIR VALUE MEASUREMENTS (Details 3) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Assets, Fair Value Disclosure [Abstract]
Held-to-maturity Securities	$ 375,453	$ 350,652
Loans and Leases Receivable, Net Amount	4,915,633	4,665,068
Securities held to maturity	379,699	346,455
Liabilities, Fair Value Disclosure [Abstract]
Advances from Federal Home Loan Banks	70,080	140,294
Customer Repurchase Agreements and other short-term borrowings	147,890	154,288
Wholesale Repurchase Agreements	50,000	50,000
Junior subordinated debentures	73,685	73,906
Subordinated Debt	65,000	30,000
Bank Time Deposits [Member]
Liabilities, Fair Value Disclosure [Abstract]
Financial Liabilities Book Value	649,620	743,628
Accrued Liabilities, Fair Value Disclosure	651,180	746,908
Federal Home Loan Bank Advances [Member]
Liabilities, Fair Value Disclosure [Abstract]
Advances from Federal Home Loan Banks	70,080	140,294
Accrued Liabilities, Fair Value Disclosure	70,208	140,321
Customer Repurchase Agreements [Member]
Liabilities, Fair Value Disclosure [Abstract]
Customer Repurchase Agreements and other short-term borrowings	147,890	154,288
Accrued Liabilities, Fair Value Disclosure	147,890	154,349
Wholesaled And Customer Repurchase Agreements [Member]
Liabilities, Fair Value Disclosure [Abstract]
Wholesale Repurchase Agreements	50,000	50,000
Accrued Liabilities, Fair Value Disclosure	50,510	51,298
Junior Subordinated Debt [Member]
Liabilities, Fair Value Disclosure [Abstract]
Junior subordinated debentures	73,685	73,906
Accrued Liabilities, Fair Value Disclosure	70,045	67,481
Subordinated Debt [Member]
Liabilities, Fair Value Disclosure [Abstract]
Subordinated Debt	65,000	30,000
Accrued Liabilities, Fair Value Disclosure	64,198	28,396
Significant Other Observable Inputs (Level 2) [Member] | Bank Time Deposits [Member]
Liabilities, Fair Value Disclosure [Abstract]
Accrued Liabilities, Fair Value Disclosure	651,180	746,908
Significant Other Observable Inputs (Level 2) [Member] | Federal Home Loan Bank Advances [Member]
Liabilities, Fair Value Disclosure [Abstract]
Accrued Liabilities, Fair Value Disclosure	70,208	140,321
Significant Other Observable Inputs (Level 2) [Member] | Junior Subordinated Debt [Member]
Liabilities, Fair Value Disclosure [Abstract]
Accrued Liabilities, Fair Value Disclosure	70,045	67,481
Significant Unobservable Inputs (Level 3) [Member] | Customer Repurchase Agreements [Member]
Liabilities, Fair Value Disclosure [Abstract]
Accrued Liabilities, Fair Value Disclosure	147,890	154,349
Significant Unobservable Inputs (Level 3) [Member] | Wholesaled And Customer Repurchase Agreements [Member]
Liabilities, Fair Value Disclosure [Abstract]
Accrued Liabilities, Fair Value Disclosure	50,510	51,298
Significant Unobservable Inputs (Level 3) [Member] | Subordinated Debt [Member]
Liabilities, Fair Value Disclosure [Abstract]
Accrued Liabilities, Fair Value Disclosure	64,198	28,396
US Treasury Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Held-to-maturity Securities	1,010	1,011
Securities held to maturity	1,073	1,042
US Treasury Securities [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets, Fair Value Disclosure [Abstract]
Securities held to maturity	1,073	1,042
Agency mortgage-backed securities
Assets, Fair Value Disclosure [Abstract]
Held-to-maturity Securities	159,522	155,067
Securities held to maturity	164,944	155,951
Agency mortgage-backed securities | Significant Other Observable Inputs (Level 2) [Member]
Assets, Fair Value Disclosure [Abstract]
Securities held to maturity	164,944	155,951
Agency collateralized mortgage obligations
Assets, Fair Value Disclosure [Abstract]
Held-to-maturity Securities	207,995	187,388
Securities held to maturity	206,658	182,036
Agency collateralized mortgage obligations | Significant Other Observable Inputs (Level 2) [Member]
Assets, Fair Value Disclosure [Abstract]
Securities held to maturity	206,658	182,036
State, county, and municipal securities
Assets, Fair Value Disclosure [Abstract]
Held-to-maturity Securities	424	678
Securities held to maturity	428	685
State, county, and municipal securities | Significant Other Observable Inputs (Level 2) [Member]
Assets, Fair Value Disclosure [Abstract]
Securities held to maturity	428	685
Single issuer trust preferred securities issued by banks and insurers
Assets, Fair Value Disclosure [Abstract]
Held-to-maturity Securities	1,500	1,503
Securities held to maturity	1,477	1,526
Single issuer trust preferred securities issued by banks and insurers | Significant Other Observable Inputs (Level 2) [Member]
Assets, Fair Value Disclosure [Abstract]
Securities held to maturity	1,477	1,526
Corporate Debt Securities [Member]
Assets, Fair Value Disclosure [Abstract]
Held-to-maturity Securities	5,002	5,005
Securities held to maturity	5,119	5,215
Corporate Debt Securities [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets, Fair Value Disclosure [Abstract]
Securities held to maturity	5,119	5,215
Loans Net Of Allowance For Loan Loses [Member]
Assets, Fair Value Disclosure [Abstract]
Loans and Leases Receivable, Net Amount	4,915,633	4,665,068
Loans, net of allowance for loan losses	4,883,479	4,655,920
Loans Net Of Allowance For Loan Loses [Member] | Significant Unobservable Inputs (Level 3) [Member]
Assets, Fair Value Disclosure [Abstract]
Loans, net of allowance for loan losses	$ 4,883,479	$ 4,655,920