FAIR VALUE MEASUREMENTS (Details 3) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012		Dec. 31, 2011
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities held to maturity		[1]
Loans, net of allowance for loan losses		[2]		[2]
Time certificates of deposits		[3]		[3]
Federal home loan bank advances and other borrowings		[3]		[3]
Wholesale and customer repurchase agreements		[3]		[3]
Junior subordinated debentures		[4]		[4]
Subordinated debentures		[3]		[3]
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | U.S. treasury securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities held to maturity		[1]		[1]
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Agency mortgage-backed securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities held to maturity		[1]		[1]
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Agency collateralized mortgage obligations [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities held to maturity		[1]		[1]
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | State, county, and municipal securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities held to maturity		[1]		[1]
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Single issuer trust preferred securities Issued by banks and insurers [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities held to maturity		[1]		[1]
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Corporate debt securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities held to maturity		[1]		[1]
Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities held to maturity		[1]
Loans, net of allowance for loan losses		[2]		[2]
Time certificates of deposits	759,516	[3]	639,333	[3]
Federal home loan bank advances and other borrowings	293,580	[3]	233,880	[3]
Wholesale and customer repurchase agreements		[3]		[3]
Junior subordinated debentures	74,416	[4]	60,620	[4]
Subordinated debentures		[3]		[3]
Significant Other Observable Inputs (Level 2) [Member] | U.S. treasury securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities held to maturity	1,134	[1]	1,117	[1]
Significant Other Observable Inputs (Level 2) [Member] | Agency mortgage-backed securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities held to maturity	76,593	[1]	113,959	[1]
Significant Other Observable Inputs (Level 2) [Member] | Agency collateralized mortgage obligations [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities held to maturity	100,380	[1]	80,298	[1]
Significant Other Observable Inputs (Level 2) [Member] | State, county, and municipal securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities held to maturity	926	[1]	3,610	[1]
Significant Other Observable Inputs (Level 2) [Member] | Single issuer trust preferred securities Issued by banks and insurers [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities held to maturity	1,526	[1]	7,346	[1]
Significant Other Observable Inputs (Level 2) [Member] | Corporate debt securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities held to maturity	5,265	[1]	5,164	[1]
Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities held to maturity		[1]
Loans, net of allowance for loan losses	4,462,580	[2]	3,807,938	[2]
Time certificates of deposits		[3]		[3]
Federal home loan bank advances and other borrowings		[3]		[3]
Wholesale and customer repurchase agreements	201,189	[3]	219,857	[3]
Junior subordinated debentures		[4]		[4]
Subordinated debentures	22,762	[3]	27,217	[3]
Significant Unobservable Inputs (Level 3) [Member] | U.S. treasury securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities held to maturity		[1]		[1]
Significant Unobservable Inputs (Level 3) [Member] | Agency mortgage-backed securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities held to maturity		[1]		[1]
Significant Unobservable Inputs (Level 3) [Member] | Agency collateralized mortgage obligations [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities held to maturity		[1]
Significant Unobservable Inputs (Level 3) [Member] | State, county, and municipal securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities held to maturity		[1]		[1]
Significant Unobservable Inputs (Level 3) [Member] | Single issuer trust preferred securities Issued by banks and insurers [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities held to maturity		[1]		[1]
Significant Unobservable Inputs (Level 3) [Member] | Corporate debt securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities held to maturity		[1]		[1]
Book Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities held to maturity		[1]
Loans, net of allowance for loan losses	4,467,177	[2]	3,746,130	[2]
Time certificates of deposits	753,125	[3]	630,162	[3]
Federal home loan bank advances and other borrowings	283,569	[3]	229,701	[3]
Wholesale and customer repurchase agreements	203,359	[3]	216,128	[3]
Junior subordinated debentures	74,127	[4]	61,857	[4]
Subordinated debentures	30,000	[3]	30,000	[3]
Book Value [Member] | U.S. treasury securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities held to maturity	1,013	[2]	1,014	[1]
Book Value [Member] | Agency mortgage-backed securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities held to maturity	72,360		109,553	[1]
Book Value [Member] | Agency collateralized mortgage obligations [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities held to maturity	97,507	[3]	77,804	[1]
Book Value [Member] | State, county, and municipal securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities held to maturity	915	[3]	3,576	[1]
Book Value [Member] | Single issuer trust preferred securities Issued by banks and insurers [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities held to maturity	1,516	[3]	8,000	[1]
Book Value [Member] | Corporate debt securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities held to maturity	5,007	[4]	5,009	[1]
Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities held to maturity		[1]
Loans, net of allowance for loan losses	4,462,580	[2]	3,807,938	[2]
Time certificates of deposits	759,516	[3]	639,333	[3]
Federal home loan bank advances and other borrowings	293,580	[3]	233,880	[3]
Wholesale and customer repurchase agreements	201,189	[3]	219,857	[3]
Junior subordinated debentures	74,416	[4]	60,620	[4]
Subordinated debentures	22,762	[3]	27,217	[3]
Fair Value [Member] | U.S. treasury securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities held to maturity	1,134	[1]	1,117	[1]
Fair Value [Member] | Agency mortgage-backed securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities held to maturity	76,593	[1]	113,959	[1]
Fair Value [Member] | Agency collateralized mortgage obligations [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities held to maturity	100,380	[1]	80,298	[1]
Fair Value [Member] | State, county, and municipal securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities held to maturity	926	[1]	3,610	[1]
Fair Value [Member] | Single issuer trust preferred securities Issued by banks and insurers [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities held to maturity	1,526	[1]	7,346	[1]
Fair Value [Member] | Corporate debt securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities held to maturity	$ 5,265	[1]	$ 5,164	[1]

[1] The fair values presented are based on quoted market prices, where available. If quoted market prices are not available, fair values are based on quoted market prices of comparable instruments and/or discounted cash flow analysis.

[2] Fair value is estimated by discounting the future cash flows using the current rates at which similar loans would be made to borrowers with similar credit ratings and for the same remaining maturities or cash flows.

[3] Fair value was determined by discounting anticipated future cash payments using rates currently available for instruments with similar remaining maturities.

[4] Fair value was determined based upon market prices of securities with similar terms and maturities.