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Fair Value Measurements (Details 3) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
ASSETS    
SECURITIES HELD TO MATURITY $ 186,842 $ 204,956
Held to Maturity, Fair Value, Total 195,454 211,494
LOANS, NET OF ALLOWANCE FOR LOAN LOSSES 4,006,389 3,746,130
TIME CERTIFICATES OF DEPOSITS [Member]
   
LIABILITIES    
Financial Liabilities, Book Value 630,419 [1] 630,162 [1]
Accrued Liabilities, Fair Value Disclosure 636,197 [1] 639,333 [1]
FEDERAL HOME LOAN BANK ADVANCES [Member]
   
LIABILITIES    
Financial Liabilities, Book Value 189,464 [1] 229,701 [1]
Accrued Liabilities, Fair Value Disclosure 189,785 [1] 233,880 [1]
WHOLESALE AND CUSTOMER REPURCHASE AGREEMENTS [Member]
   
LIABILITIES    
Financial Liabilities, Book Value 208,578 [1] 216,128 [1]
Accrued Liabilities, Fair Value Disclosure 206,199 [1] 219,857 [1]
JUNIOR SUBORDINATED DEBENTURES [Member]
   
LIABILITIES    
Financial Liabilities, Book Value 61,857 [2] 61,857 [2]
Accrued Liabilities, Fair Value Disclosure 61,238 [2] 60,620 [2]
SUBORDINATED DEBENTURES [Member]
   
LIABILITIES    
Financial Liabilities, Book Value 30,000 [1] 30,000 [1]
Accrued Liabilities, Fair Value Disclosure 23,375 [1] 27,217 [1]
U.S. Treasury Securities [Member]
   
ASSETS    
SECURITIES HELD TO MATURITY 1,013 [3] 1,014 [3]
Held to Maturity, Fair Value, Total 1,143 [3] 1,117 [3]
Agency Mortgage-Backed Securities [Member]
   
ASSETS    
SECURITIES HELD TO MATURITY 81,523 [3] 109,553 [3]
Held to Maturity, Fair Value, Total 86,762 [3] 113,959 [3]
Agency Collateralized Mortgage Obligations [Member]
   
ASSETS    
SECURITIES HELD TO MATURITY 91,845 [3] 77,804 [3]
Held to Maturity, Fair Value, Total 94,769 [3] 80,298 [3]
State County and Municipal Securities [Member]
   
ASSETS    
SECURITIES HELD TO MATURITY 915 [3] 3,576 [3]
Held to Maturity, Fair Value, Total 929 [3] 3,610 [3]
Single Issuer Trust Preferred Securities Issued by Banks [Member]
   
ASSETS    
SECURITIES HELD TO MATURITY 6,538 [3] 8,000 [3]
Held to Maturity, Fair Value, Total 6,601 [3] 7,346 [3]
Corporate Debt Securities [Member]
   
ASSETS    
SECURITIES HELD TO MATURITY 5,008 [3] 5,009 [3]
Held to Maturity, Fair Value, Total 5,250 [3] 5,164 [3]
Loans Net Of Allowance For Loan Loses [Member]
   
ASSETS    
LOANS, NET OF ALLOWANCE FOR LOAN LOSSES 4,006,389 [4] 3,746,130 [4]
Loans Receivable, Fair Value Disclosure 4,009,976 [4] 3,807,938 [4]
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | TIME CERTIFICATES OF DEPOSITS [Member]
   
LIABILITIES    
Accrued Liabilities, Fair Value Disclosure    [1]    [1]
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | FEDERAL HOME LOAN BANK ADVANCES [Member]
   
LIABILITIES    
Accrued Liabilities, Fair Value Disclosure    [1]    [1]
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | WHOLESALE AND CUSTOMER REPURCHASE AGREEMENTS [Member]
   
LIABILITIES    
Accrued Liabilities, Fair Value Disclosure    [1]    [1]
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | JUNIOR SUBORDINATED DEBENTURES [Member]
   
LIABILITIES    
Accrued Liabilities, Fair Value Disclosure    [2]    [2]
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | SUBORDINATED DEBENTURES [Member]
   
LIABILITIES    
Accrued Liabilities, Fair Value Disclosure    [1]    [1]
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | U.S. Treasury Securities [Member]
   
ASSETS    
Held to Maturity, Fair Value, Total    [3]    [3]
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Agency Mortgage-Backed Securities [Member]
   
ASSETS    
Held to Maturity, Fair Value, Total    [3]    [3]
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Agency Collateralized Mortgage Obligations [Member]
   
ASSETS    
Held to Maturity, Fair Value, Total    [3]    [3]
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | State County and Municipal Securities [Member]
   
ASSETS    
Held to Maturity, Fair Value, Total    [3]    [3]
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Single Issuer Trust Preferred Securities Issued by Banks [Member]
   
ASSETS    
Held to Maturity, Fair Value, Total    [3]    [3]
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Corporate Debt Securities [Member]
   
ASSETS    
Held to Maturity, Fair Value, Total    [3]    [3]
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Loans Net Of Allowance For Loan Loses [Member]
   
ASSETS    
Loans Receivable, Fair Value Disclosure    [4]    [4]
Significant Other Observable Inputs (Level 2) [Member] | TIME CERTIFICATES OF DEPOSITS [Member]
   
LIABILITIES    
Accrued Liabilities, Fair Value Disclosure 636,197 [1] 639,333 [1]
Significant Other Observable Inputs (Level 2) [Member] | FEDERAL HOME LOAN BANK ADVANCES [Member]
   
LIABILITIES    
Accrued Liabilities, Fair Value Disclosure 189,785 [1] 233,880 [1]
Significant Other Observable Inputs (Level 2) [Member] | WHOLESALE AND CUSTOMER REPURCHASE AGREEMENTS [Member]
   
LIABILITIES    
Accrued Liabilities, Fair Value Disclosure    [1]    [1]
Significant Other Observable Inputs (Level 2) [Member] | JUNIOR SUBORDINATED DEBENTURES [Member]
   
LIABILITIES    
Accrued Liabilities, Fair Value Disclosure 61,238 [2] 60,620 [2]
Significant Other Observable Inputs (Level 2) [Member] | SUBORDINATED DEBENTURES [Member]
   
LIABILITIES    
Accrued Liabilities, Fair Value Disclosure    [1]    [1]
Significant Other Observable Inputs (Level 2) [Member] | U.S. Treasury Securities [Member]
   
ASSETS    
Held to Maturity, Fair Value, Total 1,143 [3] 1,117 [3]
Significant Other Observable Inputs (Level 2) [Member] | Agency Mortgage-Backed Securities [Member]
   
ASSETS    
Held to Maturity, Fair Value, Total 86,762 [3] 113,959 [3]
Significant Other Observable Inputs (Level 2) [Member] | Agency Collateralized Mortgage Obligations [Member]
   
ASSETS    
Held to Maturity, Fair Value, Total 94,769 [3] 80,298 [3]
Significant Other Observable Inputs (Level 2) [Member] | State County and Municipal Securities [Member]
   
ASSETS    
Held to Maturity, Fair Value, Total 929 [3] 3,610 [3]
Significant Other Observable Inputs (Level 2) [Member] | Single Issuer Trust Preferred Securities Issued by Banks [Member]
   
ASSETS    
Held to Maturity, Fair Value, Total 6,601 [3] 7,346 [3]
Significant Other Observable Inputs (Level 2) [Member] | Corporate Debt Securities [Member]
   
ASSETS    
Held to Maturity, Fair Value, Total 5,250 [3] 5,164 [3]
Significant Other Observable Inputs (Level 2) [Member] | Loans Net Of Allowance For Loan Loses [Member]
   
ASSETS    
Loans Receivable, Fair Value Disclosure    [4]    [4]
Significant Unobservable Inputs (Level 3) [Member] | TIME CERTIFICATES OF DEPOSITS [Member]
   
LIABILITIES    
Accrued Liabilities, Fair Value Disclosure    [1]    [1]
Significant Unobservable Inputs (Level 3) [Member] | FEDERAL HOME LOAN BANK ADVANCES [Member]
   
LIABILITIES    
Accrued Liabilities, Fair Value Disclosure    [1]    [1]
Significant Unobservable Inputs (Level 3) [Member] | WHOLESALE AND CUSTOMER REPURCHASE AGREEMENTS [Member]
   
LIABILITIES    
Accrued Liabilities, Fair Value Disclosure 206,199 [1] 219,857 [1]
Significant Unobservable Inputs (Level 3) [Member] | JUNIOR SUBORDINATED DEBENTURES [Member]
   
LIABILITIES    
Accrued Liabilities, Fair Value Disclosure    [2]    [2]
Significant Unobservable Inputs (Level 3) [Member] | SUBORDINATED DEBENTURES [Member]
   
LIABILITIES    
Accrued Liabilities, Fair Value Disclosure 23,375 [1] 27,217 [1]
Significant Unobservable Inputs (Level 3) [Member] | U.S. Treasury Securities [Member]
   
ASSETS    
Held to Maturity, Fair Value, Total    [3]    [3]
Significant Unobservable Inputs (Level 3) [Member] | Agency Mortgage-Backed Securities [Member]
   
ASSETS    
Held to Maturity, Fair Value, Total    [3]    [3]
Significant Unobservable Inputs (Level 3) [Member] | Agency Collateralized Mortgage Obligations [Member]
   
ASSETS    
Held to Maturity, Fair Value, Total    [3]    [3]
Significant Unobservable Inputs (Level 3) [Member] | State County and Municipal Securities [Member]
   
ASSETS    
Held to Maturity, Fair Value, Total    [3]    [3]
Significant Unobservable Inputs (Level 3) [Member] | Single Issuer Trust Preferred Securities Issued by Banks [Member]
   
ASSETS    
Held to Maturity, Fair Value, Total    [3]    [3]
Significant Unobservable Inputs (Level 3) [Member] | Corporate Debt Securities [Member]
   
ASSETS    
Held to Maturity, Fair Value, Total    [3]    [3]
Significant Unobservable Inputs (Level 3) [Member] | Loans Net Of Allowance For Loan Loses [Member]
   
ASSETS    
Loans Receivable, Fair Value Disclosure $ 4,009,976 [4] $ 3,807,938 [4]
[1] Fair value was determined by discounting anticipated future cash payments using rates currently available for instruments with similar remaining maturities.
[2] Fair value was determined based upon market prices of securities with similar terms and maturities.
[3] 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 analyses.
[4] 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.