Quarterly report pursuant to Section 13 or 15(d)

FAIR VALUE MEASUREMENTS (Summary of estimated fair values of significant financial instruments) (Details)

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FAIR VALUE MEASUREMENTS (Summary of estimated fair values of significant financial instruments) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
ASSETS:    
Short-Term Investments $ 461,714 $ 443,494
Loans, Net of Allowance for Loan Losses (27,803) (29,167)
Carrying Value [Member]
   
ASSETS:    
Cash 52,677 66,238
Short-Term Investments 461,714 443,494
Investment Securities 307,502 296,985
Loans Held for Sale 11,422 14,189
Loans, Net of Allowance for Loan Losses 1,427,096 1,477,946
LIABILITIES:    
Deposits 2,113,982 2,144,996
Short-Term Borrowings 50,682 47,435
Subordinated Notes Payable 62,887 62,887
Long-Term Borrowings 41,224 46,859
Level 1 Inputs [Member]
   
ASSETS:    
Cash 52,677 66,238
Short-Term Investments 461,714 443,494
Investment Securities 94,905 97,249
Loans Held for Sale      
Loans, Net of Allowance for Loan Losses      
LIABILITIES:    
Deposits      
Short-Term Borrowings      
Subordinated Notes Payable      
Long-Term Borrowings      
Level 2 Inputs [Member]
   
ASSETS:    
Cash      
Short-Term Investments      
Investment Securities 212,597 199,736
Loans Held for Sale 11,422 14,189
Loans, Net of Allowance for Loan Losses      
LIABILITIES:    
Deposits 2,114,482 2,145,547
Short-Term Borrowings 50,504 46,503
Subordinated Notes Payable 62,889 62,896
Long-Term Borrowings 43,962 50,003
Level 3 Inputs [Member]
   
ASSETS:    
Cash      
Short-Term Investments      
Investment Securities      
Loans Held for Sale      
Loans, Net of Allowance for Loan Losses 1,322,918 1,370,056
LIABILITIES:    
Deposits      
Short-Term Borrowings      
Subordinated Notes Payable      
Long-Term Borrowings