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FAIR VALUE MEASUREMENT (Summary of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Financial Assets:    
Securities available-for-sale $ 797,242 $ 808,477
Trading account assets 2,308 2,488
US Government-sponsored Enterprises Debt Securities [Member]
   
Financial Assets:    
Securities available-for-sale 4,962  
Obligations of states and political subdivisions
   
Financial Assets:    
Securities available-for-sale 29,674 31,207
Mortgage-backed securities issued or guaranteed by U.S. government sponsored enterprises
   
Financial Assets:    
Securities available-for-sale 394,763 395,903
Collateralized mortgage obligations issued or guaranteed by U.S. government sponsored enterprises
   
Financial Assets:    
Securities available-for-sale 361,339 374,435
Private issue collateralized mortgage obligations
   
Financial Assets:    
Securities available-for-sale 6,504 6,932
Readily Available Market Prices (Level 1)
   
Financial Assets:    
Trading account assets 2,308 2,488
Readily Available Market Prices (Level 1) | Fair Value, Measurements, Recurring
   
Financial Assets:    
Trading account assets   2,488
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value      
Financial Liabilities:    
Interest rate swap agreements      
Customer interest rate swap agreements 0 0
Readily Available Market Prices (Level 1) | Fair Value, Measurements, Recurring | US Government-sponsored Enterprises Debt Securities [Member]
   
Financial Assets:    
Securities available-for-sale     
Readily Available Market Prices (Level 1) | Fair Value, Measurements, Recurring | Obligations of states and political subdivisions
   
Financial Assets:    
Securities available-for-sale      
Readily Available Market Prices (Level 1) | Fair Value, Measurements, Recurring | Mortgage-backed securities issued or guaranteed by U.S. government sponsored enterprises
   
Financial Assets:    
Securities available-for-sale      
Readily Available Market Prices (Level 1) | Fair Value, Measurements, Recurring | Collateralized mortgage obligations issued or guaranteed by U.S. government sponsored enterprises
   
Financial Assets:    
Securities available-for-sale      
Readily Available Market Prices (Level 1) | Fair Value, Measurements, Recurring | Private issue collateralized mortgage obligations
   
Financial Assets:    
Securities available-for-sale      
Observable Market Data (Level 2)
   
Financial Assets:    
Securities available-for-sale 797,242 808,477
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value 142 114
Financial Liabilities:    
Interest rate swap agreements 5,577 3,911
Customer interest rate swap agreements 142 114
Observable Market Data (Level 2) | Fair Value, Measurements, Recurring
   
Financial Assets:    
Trading account assets      
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value 142 114
Financial Liabilities:    
Interest rate swap agreements 5,577 3,911
Customer interest rate swap agreements 142 114
Observable Market Data (Level 2) | Fair Value, Measurements, Recurring | US Government-sponsored Enterprises Debt Securities [Member]
   
Financial Assets:    
Securities available-for-sale 4,962  
Observable Market Data (Level 2) | Fair Value, Measurements, Recurring | Obligations of states and political subdivisions
   
Financial Assets:    
Securities available-for-sale 29,674 31,207
Observable Market Data (Level 2) | Fair Value, Measurements, Recurring | Mortgage-backed securities issued or guaranteed by U.S. government sponsored enterprises
   
Financial Assets:    
Securities available-for-sale 394,763 395,903
Observable Market Data (Level 2) | Fair Value, Measurements, Recurring | Collateralized mortgage obligations issued or guaranteed by U.S. government sponsored enterprises
   
Financial Assets:    
Securities available-for-sale 361,339 374,435
Observable Market Data (Level 2) | Fair Value, Measurements, Recurring | Private issue collateralized mortgage obligations
   
Financial Assets:    
Securities available-for-sale 6,504 6,932
Company Determined Fair Value (Level 3) | Fair Value, Measurements, Recurring
   
Financial Assets:    
Trading account assets      
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value      
Financial Liabilities:    
Interest rate swap agreements      
Customer interest rate swap agreements 0 0
Company Determined Fair Value (Level 3) | Fair Value, Measurements, Recurring | US Government-sponsored Enterprises Debt Securities [Member]
   
Financial Assets:    
Securities available-for-sale     
Company Determined Fair Value (Level 3) | Fair Value, Measurements, Recurring | Obligations of states and political subdivisions
   
Financial Assets:    
Securities available-for-sale      
Company Determined Fair Value (Level 3) | Fair Value, Measurements, Recurring | Mortgage-backed securities issued or guaranteed by U.S. government sponsored enterprises
   
Financial Assets:    
Securities available-for-sale      
Company Determined Fair Value (Level 3) | Fair Value, Measurements, Recurring | Collateralized mortgage obligations issued or guaranteed by U.S. government sponsored enterprises
   
Financial Assets:    
Securities available-for-sale      
Company Determined Fair Value (Level 3) | Fair Value, Measurements, Recurring | Private issue collateralized mortgage obligations
   
Financial Assets:    
Securities available-for-sale      
Portion at Fair Value Measurement [Member]
   
Financial Assets:    
Securities available-for-sale 797,242 808,477
Trading account assets 2,308 2,488
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value 142 114
Financial Liabilities:    
Interest rate swap agreements 5,577 3,911
Customer interest rate swap agreements 142 114
Portion at Fair Value Measurement [Member] | Fair Value, Measurements, Recurring
   
Financial Assets:    
Trading account assets 2,308 2,488
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value 142 114
Financial Liabilities:    
Interest rate swap agreements 5,577 3,911
Customer interest rate swap agreements 142 114
Portion at Fair Value Measurement [Member] | Fair Value, Measurements, Recurring | US Government-sponsored Enterprises Debt Securities [Member]
   
Financial Assets:    
Securities available-for-sale 4,962  
Portion at Fair Value Measurement [Member] | Fair Value, Measurements, Recurring | Obligations of states and political subdivisions
   
Financial Assets:    
Securities available-for-sale 29,674 31,207
Portion at Fair Value Measurement [Member] | Fair Value, Measurements, Recurring | Mortgage-backed securities issued or guaranteed by U.S. government sponsored enterprises
   
Financial Assets:    
Securities available-for-sale 394,763 395,903
Portion at Fair Value Measurement [Member] | Fair Value, Measurements, Recurring | Collateralized mortgage obligations issued or guaranteed by U.S. government sponsored enterprises
   
Financial Assets:    
Securities available-for-sale 361,339 374,435
Portion at Fair Value Measurement [Member] | Fair Value, Measurements, Recurring | Private issue collateralized mortgage obligations
   
Financial Assets:    
Securities available-for-sale $ 6,504 $ 6,932