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Derivative Financial Instruments (Details) (USD $)
9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2012
Dec. 31, 2011
Sep. 30, 2012
Interest Rate Swap Contracts [Member]
Sep. 30, 2012
Interest Rate Swap Contracts [Member]
Derivatives in Cash Flow Hedging Relationships [Member]
Sep. 30, 2011
Interest Rate Swap Contracts [Member]
Derivatives in Cash Flow Hedging Relationships [Member]
Sep. 30, 2012
Interest Rate Swap Contracts [Member]
Derivatives in Cash Flow Hedging Relationships [Member]
Sep. 30, 2011
Interest Rate Swap Contracts [Member]
Derivatives in Cash Flow Hedging Relationships [Member]
Sep. 30, 2012
Interest Rate Swap Contracts [Member]
Interest expense [Member]
Derivatives in Cash Flow Hedging Relationships [Member]
Sep. 30, 2011
Interest Rate Swap Contracts [Member]
Interest expense [Member]
Derivatives in Cash Flow Hedging Relationships [Member]
Sep. 30, 2012
Interest Rate Swap Contracts [Member]
Interest expense [Member]
Derivatives in Cash Flow Hedging Relationships [Member]
Sep. 30, 2011
Interest Rate Swap Contracts [Member]
Interest expense [Member]
Derivatives in Cash Flow Hedging Relationships [Member]
Derivatives, Fair Value [Line Items]                      
Interest rate swap contract term     5 years                
Notional value of interest rate swap contract     $ 8,900,000                
Fixed rate of interest payable on interest rate swap contract (in hundredths)     4.48%                
Derivative variable rate basis     one-month LIBOR                
Floating rate of interest receivable on interest rate swap contract (in hundredths)     0.23%                
Unrealized net losses     195,000                
Fair value of derivative instrument [Abstract]                      
Fair value of derivative financial instrument 313,000 572,000                  
Effect of interest rate swap contract accounted for derivative instrument on Consolidated Statements of Income [Abstract]                      
Amount of Gain Recognized in Accumulated OCI (Effective Portion)       92,000 62,000 259,000 174,000        
Amount of Loss Reclassified from Accumulated OCI into Income (Effective Portion)               $ 96,000 $ 104,000 $ 289,000 $ 301,000