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Fair Value Measurements, By Balance Sheet Grouping (Details) (USD $)
In Thousands, unless otherwise specified
6 Months Ended
Jun. 30, 2012
Dec. 31, 2011
Financial Assets [Abstract]    
Cash and due from banks $ 17,768  
Available-for-sale securities 323,131 318,823
Net loans 539,268  
Bank owned life insurance 13,919  
Regulatory stock 4,461  
Accrued interest receivable 3,800  
Financial Liabilities [Abstract]    
Deposits 744,787  
Borrowed funds 44,909  
Trust preferred interest rate swap 283  
Accrued interest payable 1,222  
Consideration period for recognition of cash and due from banks 90 days  
Consideration period for recognition of accrued interest receivable and payable 90 days  
Carrying Amount [Member]
   
Financial Assets [Abstract]    
Cash and due from banks 17,768 30,432
Available-for-sale securities 323,131 318,823
Net loans 490,482 481,022
Bank owned life insurance 13,919 13,669
Regulatory stock 4,461 3,301
Accrued interest receivable 3,800 3,621
Financial Liabilities [Abstract]    
Deposits 738,767 733,993
Borrowed funds 47,066 53,882
Trust preferred interest rate swap 283 348
Accrued interest payable 1,222 1,512
Fair Value [Member]
   
Financial Assets [Abstract]    
Cash and due from banks 17,768 30,432
Available-for-sale securities 323,131 318,823
Net loans 539,268 527,724
Bank owned life insurance 13,919 13,669
Regulatory stock 4,461 3,301
Accrued interest receivable 3,800 3,621
Financial Liabilities [Abstract]    
Deposits 744,787 740,839
Borrowed funds 44,909 51,437
Trust preferred interest rate swap 283 348
Accrued interest payable 1,222 1,512
Level I [Member]
   
Financial Assets [Abstract]    
Cash and due from banks 17,768  
Available-for-sale securities 1,380  
Net loans 0  
Bank owned life insurance 13,919  
Regulatory stock 4,461  
Accrued interest receivable 3,800  
Financial Liabilities [Abstract]    
Deposits 446,307  
Borrowed funds 0  
Trust preferred interest rate swap 0  
Accrued interest payable 1,222  
Level II [Member]
   
Financial Assets [Abstract]    
Cash and due from banks 0  
Available-for-sale securities 321,751  
Net loans 0  
Bank owned life insurance 0  
Regulatory stock 0  
Accrued interest receivable 0  
Financial Liabilities [Abstract]    
Deposits 0  
Borrowed funds 44,909  
Trust preferred interest rate swap 283  
Accrued interest payable 0  
Level III [Member]
   
Financial Assets [Abstract]    
Cash and due from banks 0  
Available-for-sale securities 0  
Net loans 539,268  
Bank owned life insurance 0  
Regulatory stock 0  
Accrued interest receivable 0  
Financial Liabilities [Abstract]    
Deposits 298,480  
Borrowed funds 0  
Trust preferred interest rate swap 0  
Accrued interest payable $ 0