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Fair Value Information (Details 1) (Fair Value, Measurements, Nonrecurring [Member], USD $)
In Thousands, unless otherwise specified
 6 Months Ended 12 Months Ended
Jun. 30, 2012
Dec. 31, 2011
Assets and Liabilities Measured at Fair Value on a Non-Recurring Basis    
Impairment losses    $ (656)
Loss on Impaired Loans Non-covered (1,979) (6,707)
OREO-Non-covered     
Loss on OREO Non-covered (24) (523)
Loss on OREO-Covered (74) (2,192)
Non-covered loans held for sale activity [Member]
    
Assets and Liabilities Measured at Fair Value on a Non-Recurring Basis    
Loss on Loans held-for-sale   (250)
Covered loans held for sale activity [Member]
    
Assets and Liabilities Measured at Fair Value on a Non-Recurring Basis    
Loss on Loans held-for-sale     
Carrying Amount [Member]
    
Assets and Liabilities Measured at Fair Value on a Non-Recurring Basis    
Investment Security-HTM    2,383
Impaired Loans-Non-covered 7,667 30,014
OREO-Non-covered 203 4,866
OREO-Covered 497 2,541
Carrying Amount [Member] | Non-covered loans held for sale activity [Member]
    
Assets and Liabilities Measured at Fair Value on a Non-Recurring Basis    
Loans held-for-sale   1,404
Carrying Amount [Member] | Covered loans held for sale activity [Member]
    
Assets and Liabilities Measured at Fair Value on a Non-Recurring Basis    
Loans held-for-sale     
Quoted Prices in Active Markets for Identical Assets [Member]
    
Assets and Liabilities Measured at Fair Value on a Non-Recurring Basis    
Investment Security-HTM     
Impaired Loans-Non-covered     
OREO-Covered     
Quoted Prices in Active Markets for Identical Assets [Member] | Covered loans held for sale activity [Member]
    
Assets and Liabilities Measured at Fair Value on a Non-Recurring Basis    
Loans held-for-sale     
Significant Other Observable Inputs [Member]
    
Assets and Liabilities Measured at Fair Value on a Non-Recurring Basis    
Investment Security-HTM     
Impaired Loans-Non-covered     
OREO-Non-covered     
OREO-Covered     
Significant Other Observable Inputs [Member] | Covered loans held for sale activity [Member]
    
Assets and Liabilities Measured at Fair Value on a Non-Recurring Basis    
Loans held-for-sale     
Significant Unobservable Inputs [Member]
    
Assets and Liabilities Measured at Fair Value on a Non-Recurring Basis    
Investment Security-HTM    2,383
Impaired Loans-Non-covered 7,667 30,014
OREO-Non-covered 203 4,866
OREO-Covered 497 2,541
Significant Unobservable Inputs [Member] | Non-covered loans held for sale activity [Member]
    
Assets and Liabilities Measured at Fair Value on a Non-Recurring Basis    
Loans held-for-sale   1,404
Significant Unobservable Inputs [Member] | Covered loans held for sale activity [Member]
    
Assets and Liabilities Measured at Fair Value on a Non-Recurring Basis    
Loans held-for-sale