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Loans and Asset Quality Information (Details 3) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended 12 Months Ended
Jun. 30, 2012
Dec. 31, 2011
Additions due to acquisition of The Bank of Asheville (at fair value)   $ 17,645
Transfers to foreclosed real estate (4,149) (10,573)
Loan charge-offs    (3,329)
Covered
    
Carrying amount of nonimpaired covered loans, beginning balance 353,370 366,521
Additions due to acquisition of The Bank of Asheville (at fair value)   84,623
Principal repayments (25,012) (40,576)
Transfers to foreclosed real estate (11,974) (53,999)
Loan charge-offs (4,176) (14,797)
Accretion of loan discount 5,868 11,598
Balance, ending, carrying value $ 318,076 $ 353,370