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Goodwill (Details) (USD $)
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
Independent Bank [Member]
Dec. 07, 2012
Independent Bank [Member]
Branches
Goodwill [Line Items]        
Goodwill $ 120,164,000 $ 113,414,000   $ 6,800,000
Number of branches acquired (branches)       21
Goodwill expected tax deductible amount     $ 5,900,000