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Intangible Assets (Details 4) (Mortgage service rights [Member])
9 Months Ended
Sep. 30, 2012
Rate
Mortgage service rights [Member]
 
Assumptions used in estimating the fair value of mortgage service rights  
Weighted-Average Constant Prepayment Rate 16.32%
Weighted-Average Contractual Life (in years) 20 years
Weighted-Average Note Rate 4.38%
Weighted-Average Discount Rate 8.01%