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Changes in Servicing Assets (Detail) (USD $)
In Thousands, unless otherwise specified
9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Balance at Beginning of Period $ 3,720 $ 2,890
Additions 2,148 481
Amortization 720 (487)
Balance at End of Period $ 5,148 $ 2,884