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Mortgage Servicing Rights - Estimated Amortization Expense of Mortgage Servicing Rights (Detail) (Mortgage servicing rights [Member], USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Mortgage servicing rights [Member]
 
Finite-Lived Intangible Assets [Line Items]  
Remainder of 2013 $ 218
2014 801
2015 700
2016 602
2017 510
Thereafter $ 2,653