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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
Jun. 30, 2013
Mortgage servicing rights [Member]
 
Finite-Lived Intangible Assets [Line Items]  
Remainder of 2013 $ 423
2014 769
2015 654
2016 548
2017 445
Thereafter $ 2,388