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Mortgage Servicing Rights - Estimated Amortization Expense (Details 2) (Mortgage servicing rights [Member], USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Mortgage servicing rights [Member]
 
Amortization expense of mortgage servicing rights  
Remainder of 2013 $ 687
2014 793
2015 647
2016 525
2017 415
Thereafter $ 1,656