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Mortgage Servicing Rights (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Dec. 31, 2011
Mortgage servicing rights [Roll Forward]        
Mortgage servicing rights, beginning balance $ 3,220 $ 198 $ 198 $ 42
Additions 958 439 3,411 169
Amortization (269) (22) (389) (13)
Mortgage servicing rights, ending balance 3,909 615 3,220 198
Valuation allowance at period end 0 0 0 0
Mortgage servicing rights, end of period net 3,909 615 3,220 198
Estimated future servicing rights amortization expense by period [Abstract]        
2013 862   890  
2014 935   747  
2015 765   603  
2016 597   459  
2017 429   316  
Thereafter 321   205  
Total $ 3,909   $ 3,220