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Intangible Assets (Details 2) (USD $)
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Changes in mortgage servicing rights      
Balance at beginning of year     $ 3,036,000
Changes in fair value:      
Balance at end of year 3,040,000   3,036,000
Mortgage Service Rights
     
Mortgage Servicing Rights      
Mortgage loans serviced for others 319,300,000   322,500,000
Mortgage loan servicing fees reported as other non-interest income 223,000 217,000  
Changes in mortgage servicing rights      
Balance at beginning of year 3,036,000 2,549,000  
Originated mortgage servicing rights 50,000 197,000  
Changes in fair value:      
Due to change in model inputs and assumptions 106,000 153,000  
Other changes in fair value (152,000) (210,000)  
Balance at end of year $ 3,040,000 $ 2,689,000