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Intangible Assets (Details 3) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Changes in fair value:      
Balance at end of year $ 3,036,000 $ 2,549,000  
Balance had error been corrected in prior period
      
Changes in fair value:      
Balance at end of year     1,800,000
Error adjustment related to amortization method of MSR's
      
Changes in fair value:      
Amortization   (538,000)  
Mortgage Service Rights
      
Mortgage Servicing Rights      
Mortgage loans serviced for others 322,500,000 310,600,000  
Mortgage loan servicing fees reported as other non-interest income 901,000 878,000 863,000
Changes in mortgage servicing rights      
Balance at beginning of year 2,549,000 2,308,000 2,356,000
Re-measurement to fair value upon election to measure servicing rights at fair value   742,000  
Originated mortgage servicing rights 512,000 830,000 760,000
Changes in fair value:      
Due to change in model inputs and assumptions 723,000 241,000  
Other changes in fair value (748,000) (1,572,000)  
Amortization     (808,000)
Balance at end of year 3,036,000 2,549,000 2,308,000
Mortgage Service Rights | Fair value option for mortgage servicing rights
      
Mortgage Servicing Rights      
Cumulative effect of change in accounting principle as increase to retained earnings $ 459,890