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Intangible Assets (Details 3) (USD $)
 9 Months Ended 12 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Sep. 30, 2012
Balance had error been corrected in prior period
Dec. 31, 2012
Error adjustment related to amortization method of MSR's
Sep. 30, 2013
Mortgage Service Rights
Sep. 30, 2012
Mortgage Service Rights
Sep. 30, 2013
Mortgage Service Rights
Sep. 30, 2012
Mortgage Service Rights
Dec. 31, 2012
Mortgage Service Rights
Sep. 30, 2013
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
Mortgage loans serviced for others         323,000,000   323,000,000   310,600,000  
Mortgage loan servicing fees reported as other non-interest income         214,000 211,000 674,000 637,000    
Changes in mortgage servicing rights                    
Balance at beginning of year 3,079,000 2,549,000     2,873,000 2,666,000 2,549,000 2,308,000    
Re-measurement to fair value upon election to measure servicing rights at fair value               742,000    
Originated mortgage servicing rights         83,000 231,000 444,000 559,000    
Changes in fair value:                    
Due to change in model inputs and assumptions         296,000 96,000 677,000 372,000    
Other changes in fair value         (173,000) (369,000) (591,000) (1,357,000)    
Balance at end of year 3,079,000 2,549,000     3,079,000 2,624,000 3,079,000 2,624,000    
Error correction, amortization of MSR's     $ 1,800,000 $ 538,000