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Intangible Assets (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Changes in mortgage servicing rights        
Balance at beginning of period     $ 2,762  
Changes in fair value:        
Balance at end of period $ 2,774   2,774  
Mortgage Service Rights        
Changes in mortgage servicing rights        
Balance at beginning of period 2,727 $ 2,911 2,762 $ 3,036
Originated mortgage servicing rights 76 95 303 217
Changes in fair value:        
Due to change in model inputs and assumptions [1] 136 27 223 97
Other changes in fair value [2] (165) (166) (514) (483)
Balance at end of period $ 2,774 $ 2,867 $ 2,774 $ 2,867
[1] The change in fair value resulting from changes in valuation inputs or assumptions used in the valuation model reflects the change in discount rates and prepayment speed assumptions primarily due to changes in interest rates.
[2] Other changes in fair value reflect changes due to customer payments and passage of time.