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Intangible Assets (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Changes in mortgage servicing rights        
Balance at beginning of period     $ 2,847  
Changes in fair value:        
Balance at end of period $ 2,370   2,370  
Mortgage servicing rights (MSRs)        
Changes in mortgage servicing rights        
Balance at beginning of period 2,511 $ 2,727 2,847 $ 2,762
Originated mortgage servicing rights 96 76 213 303
Changes in fair value:        
Due to change in model inputs and assumptions [1] (52) 136 (197) 223
Other changes in fair value [2] (185) (165) (493) (514)
Balance at end of period $ 2,370 $ 2,774 $ 2,370 $ 2,774
[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.