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Intangible Assets (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Changes in mortgage servicing rights        
Balance at beginning of period     $ 2,584  
Changes in fair value:        
Balance at end of period $ 2,688   2,688  
Mortgage servicing rights (MSRs)        
Changes in mortgage servicing rights        
Balance at beginning of period 2,766 $ 2,511 2,584 $ 2,847
Originated mortgage servicing rights 61 96 176 213
Changes in fair value:        
Due to change in model inputs and assumptions [1] (30) (52) 289 (197)
Other changes in fair value [2] (109) (185) (361) (493)
Balance at end of period $ 2,688 $ 2,370 $ 2,688 $ 2,370
[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.