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Intangible Assets (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Changes in mortgage servicing rights        
Balance at beginning of period     $ 2,713  
Changes in fair value:        
Balance at end of period $ 2,871   2,871  
Mortgage servicing rights (MSRs)        
Changes in mortgage servicing rights        
Balance at beginning of period 2,813 $ 2,766 2,713 $ 2,584
Originated mortgage servicing rights 66 61 198 176
Changes in fair value:        
Due to change in model inputs and assumptions [1] 70 (30) 203 289
Other changes in fair value [2] (78) (109) (243) (361)
Balance at end of period $ 2,871 $ 2,688 $ 2,871 $ 2,688
[1] The change in fair value resulting from changes in valuation inputs or assumptions, reported in real estate servicing fees, net, 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, reported in real estate servicing fees, net, reflect changes due to customer payments and passage of time.