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Intangible Assets (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Changes in mortgage servicing rights    
Balance at beginning of period $ 2,713  
Changes in fair value:    
Balance at end of period 2,781  
Mortgage servicing rights (MSRs)    
Changes in mortgage servicing rights    
Balance at beginning of period 2,713 $ 2,584
Originated mortgage servicing rights 50 49
Changes in fair value:    
Due to change in model inputs and assumptions [1] 103 375
Other changes in fair value [2] (85) (131)
Balance at end of period $ 2,781 $ 2,877
[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.