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Mortgage Servicing Rights (Tables)
 12 Months Ended
Dec. 31, 2017
Transfers and Servicing [Abstract]  
Reconciliation of Mortgage Servicing Assets
Mortgage servicing rights are included in other assets and detailed in the following table:

As of December 31,
2017
 
2016
Mortgage servicing rights
$
5,428,000

 
$
5,901,000

Accumulated amortization
(4,160,000
)
 
(4,680,000
)
Impairment reserve
—

 
(108,000
)
 
$
1,268,000

 
$
1,113,000