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Loan Servicing (Tables)
 12 Months Ended
Dec. 31, 2018
Text Block [Abstract]  
Originated Mortgage Servicing Rights
 
 
December 31

2018
 
 
December 31

2017
 
 
December 31

2016
 
Mortgage servicing rights
 
 
 
 
 
 
 
 
 
 
 
 
Balances, January 1
 
$
12,189
 
 
$
11,681
 
 
$
9,271
 
Servicing rights capitalized
 
 
1,883
 
 
 
2,109
 
 
 
3,426
 
Amortization of servicing rights
 
 
(1,196
)
 
 
(1,601
)
 
 
(1,016
)
Balances, December 31
 
 
12,876
 
 
 
12,189
 
 
 
11,681
 
Impairment allowance
 
 
 
 
 
 
 
 
 
 
 
 
Balances, January 1
 
 
(587
)
 
 
(507
)
 
 
(397
)
Additions
 
 
(78
)
 
 
(85
)
 
 
(236
)
Reductions
 
 
138
 
 
 
5
 
 
 
126
 
Balances, December 31
 
 
(527
)
 
 
(587
)
 
 
(507
)
Mortgage servicing rights, net
 
$
12,349
 
 
$
11,602
 
 
$
11,174