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Mortgage Servicing Rights (Tables)
 6 Months Ended
Jun. 30, 2018
Transfers and Servicing of Financial Assets [Abstract]  
Schedule of changes in carrying value of mortgage servicing rights and associated valuation allowance
The following table shows changes in the carrying value of MSRs and the associated valuation allowance.
 
 
Three Months Ended 
 June 30,
 
Six Months Ended 
 June 30,
(Dollars in thousands)
 
2018
 
2017
 
2018
 
2017
Mortgage servicing rights:
 
 

 
 

 
 

 
 

Balance at beginning of period
 
$
4,356

 
$
4,281

 
$
4,349

 
$
4,297

Additions
 
202

 
246

 
445

 
493

Amortization
 
(235
)
 
(288
)
 
(471
)
 
(551
)
Sales
 
—

 
—

 
—

 
—

Carrying value before valuation allowance at end of period
 
4,323

 
4,239

 
4,323

 
4,239

Valuation allowance:
 
 

 
 

 
 

 
 

Balance at beginning of period
 
—

 
—

 
—

 
—

Impairment recoveries
 
—

 
—

 
—

 
—

Balance at end of period
 
$
—

 
$
—

 
$
—

 
$
—

Net carrying value of mortgage servicing rights at end of period
 
$
4,323

 
$
4,239

 
$
4,323

 
$
4,239

Fair value of mortgage servicing rights at end of period
 
$
7,536

 
$
7,134

 
$
7,536

 
$
7,134