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Mortgage Servicing Rights (Tables)
 3 Months Ended
Mar. 31, 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 
 March 31,
(Dollars in thousands)
 
2018
 
2017
Mortgage servicing rights:
 
 

 
 

Balance at beginning of period
 
$
4,349

 
$
4,297

Additions
 
243

 
247

Amortization
 
(236
)
 
(263
)
Sales
 
—

 
—

Carrying value before valuation allowance at end of period
 
4,356

 
4,281

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
 
$
4,356

 
$
4,281

Fair value of mortgage servicing rights at end of period
 
$
7,389

 
$
7,452