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Mortgage Servicing Rights (Tables)
 9 Months Ended
Sep. 30, 2016
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 
 September 30,
 
Nine Months Ended 
 September 30,
(Dollars in thousands)
 
2016
 
2015
 
2016
 
2015
Mortgage servicing rights:
 
 

 
 

 
 

 
 

Balance at beginning of period
 
$
4,339

 
$
4,661

 
$
4,608

 
$
4,733

Additions
 
313

 
342

 
760

 
1,048

Amortization
 
(417
)
 
(339
)
 
(1,133
)
 
(1,117
)
Sales
 
—

 
—

 
—

 
—

Carrying value before valuation allowance at end of period
 
4,235

 
4,664

 
4,235

 
4,664

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
 
$
4,235

 
$
4,664

 
$
4,235

 
$
4,664

Fair value of mortgage servicing rights at end of period
 
$
5,666

 
$
6,945

 
$
5,666

 
$
6,945