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Mortgage Servicing Rights (Tables)
 12 Months Ended
Dec. 31, 2014
Transfers and Servicing [Abstract]  
Schedule of Servicing Assets at Amortized Value
Information with respect to the Company’s mortgage servicing rights follows:
Year Ended December 31,
2014
 
2013
 
2012
Balance at beginning of year
$
14,018

 
$
13,224

 
$
13,450

Sales of mortgage servicing rights
—

 
—

 
(735
)
Originations of mortgage servicing rights
2,717

 
3,581

 
4,563

Amortization expense
(2,361
)
 
(2,787
)
 
(3,501
)
Write-off of permanent impairment
—

 
—

 
(553
)
Balance at end of year
14,374

 
14,018

 
13,224

Less valuation reserve
(336
)
 
(472
)
 
(571
)
Balance at end of year
$
14,038

 
$
13,546

 
$
12,653

 
 
 
 
 
 
Principal balance of serviced loans underlying mortgage servicing rights
$
2,615,311

 
$
2,416,621

 
$
2,146,351

Mortgage servicing rights as a percentage of serviced loans
0.54
%
 
0.56
%
 
0.59
%