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Mortgage Servicing Rights (Tables)
 12 Months Ended
Dec. 31, 2016
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,
2016
 
2015
 
2014
Balance at beginning of year
$
15,860

 
$
14,374

 
$
14,018

Acquisitions of mortgage servicing rights
—

 
306

 
—

Originations of mortgage servicing rights
5,758

 
3,614

 
2,717

Amortization expense
(2,957
)
 
(2,434
)
 
(2,361
)
Balance at end of year
18,661

 
15,860

 
14,374

Less valuation reserve
(204
)
 
(239
)
 
(336
)
Balance at end of year
$
18,457

 
$
15,621

 
$
14,038

 
 
 
 
 
 
Principal balance of serviced loans underlying mortgage servicing rights
$
3,127,528

 
$
2,906,239

 
$
2,615,311

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