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Mortgage Banking (Tables)
 12 Months Ended
Dec. 31, 2017
Transfers and Servicing [Abstract]  
Schedule of Mortgage Servicing Rights Capitalized and Amortized
The following summarizes servicing assets capitalized and amortized, along with the activity in the related valuation allowance:
 
As of and For The Year Ended
December 31,
 
2017
 
2016
 
2015
Servicing Assets:
  

 
  

 
  

Balance at beginning of year
$
1,210

 
$
2,161

 
$
493

Capitalized servicing right fees upon sale(1)
22

 
9

 
294

Acquired in connection with acquisition of SBM, at fair value
—

 
—

 
1,608

Amortization charged against mortgage servicing fee income(1)
(430
)
 
(734
)
 
(231
)
Valuation adjustment
223

 
(226
)
 
(3
)
Balance at end of year
$
1,025

 
$
1,210

 
$
2,161

Valuation Allowance:
  

 
  

 
  

Balance at beginning of year
$
(230
)
 
$
(4
)
 
$
(1
)
(Increase) decrease in impairment reserve(1)
223

 
(226
)
 
(3
)
Balance at end of year
$
(7
)
 
$
(230
)
 
$
(4
)
Fair value, beginning of year
$
1,701

 
$
2,947

 
$
1,447

Fair value, end of year
$
1,766

 
$
1,701

 
$
2,947


(1)
Reported within mortgage banking income, net on the Company's consolidated statements of income.