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Mortgage Servicing Rights (Tables)
 9 Months Ended
Sep. 30, 2017
Transfers and Servicing [Abstract]  
Summary of Changes in Mortgage Servicing Rights
The following table summarizes the changes in mortgage servicing rights ("MSRs"), which are included in other assets on the consolidated balance sheets:
 
Three months ended September 30
 
Nine months ended September 30
 
2017
 
2016
 
2017
 
2016
 
(in thousands)
Amortized cost:
 
 
 
 
 
 
 
Balance at beginning of period
$
38,180

 
$
39,874

 
$
38,822

 
$
40,944

Originations of mortgage servicing rights
1,333

 
1,499

 
3,719

 
3,927

Amortization
(1,639
)
 
(2,064
)
 
(4,667
)
 
(5,562
)
Balance at end of period
$
37,874

 
$
39,309

 
$
37,874

 
$
39,309

 
 
 
 
 
 
 
 
Valuation allowance:
 
 
 
 
 
 
 
Balance at beginning of period
$
—

 
$
(1,721
)
 
$
(1,291
)
 
$
—

(Additions) reductions to valuation allowance
—

 
(1,280
)
 
1,291

 
(3,001
)
Balance at end of period
$
—

 
$
(3,001
)
 
$
—

 
$
(3,001
)
 
 
 
 
 
 
 
 
Net MSRs at end of period
$
37,874

 
$
36,308

 
$
37,874

 
$
36,308