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Mortgage Servicing Rights (Tables)
 3 Months Ended
Mar. 31, 2018
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 March 31
 
2018
 
2017
 
(in thousands)
Amortized cost:
 
 
 
Balance at beginning of period
$
37,663

 
$
38,822

Originations of mortgage servicing rights
1,483

 
1,183

Amortization
(1,398
)
 
(1,462
)
Balance at end of period
$
37,748

 
$
38,543

 
 
 
 
Valuation allowance:
 
 
 
Valuation Allowance - Balance at beginning and end of period
$
—

 
$
(1,291
)
 
 
 
 
Net MSRs at end of period
$
37,748

 
$
37,252