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Mortgage Servicing Rights (Tables)
 9 Months Ended
Sep. 30, 2019
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
 
2019
 
2018
 
2019
 
2018
 
(in thousands)
Amortized cost:
 
 
 
 
 
 
 
Balance at beginning of period
$
38,826

 
$
37,894

 
$
38,573

 
$
37,663

Originations of mortgage servicing rights
2,499

 
2,018

 
5,585

 
5,247

Amortization
(1,970
)
 
(1,684
)
 
(4,803
)
 
(4,682
)
Balance at end of period
$
39,355

 
$
38,228

 
$
39,355

 
$
38,228