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Mortgage Servicing Rights (Tables)
 9 Months Ended
Sep. 30, 2015
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
 
2015
 
2014
 
2015
 
2014
 
(in thousands)
Amortized cost:
 
 
 
 
 
 
 
Balance at beginning of period
$
41,598

 
$
42,586

 
$
42,148

 
$
42,452

Originations of mortgage servicing rights
1,463

 
1,456

 
4,976

 
3,807

Amortization
(1,829
)
 
(1,664
)
 
(5,892
)
 
(3,881
)
Balance at end of period
$
41,232

 
$
42,378

 
$
41,232

 
$
42,378