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Mortgage Servicing Rights (Tables)
 6 Months Ended
Jun. 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 June 30
 
Six months ended June 30
 
2015
 
2014
 
2015
 
2014
 
(in thousands)
Amortized cost:
 
 
 
 
 
 
 
Balance at beginning of period
$
41,803

 
$
41,668

 
$
42,148

 
$
42,452

Originations of mortgage servicing rights
1,956

 
1,236

 
3,513

 
2,351

Amortization
(2,161
)
 
(318
)
 
(4,063
)
 
(2,217
)
Balance at end of period
$
41,598

 
$
42,586

 
$
41,598

 
$
42,586