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Mortgage Servicing Rights (Tables)
3 Months Ended
Mar. 31, 2013
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
 
2013
 
2012
 
(in thousands)
Amortized cost:
 
 
 
Balance at beginning of period
$
39,737

 
$
34,666

Originations of mortgage servicing rights
4,227

 
2,778

Amortization
(2,958
)
 
(2,185
)
Balance at end of period
$
41,006

 
$
35,259

 
 
 
 
Valuation allowance
$
(3,680
)
 
$
(1,550
)
 
 
 
 
Net MSRs at end of period
$
37,326

 
33,709