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Mortgage Servicing Rights (Tables)
 9 Months Ended
Sep. 30, 2012
Transfers and Servicing [Abstract]  
Summary of Changes in Mortgage Servicing Rights
The following table summarizes the changes in mortgage servicing rights (MSRs) for the three and nine months ended September 30, which are included in other assets on the consolidated balance sheets:
 
Three months ended
September 30
 
Nine months ended
September 30
 
2012
 
2011
 
2012
 
2011
 
(in thousands)
Amortized cost:
 
 
 
 
 
 
 
Balance at beginning of period
$
37,003

 
$
32,809

 
$
34,666

 
$
30,700

Originations of mortgage servicing rights
4,341

 
2,213

 
11,177

 
6,881

Amortization
(2,711
)
 
(1,343
)
 
(7,210
)
 
(3,902
)
Balance at end of period
$
38,633

 
$
33,679

 
$
38,633

 
$
33,679

 
 
 
 
 
 
 
 
Valuation allowance:
 
 
 
 
 
 
 
Balance at beginning of period
$
(1,550
)
 
$
(1,550
)
 
$
(1,550
)
 
$
(1,550
)
Additions
(2,130
)
 
—

 
(2,130
)
 
—

Balance at end of period
$
(3,680
)
 
$
(1,550
)
 
$
(3,680
)
 
$
(1,550
)
 
 
 
 
 
 
 
 
Net MSRs at end of period
$
34,953

 
32,129

 
$
34,953

 
$
32,129