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Mortgage Servicing Rights (Tables)
9 Months Ended
Sep. 30, 2011
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
 
2011
 
2010
 
2011
 
2010
 
(in thousands)
Amortized cost:
 
 
 
 
 
 
 
Balance at beginning of period
$
32,809

 
$
25,327

 
$
30,700

 
$
23,498

Originations of mortgage servicing rights
2,213

 
3,197

 
6,881

 
6,870

Amortization expense
(1,343
)
 
(998
)
 
(3,902
)
 
(2,842
)
Balance at end of period
$
33,679

 
$
27,526

 
$
33,679

 
$
27,526

Valuation allowance:
 
 
 
 
 
 
 
Balance at beginning of period
$
(1,550
)
 
$
(1,000
)
 
$
(1,550
)
 
$
(1,000
)
Additions

 
(550
)
 

 
(550
)
Balance at end of period
$
(1,550
)
 
$
(1,550
)
 
$
(1,550
)
 
$
(1,550
)
 
 
 
 
 
 
 
 
Net MSRs at end of period
$
32,129

 
$
25,976

 
$
32,129

 
$
25,976