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Mortgage Servicing Rights (Tables)
12 Months Ended
Dec. 31, 2012
Transfers and Servicing [Abstract]  
Schedule of Servicing Assets at Amortized Value
Information with respect to the Company’s mortgage servicing rights follows:
Year Ended December 31,
2012
 
2011
 
2010
Balance at beginning of year
$
13,450

 
$
13,811

 
$
18,732

Sales of mortgage servicing rights
(735
)
 

 
(4,528
)
Purchases of mortgage servicing rights

 

 

Originations of mortgage servicing rights
4,563

 
2,864

 
4,222

Amortization expense
(3,501
)
 
(3,225
)
 
(4,615
)
Write-off of permanent impairment
(553
)
 

 

Balance at end of year
13,224

 
13,450

 
13,811

Less valuation reserve
(571
)
 
(1,895
)
 
(620
)
Balance at end of year
$
12,653

 
$
11,555

 
$
13,191

 
 
 
 
 
 
Principal balance of serviced loans underlying mortgage servicing rights
$
2,146,351

 
$
1,803,303

 
$
1,594,697

Mortgage servicing rights as a percentage of serviced loans
0.59
%
 
0.64
%
 
0.83
%