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Other Comprehensive Income
 3 Months Ended
Mar. 31, 2013
Equity [Abstract]  
Other Comprehensive Income
Other Comprehensive Income

The gross amounts of each component of other comprehensive income and the related tax effects are as follows:
 
Pre-tax
 
Tax Expense (Benefit)
 
Net of Tax
Three Months Ended March 31,
2013
 
2012
 
2013
 
2012
 
2013
 
2012
Investment securities available-for sale:
 
 
 
 
 
 
 
 
 
 
 
Change in net unrealized gain during period
$
(5,717
)
 
$
755

 
$
(2,250
)
 
$
296

 
$
(3,467
)
 
$
459

Reclassification adjustment for net gains included in net income
(8
)
 
(31
)
 
(3
)
 
(12
)
 
(5
)
 
(19
)
Defined benefits post-retirement benefit plan:
 
 
 
 
 
 
 
 
 
 
 
Change in net actuarial loss
35

 
33

 
14

 
13

 
21

 
20

Total other comprehensive income
$
(5,690
)
 
$
757

 
$
(2,239
)
 
$
297

 
$
(3,451
)
 
$
460


    
The components of accumulated other comprehensive income, net of income taxes, are as follows:    
 
March 31,
2013
 
December 31,
2012
Net unrealized gain on investment securities available-for-sale
$
14,065

 
$
17,537

Net actuarial loss on defined benefit post-retirement benefit plans
(1,525
)
 
(1,546
)
Net accumulated other comprehensive income
$
12,540

 
$
15,991