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Accumulated Other Comprehensive Income (Loss) (Tables)
 12 Months Ended
Dec. 31, 2012
Accumulated Other Comprehensive Income (Loss) [Abstract]  
Schedule of Gross Accumulated Other Comprehensive Income (Loss) and Related Income Tax Effects
The following is a summary of the gross amounts of accumulated other comprehensive income (loss) and the related income tax effects:

(Dollars in thousands)
 
Gross
 
Tax
 
Net
December 31, 2012:
 
 
 
 
 
 
Net unrealized gain on securities available for sale
 
$
9,451

 
$
3,525

 
$
5,926

Net unrealized loss on other-than-temporarily impaired securities available for sale
 
(2,162
)
 
(806
)
 
(1,356
)
Net unamortized pension costs
 
(2,364
)
 
(882
)
 
(1,482
)
Net unrealized loss on cash flow hedge
 
(2,484
)
 
(927
)
 
(1,557
)
 
 
$
2,441

 
$
910

 
$
1,531

December 31, 2011:
 
 

 
 

 
 

Net unrealized gain on securities available for sale
 
$
7,202

 
$
2,688

 
$
4,514

Net unrealized loss on other-than-temporarily impaired securities available for sale
 
(2,318
)
 
(865
)
 
(1,453
)
Net unamortized pension costs
 
(4,272
)
 
(1,593
)
 
(2,679
)
Net unrealized loss on cash flow hedge
 
(1,834
)
 
(684
)
 
(1,150
)
 
 
$
(1,222
)
 
$
(454
)
 
$
(768
)
December 31, 2010:
 
 

 
 

 
 

Net unrealized gain on securities available for sale
 
$
5,342

 
$
1,993

 
$
3,349

Net unrealized loss on other-than-temporarily impaired securities available for sale
 
(2,834
)
 
(1,057
)
 
(1,777
)
Net unamortized pension costs
 
(2,927
)
 
(1,092
)
 
(1,835
)
Net unrealized gain on cash flow hedge
 
817

 
305

 
512

 
 
$
398

 
$
149

 
$
249