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Other Comprehensive Income (Tables)
 6 Months Ended
Jun. 30, 2013
Equity [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss)
The following table summarizes activity in the unrealized gain or loss on available for sale securities included in other comprehensive income for the six-months and quarters ended June 30, 2013 and 2012.
 
For the six months ended June 30,
 
For the quarters ended June 30,
 
2013
 
2012
 
2013
 
2012
Balance at beginning of period
$
7,940,000

 
$
7,401,000

 
$
5,474,000

 
$
7,088,000

Unrealized gains (losses) arising during the period
(16,410,000
)
 
2,159,000

 
(12,915,000
)
 
2,118,000

Reclassification of realized gains during the period
(1,087,000
)
 
(1,967,000
)
 
(788,000
)
 
(1,444,000
)
Related deferred taxes
6,124,000

 
(67,000
)
 
4,796,000

 
(236,000
)
Net change
(11,373,000
)
 
125,000

 
(8,907,000
)
 
438,000

Balance at end of period
$
(3,433,000
)
 
$
7,526,000

 
$
(3,433,000
)
 
$
7,526,000

The following table summarizes activity in the unrealized gain or loss on postretirement benefits included in other comprehensive income for the six-months and quarters ended June 30, 2013 and 2012.
 
For the six months ended
June 30,
 
For the quarters ended
June 30,
 
2013
 
2012
 
2013
 
2012
Unrecognized postretirement benefits at beginning of period
$
(123,000
)
 
$
(87,000
)
 
$
(119,000
)
 
$
(82,000
)
Amortization of unrecognized transition obligation
5,000

 
14,000

 
—

 
7,000

Change in accumulated losses
4,000

 
—

 
6,000

 
—

Related deferred taxes
(1,000
)
 
(4,000
)
 
(2,000
)
 
(2,000
)
Unrecognized postretirement benefits at end of period
$
(115,000
)
 
$
(77,000
)
 
$
(115,000
)
 
$
(77,000
)