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Comprehensive Income (Tables)
 12 Months Ended
Dec. 31, 2012
Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Schedule of Comprehensive Income (Loss) [Table Text Block]
The following table presents the components of other comprehensive income for the years ended December 31, 2012, 2011 and 2010:
 
 
 
Tax
 
 
 
Before-Tax
 
(Expense)
 
Net-of-Tax
 
Amount
 
Benefit
 
Amount
2012
 
 
 
 
 
Unrealized Securities Holding Gains Arising During the Period
$
(1,094
)
 
$
433

 
$
(661
)
Reclassification Adjustment for Net Securities Gains Included in Net Income
(865
)
 
343

 
(522
)
Net Retirement Plan Loss
(2,218
)
 
878

 
(1,340
)
Net Retirement Plan Prior Service Cost
(405
)
 
160

 
(245
)
Amortization of Net Retirement Plan Actuarial Loss
1,677

 
(664
)
 
1,013

Accretion of Net Retirement Plan Prior Service Credit
(20
)
 
8

 
(12
)
  Other Comprehensive Income
$
(2,925
)
 
$
1,158

 
$
(1,767
)
 
 
 
 
 
 
2011
 
 
 
 
 
Unrealized Securities Holding Gains Arising During the Period
$
7,850

 
$
(3,109
)
 
$
4,741

Reclassification Adjustment for Net Securities Gains Included in Net Income
(2,795
)
 
1,107

 
(1,688
)
Net Retirement Plan Loss
(6,129
)
 
2,428

 
(3,701
)
Net Retirement Plan Prior Service Credit
(266
)
 
105

 
(161
)
Amortization of Net Retirement Plan Actuarial Loss
996

 
(394
)
 
602

Accretion of Net Retirement Plan Prior Service Credit
(108
)
 
43

 
(65
)
  Other Comprehensive Income
$
(452
)
 
$
180

 
$
(272
)
 
 
 
 
 
 
2010
 
 
 
 
 
Unrealized Securities Holding Gains Arising During the Period
$
2,507

 
$
(993
)
 
$
1,514

Reclassification Adjustment for Net Securities Gains Included in Net Income
(1,507
)
 
597

 
(910
)
Net Retirement Plan Loss
(1,811
)
 
718

 
(1,093
)
Net Retirement Plan Prior Service Cost
242

 
(96
)
 
146

Amortization of Net Retirement Plan Actuarial Loss
1,112

 
(440
)
 
672

Accretion of Net Retirement Plan Prior Service Credit
(186
)
 
74

 
(112
)
  Other Comprehensive Income
$
357

 
$
(140
)
 
$
217
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]

The following table presents the components, net of tax, of accumulated other comprehensive loss as of December 31:

 
2012
 
2011
Retirement Plan Net Loss
$
(14,036
)
 
$
(13,709
)
Retirement Plan Prior Service Credit
(51
)
 
206

Net Unrealized Securities Holding Gains
5,625

 
6,808

Total Accumulated Other Comprehensive Loss
$
(8,462
)
 
$
(6,695
)