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Comprehensive Income (Tables)
 6 Months Ended
Jun. 30, 2012
Comprehensive Income [Abstract]  
Schedule of Comprehensive Income (Loss) [Table Text Block]
Schedule of Comprehensive Income
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
 
 
Tax
 
 
 
 
 
Tax
 
 
 
Before-Tax
 
(Expense)
 
Net-of-Tax
 
Before-Tax
 
(Expense)
 
Net-of-Tax
 
Amount
 
Benefit
 
Amount
 
Amount
 
Benefit
 
Amount
2012
 
 
 
 
 
 
 
 
 
 
 
Net Unrealized Securities Holding Gains Arising During the Period
$
739

 
$
(294
)
 
$
445

 
$
577

 
$
(230
)
 
$
347

Reclassification Adjustment for Securities Gains Included in Net Income
(143
)
 
57

 
(86
)
 
(645
)
 
256

 
(389
)
Amortization of Net Retirement Plan Actuarial Loss
379

 
(150
)
 
229

 
757

 
(300
)
 
457

Accretion of Net Retirement Plan Prior Service Credit
(8
)
 
3

 
(5
)
 
(15
)
 
6

 
(9
)
  Other Comprehensive Loss
$
967

 
$
(384
)
 
$
583

 
$
674

 
$
(268
)
 
$
406

 
 
 
 
 
 
 
 
 
 
 
 
2011
 
 
 
 
 
 
 
 
 
 
 
Net Unrealized Securities Holding Gains Arising During the Period
$
4,324

 
$
(1,713
)
 
$
2,611

 
$
6,272

 
$
(2,485
)
 
$
3,787

Reclassification Adjustment for Securities Gains Included in Net Income
(482
)
 
191

 
(291
)
 
(1,024
)
 
406

 
(618
)
Amortization of Net Retirement Plan Actuarial Loss
257

 
(102
)
 
155

 
512

 
(203
)
 
309

Accretion of Net Retirement Plan Prior Service Credit
(32
)
 
13

 
(19
)
 
(63
)
 
25

 
(38
)
  Other Comprehensive Income
$
4,067

 
$
(1,611
)
 
$
2,456

 
$
5,697

 
$
(2,257
)
 
$
3,440
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
Schedule of Accumulated Other Comprehensive Income (Loss)
 
June 30,
2012
 
December 31,
2011
 
June 30,
2011
Retirement Plan Net Loss
$
(13,252
)
 
$
(13,709
)
 
$
(10,648
)
Retirement Plan Prior Service Credit
197

 
206

 
741

Net Unrealized Securities Holding Gains
6,766

 
6,808

 
6,924

Total Accumulated Other Comprehensive Loss
$
(6,289
)
 
$
(6,695
)
 
$
(2,983
)