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Derivatives (Tables)
9 Months Ended
Sep. 30, 2011
Derivative [Line Items] 
Schedule Of Accumulated Other Comprehensive Income (Loss)
 
September 30, 2011
 
December 31, 2010
 
September 30, 2010
 
Accumulated
other
comprehensive
income (loss)
 
Deferred
tax
expense
(benefit)
 
Accumulated
other
comprehensive
income (loss),
net of tax
 
Accumulated
other
comprehensive
income (loss)
 
Deferred
tax
expense
(benefit)
 
Accumulated
other
comprehensive
income (loss),
net of tax
 
Accumulated
other
comprehensive
income (loss)
 
Deferred
tax
expense
(benefit)
 
Accumulated
other
comprehensive
income (loss),
net of tax
Unrealized gains on investment securities available for sale
$
28,830

 
$
11,340

 
$
17,490

 
$
23,195

 
$
9,143

 
$
14,052

 
$
41,026

 
$
15,427

 
$
25,599

Funded status of defined benefit plan
(68,752
)
 
(26,923
)
 
(41,829
)
 
(73,696
)
 
(28,859
)
 
(44,837
)
 
(67,884
)
 
(26,583
)
 
(41,301
)
Unrealized loss on cash flow hedge
(13,531
)
 
(5,343
)
 
(8,188
)
 
(9,492
)
 
(3,748
)
 
(5,744
)
 
(14,263
)
 
(5,632
)
 
(8,631
)
Total
$
(53,453
)
 
$
(20,926
)
 
$
(32,527
)
 
$
(59,993
)
 
$
(23,464
)
 
$
(36,529
)
 
$
(41,121
)
 
$
(16,788
)
 
$
(24,333
)
Interest Rate Swap [Member]
 
Derivative [Line Items] 
Schedule Of Interest Rate Swaps
 
 
 
Estimated fair value of liability
 
Notional amount
for all periods
 
September 30, 2011
 
December 31, 2010
 
September 30, 2010
2006 interest rate swap hedging variable rate exposure on trust preferred capital securities 2006-2011
$
115,000

 
$
—

 
$
2,873

 
$
4,304

2009 interest rate swap hedging variable rate exposure on trust preferred capital securities 2011-2016
115,000

 
13,531

 
6,619

 
9,959

 
 
 
$
13,531

 
$
9,492

 
$
14,263

Schedule Of Accumulated Other Comprehensive Income (Loss)
 
2011
 
2010
Accumulated other comprehensive loss resulting from interest rate swaps as of January 1
$
(9,492
)
 
$
(5,367
)
Other comprensive income (loss) recognized during nine month period ended September 30
(4,039
)
 
(8,896
)
Accumulated other comprehensive loss resulting from interest rate swaps as of September 30
$
(13,531
)
 
$
(14,263
)