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Shareholders' Equity (Tables)
 3 Months Ended
Mar. 31, 2013
Stockholders' Equity Note [Abstract]  
Accumulated Other Comprehensive Income (Loss) [Table Text Block]
A rollforward of the components of accumulated other comprehensive income (loss) is included as follows (in thousands):
 
 
Unrealized Gain (Loss) on
 
 
 
 
 
 
Available for Sale Securities
 
Investment Securities Transferred from AFS
 
Employee Benefit Plans
 
Loss on Effective Cash Flow Hedges
 
Total
Balance, December 31, 2011
 
$
135,740

 
$
6,673

 
$
(12,742
)
 
$
(692
)
 
$
128,979

Net change in unrealized gain (loss)
 
55,726

 
—

 
(291
)
 
—

 
55,435

Reclassification adjustments included in earnings:
 
 
 
 
 
 
 
 
 
 
Interest revenue, Investment securities, Taxable securities
 
—

 
(1,788
)
 
—

 
—

 
(1,788
)
Interest expense, Subordinated debentures
 
—

 
—

 
—

 
52

 
52

Net impairment losses recognized in earnings
 
3,722

 
—

 
—

 
—

 
3,722

Gain on available for sale securities, net
 
(4,331
)
 
—

 
—

 
—

 
(4,331
)
Other comprehensive income (loss), before income taxes
 
55,117

 
(1,788
)
 
(291
)
 
52

 
53,090

Income tax expense (benefit)1
 
(21,441
)
 
697

 
113

 
(20
)
 
(20,651
)
Other comprehensive income (loss), net of income taxes
 
33,676

 
(1,091
)
 
(178
)
 
32

 
32,439

Balance, March 31, 2012
 
$
169,416

 
$
5,582

 
$
(12,920
)
 
$
(660
)
 
$
161,418

 
 
 
 
 
 
 
 
 
 
 
Balance, December 31, 2012
 
$
155,553

 
$
3,078

 
$
(8,296
)
 
$
(415
)
 
$
149,920

Net change in unrealized gains (losses)
 
(21,359
)
 
—

 
—

 
—

 
(21,359
)
Reclassification adjustments included in earnings:
 
 
 
 
 
 
 
 
 
 
Interest revenue, Investment securities, Taxable securities
 
—

 
(1,148
)
 
—

 
—

 
(1,148
)
Interest expense, Subordinated debentures
 
—

 
—

 
—

 
52

 
52

Net impairment losses recognized in earnings
 
247

 
—

 
—

 
—

 
247

Gain on available for sale securities, net
 
(4,855
)
 
—

 
—

 
—

 
(4,855
)
Other comprehensive income (loss), before income taxes
 
(25,967
)
 
(1,148
)
 
—

 
52

 
(27,063
)
Income tax benefit (expense)1
 
10,100

 
446

 
—

 
(20
)
 
10,526

Other comprehensive income (loss), net of income taxes
 
(15,867
)
 
(702
)
 
—

 
32

 
(16,537
)
Balance, March 31, 2013
 
$
139,686

 
$
2,376

 
$
(8,296
)
 
$
(383
)
 
$
133,383