Shareholders' Equity and Stock-Based Compensation Plans (Tables)

12 Months Ended

Dec. 31, 2011

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Schedule of Comprehensive Income (Loss) [Table Text Block]

The following table presents changes in accumulated other comprehensive income (loss):

	2011			2010			2009
	(in thousands)
Balance at beginning of year	$	12,495		$	7,458		$	(17,907	)
Cumulative effect of FSP FAS 115-2 and FAS 124-2 adoption (net of a $3.4 million tax effect)	—			—			(6,298		)
Other comprehensive loss (income):
Unrealized gain on securities (net of a $4.7 million, $2.2 million and $15.9 million tax effect in 2011, 2010 and 2009, respectively)	8,768			3,994			29,550
Non-credit related unrealized gain (loss) on other-than-temporarily impaired debt securities (net of a $129,000, $89,000 and $1.8 million tax effect in 2011, 2010 and 2009, respectively)	240			(166		)	(3,385		)
Amortization of unrealized gain on derivative financial instruments (net of a $73,000 tax effect in 2011, 2010 and 2009) (1)	136			136			136
Reclassification adjustment for securities gains included in net income (net of a $1.6 million, $245,000 and $378,000 tax expense in 2011, 2010 and 2009, respectively)	(2,964		)	(455		)	(701		)
Unrecognized pension and postretirement (costs) income (net of a $5.7 million, $783,000 and $3.0 million tax effect in 2011, 2010 and 2009, respectively)	(10,672		)	1,454			5,592
(Accretion) amortization of unrecognized pension and postretirement costs (net of a $26,000, $40,000 and $253,000 tax benefit in 2011, 2010 and 2009, respectively)	(48		)	74			471
Other comprehensive (loss) income	(4,540		)	5,037			31,663
Balance at end of year	$	7,955		$	12,495		$	7,458

Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]

The following table provides information about stock option activity for the year ended December 31, 2011:

	Stock Options		Weighted Average Exercise Price		Weighted Average Remaining Contractual Term	Aggregate Intrinsic Value (in millions)
Outstanding as of December 31, 2010	6,432,264		$	13.15
Granted	616,686		10.88
Exercised	(261,272	)	7.48
Forfeited	(116,472	)	12.61
Expired	(289,048	)	11.08
Outstanding as of December 31, 2011	6,382,158		$	13.27	4.7 years	$	2.4
Exercisable as of December 31, 2011	5,294,042		$	14.01	3.8 years	$	1.6

Schedule of Nonvested Share Activity [Table Text Block]

The following table provides information about nonvested stock options and restricted stock granted under the Employee Option and Directors' Plans for the year ended December 31, 2011:

	Nonvested Stock Options				Restricted Stock
	Options		Weighted Average Grant Date Fair Value		Shares		Weighted Average Grant Date Fair Value
Nonvested as of December 31, 2010	981,766		$	1.48	525,868		$	7.92
Granted	616,686		2.10		352,091		10.52
Vested	(451,817	)	1.40		(54,671	)	9.89
Forfeited	(58,519	)	1.74		(13,401	)	8.56
Nonvested as of December 31, 2011	1,088,116		$	1.86	809,887		$	8.90

Schedule Of Options Exercised [Table Text Block]

The following table presents information about options exercised:

	2011		2010		2009
	(dollars in thousands)
Number of options exercised	261,272		162,151		121,155
Total intrinsic value of options exercised	$	763	$	600	$	317
Cash received from options exercised	$	1,855	$	962	$	662
Tax deduction realized from options exercised	$	680	$	466	$	286

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

The fair value of option awards under the Employee Option Plan was estimated on the date of grant using the Black-Scholes valuation methodology, which is dependent upon certain assumptions, as summarized in the following table:

	2011		2010		2009
Risk-free interest rate	2.35	%	2.23	%	3.36	%
Volatility of Corporation’s stock	22.80		20.40		31.14
Expected dividend yield	2.41		2.49		2.28
Expected life of options	6 Years		6 Years		7 Years

Schedule of Share-based Compensation, Employee Stock Purchase Plan, Activity [Table Text Block]

The following table summarizes activity under the ESPP:

	2011		2010		2009
ESPP shares purchased	164,610		184,092		261,691
Average purchase price per share (85% of market value)	$	8.39	$	7.93	$	5.46
Compensation expense recognized (in thousands)	$	244	$	258	$	252

Stock Options [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Summary of Compensation Expense and Related Tax Benefits

The following table presents compensation expense and related tax benefits for equity awards recognized in the consolidated statements of operations:

	2011			2010			2009
	(in thousands)
Compensation expense	$	4,249		$	1,996		$	1,781
Tax benefit	(1,192		)	(456		)	(241		)
Stock-based compensation, net of tax	$	3,057		$	1,540		$	1,540

Restricted Stock [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Summary of Compensation Expense and Related Tax Benefits

The following table presents compensation expense and related tax benefits for restricted stock awards recognized in the consolidated statements of operations, and included as a component of total stock-based compensation within the preceding table:

	2011			2010			2009
	(in thousands)
Compensation expense	$	3,194		$	1,172		$	458
Tax benefit	(1,119		)	(412		)	(164		)
Restricted stock compensation, net of tax	$	2,075		$	760		$	294