Stockholders Equity (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Stockholders Equity [Abstract]
Unrecognized prior service cost and net actuarial loss on pension plans	$ (24,633,000)	$ (16,251,000)
Unrealized net holding gains on available for sale securities	18,529,000	10,916,000
Accumulated other comprehensive (loss) income	(6,104,000)	(5,335,000)
Class of Warrant or Right [Line Items]
Future dividend payment restrictions	The approval of the Office of Comptroller of the Currency OCC is required to pay dividends when a bank fails to meet certain minimum regulatory capital standards or when such dividends are in excess of a subsidiary bank's earnings retained in the current year plus retained net profits for the preceding two years as specified in applicable OCC regulations.
Statutory amount available for dividend payments	$ 95,900,000
Stockholder Rights Plan [Member]
Class of Warrant or Right [Line Items]
Preferred Share Purchase Right dividend per common share (in shares)	1
Beneficial ownership of outstanding common stock basis for right exercise, minimum (in hundredths)	15.00%
Tender or exchange offer of outstanding common stock rights to exercise, minimum (in hundredths)	15.00%
Market value of additional equity interests rights, description	two times the Right's exercise price of 70
Preferred Share Purchase Right exercise price (in dollars per right)	$ 0.001
Stockholder Rights Plan [Member] | Series A Junior Participating Preferred Stock [Member]
Class of Warrant or Right [Line Items]
Purchase entitlement (in shares)	0.01
Stated value of purchase entitlement (in dollars per share)	$ 0.01
Exercise price (in dollars per share)	$ 70