Long Term Subordinated Notes (Outstanding Fixed To Floating Rate Long Term Subordinated Notes) (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Subordinated Borrowing [Line Items]
Consolidated Balance Sheet Amount	$ 238,354,000	$ 238,351,000
Subordinated Debt [Member]
Subordinated Borrowing [Line Items]
Date Issued	04/26/2007
Original Principal Amount	400,000,000
Consolidated Balance Sheet Amount	238,354,000	238,351,000
Market Value	$ 210,195,000	$ 227,825,000
Scheduled [Member] | Subordinated Debt [Member]
Subordinated Borrowing [Line Items]
Maturity Date	May 15, 2037
Final [Member] | Subordinated Debt [Member]
Subordinated Borrowing [Line Items]
Maturity Date	May 01, 2067