Long Term Subordinated Notes (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011
Subordinated Debt [Member]
Subordinated Borrowing [Line Items]
Percentage of principal amount required for redemption	100.00%
Redemption date	May 15, 2017
Outstanding debt reduction	$ 161,441
Pre-tax gain on debt repurchase	$ 78,271
Subordinated Debt [Member] | Minimum [Member]
Subordinated Borrowing [Line Items]
Applicable spread on treasury rate	0.25%
Subordinated Debt [Member] | Maximum [Member]
Subordinated Borrowing [Line Items]
Applicable spread on treasury rate	0.50%
Fixed Rate Interest Period [Member] | Subordinated Debt [Member]
Subordinated Borrowing [Line Items]
Annual interest rate, payable semi-annually in arrears on November 15 and May 15 of each year	6.60%
Interest payment commencement date	November 15, 2007
Interest basis, number of months LIBOR rate	3
Interest basis, 3 month LIBOR plus number of basis points, reset quarterly	238.5
Fixed Rate Interest Period [Member] | Subordinated Debt [Member] | Minimum [Member]
Subordinated Borrowing [Line Items]
Interest payment date	May 3, 2007
Fixed Rate Interest Period [Member] | Subordinated Debt [Member] | Maximum [Member]
Subordinated Borrowing [Line Items]
Interest payment date	May 14, 2017
Fixed Rate Interest Period [Member] | Junior Subordinated Debt [Member]
Subordinated Borrowing [Line Items]
Right to defer interest on one or more occasions for up to number of consecutive years	ten
Floating Rate Interest Period [Member] | Minimum [Member]
Subordinated Borrowing [Line Items]
Interest payment date	May 15, 2017
Floating Rate Interest Period [Member] | Junior Subordinated Debt [Member]
Subordinated Borrowing [Line Items]
Right to defer interest on one or more occasions for up to number of consecutive years	ten