Shareholders' Equity - (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employee stock ownership plan (ESOP), maximum annual contribution per employee percent	0.1
Employee Stock Ownership Plan (ESOP), Shares Authorized	250,000
Outstanding (in shares)	261,000
Stock repurchased during period, shares	19,000	22,000	22,000
Employee stock ownership plan (ESOP), weighted average purchase price of shares purchased	$ 15.29	$ 12.49	$ 7.98
Preferred stock, shares authorized	2,500,000	2,500,000
Preferred stock, par or stated value per share	$ 0.01
Stock Employee Compensation Trust (SECT) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common Stock, Shares Held in Employee Trust, Shares	3,300,000	3,300,000	3,300,000
Omnibus Stock Trust (OST) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common Stock, Shares Held in Employee Trust, Shares	59,000	59,000	59,000