Shareholders' Equity (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified	0 Months Ended	1 Months Ended	12 Months Ended
	Aug. 17, 2006	Dec. 31, 2006	Dec. 31, 2007	Dec. 31, 2014	Dec. 24, 2008
Dividends:
Amount of additional dividends the bank could have declared				$ 172.9
Amended and Restated Dividend Reinvestment and Stock Purchase Plan [Member]
Reserved Shares:
Reserved shares available for grant					607,500
2006 Rights Agreement [Member]
Shareholder Rights Plan:
Number of rights per outstanding share of common stock	1
Number of securities called by rights	1
Exercise price of shares	$ 100
Days after an acquiring person acquired beneficial ownership causing rights to become exercisable	10 days
Percentage acquistion of company's common stock causing rights to become exercisable	15.00%
Exercise price per right available to company prior to expiration	0.01
Exercise price percentage per right in event a party becomes an acquiring person	200.00%
Exercise price percentage per right in event company is acquired	200.00%
Reserved Shares:
Reserved shares available for grant				2,671,274
2006 Stock Repurchase Plan [Member]
Stock Repurchase Program:
Authorized amount (in shares)		400,000
Authorized amount as a percentage of total common stock		3.00%
Cumulative amount of shares purchased				185,400
Shares repurchased, value			$ 4.8