Shareholders' Equity (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified			0 Months Ended	1 Months Ended	12 Months Ended
	Dec. 31, 2012 statutory_trust	Dec. 24, 2008 Amended and Restated Dividend Reinvestment and Stock Purchase Plan [Member]	Aug. 17, 2006 2006 Rights Agreement [Member] right	Dec. 31, 2006 2006 Stock Repurchase Plan [Member]	Dec. 31, 2007 2006 Stock Repurchase Plan [Member]	Dec. 31, 2012 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
Shareholder Rights Plan:
Number of rights per outstanding share of common stock			1
Number of securities called by rights			1
Exercise price of shares			100.00
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%
Dividends:
Amount of additional dividends the bank could have declared	$ 152.2
Reserved Shares:
Reserved shares available for grant	1,402,639	607,500
Regulatory Capital Requirements:
Number of sponsored statutory trusts	3