Securities (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2012 security
Schedule of Available-for-sale Securities [Line Items]
Number Of Issuances Of Securities Exceeding Shareholders Equity Threshold		0
U.S. Government and Government-Sponsored Enterprise Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Number Of Securities In Unrealized Loss Position		5
Number Of Securities In Continuous Loss Position For Twelve Months or More		0
US Treasury Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Number Of Securities In Unrealized Loss Position		1
Other Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Issuances Of Securities Exceeding Shareholders Equity Threshold, Percent		10.00%
Number Of Securities In Continuous Loss Position For Twelve Months or More		1
U.S. Government Agency and Government-Sponsored Enterprise Mortgage-Backed Securities and Collateralized Mortgage Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Number Of Securities In Unrealized Loss Position		17
Number Of Securities In Continuous Loss Position For Twelve Months or More		1
Municipal Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Number Of Securities In Unrealized Loss Position		14
Number Of Securities In Continuous Loss Position For Twelve Months or More		1
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net, Available-for-sale Securities	$ 3.0