Securities (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012 security	Dec. 31, 2011
Schedule of Available-for-sale Securities [Line Items]
Securities pledged to secure public deposits, and for other purposes required or permitted by law	$ 122.1	$ 153.5
Available for sale securities, number of securities	74
Residential Mortgage-Backed Securities [Member] | Maximum [Member]
Schedule of Available-for-sale Securities [Line Items]
Contractual maturity period, years	50 years
Anticipated average life to maturity period, years	35 years
Residential Mortgage-Backed Securities [Member] | Minimum [Member]
Schedule of Available-for-sale Securities [Line Items]
Contractual maturity period, years	1 year
Anticipated average life to maturity period, years	1 year