Related Party Transactions (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Related Party Transactions [Abstract]
Related party indebtedness	$ 3.7	$ 3.4
New loans and advances on existing loans	3.5
Related party loan repayments	3.3
Related party deposits	2.4	3.3
Related party savings and interest-bearing transaction accounts	12.3	9.8
Related party time certificates of deposit	$ 0.8	$ 1.2