Off-Balance Sheet Credit Risk (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
Fair value of securities accepted as collateral permitted to sell or repledge	$ 1,200,000,000	$ 965,800,000
Fair value of collateral securities sold or repledged	263,800,000	140,300,000
Outstanding commitments to originate loans	66,800,000	241,500,000
Letters of credit outstanding	5,100,000	10,500,000
Unused lines of Credit [Member]
Unused lines of credit to commercial and consumer borrowers	$ 282,000,000	$ 220,100,000