Related Party Transactions - Additional Information (Detail) (USD $)	1 Months Ended	12 Months Ended
	Jun. 30, 2009	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2011 During Deconversion Period	Dec. 31, 2010 During Deconversion Period	Dec. 31, 2011 Beyond Deconversion Period	Dec. 31, 2010 Beyond Deconversion Period	Dec. 31, 2011 Vantiv, LLC	Dec. 31, 2010 Vantiv, LLC	Dec. 31, 2009 Vantiv, LLC
Related Party Transaction [Line Items]
Income recognized on Equity method investments in Vantiv, LLC		$ 57,000,000	$ 26,000,000
Dividend on Equity method investment in Vantiv, LLC		3,000,000	25,000,000
Percentage of Processing Business sold to Advent for cash and warrants	51.00%
Percentage of Processing Business Bancorp retained	49.00%
Loans assumed by Vantiv, LLC	1,250,000,000
Service fee received from Vantiv, LLC				21,000,000	49,000,000	37,000,000	34,000,000
Service fee paid to Vantiv, LLC		74,000,000	64,000,000
Loans to related parties		172,000,000	74,000,000					377,000,000	381,000,000
Line Of Credit		4,744,000,000	5,516,000,000					50,000,000	50,000,000
Loan Processing Fee			4,000,000
Interest income relating to the Vantiv, LLC loans								$ 18,000,000	$ 102,000,000	$ 60,000,000