Number of Shares to be issued upon Exercise of Outstanding Stock-Based Awards and Remaining Shares Available for Future Issuance under all Equity Compensation Plans (Parenthetical) (Detail) - $ / shares shares in Thousands	12 Months Ended
	Dec. 31, 2009	Dec. 31, 2007	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
Outstanding options awarded in connection with mergers and acquisitions			119	265	546	3,877
Weighted-average exercise price of the outstanding options			$ 14.97	$ 14.25	$ 20.72	$ 45.00
Number of shares to be issued based on predefined performance targets			8,659
Additional shares approved by shareholders included under Bancorp's 1993 Stock Purchase Plan	12,000	1,500
Performance Units
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
Number of shares to be issued based on predefined performance targets			1,000
Series of Individually Immaterial Business Acquisitions
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
Outstanding options awarded in connection with mergers and acquisitions			100
Weighted-average exercise price of the outstanding options			$ 13.89
2014 Incentive Compensation Plan
Employee Stock Ownership Plan (ESOP) Disclosures [Line Items]
Stock authorized for issuance				36,000