Condensed Parent Company Information - Condensed Statements of Income (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Operating Income From subsidiaries
Income tax expense (benefit)	$ (45,613)	$ (18,064)	$ (9,705)
Net income	151,742	76,759	52,206
Hancock [Member]
Operating Income From subsidiaries
Cash dividends received from bank subsidiaries	25,000	123,100	41,500
Non-cash dividend from bank subsidiary in restructuring	225,000	13,451
Dividends received from non-bank subsidiaries	150
Equity in earnings of subsidiaries greater than (less than) dividends received	(94,486)	(57,172)	10,471
Total operating income	155,664	79,379	51,971
Other (expense) income	(6,673)	(2,592)	342
Income tax expense (benefit)	(2,751)	28	107
Net income	$ 151,742	$ 76,759	$ 52,206