Loans (Activity Related To Accretable Yield Of Loans Acquired With Evidence Of Credit Quality Deterioration Since Origination) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2012		Sep. 30, 2011		Sep. 30, 2012		Sep. 30, 2011
Bank Acquisitions [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]
Accretable yield, beginning balance	$ 171,801		$ 80,748		$ 173,120		$ 39,809
Acquisitions	6,052		24,695		8,340		29,797
Accretable yield amortized to interest income	(12,266)		(9,820)		(40,545)		(24,869)
Accretable yield amortized to indemnification asset	(16,472)	[1]	(4,367)	[1]	(55,912)	[1]	(17,045)	[1]
Reclassification from non-accretable difference	4,636	[2]	2,145	[2]	53,827	[2]	52,820	[2]
Increases in interest cash flows due to payments and changes in interest rates	(1,951)		(6,904)		12,970		5,985
Accretable yield, ending balance	151,800	[3]	86,497	[3]	151,800	[3]	86,497	[3]
Life Insurance Premium Finance Acquisition [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]
Accretable yield, beginning balance	14,626		24,891		18,861		33,315
Acquisitions	0		0		0		0
Accretable yield amortized to interest income	(2,309)		(5,127)		(8,795)		(19,301)
Accretable yield amortized to indemnification asset	0	[1]	0	[1]	0	[1]	0	[1]
Reclassification from non-accretable difference	2,951	[2]	0	[2]	4,096	[2]	3,857	[2]
Increases in interest cash flows due to payments and changes in interest rates	158		432		1,264		2,325
Accretable yield, ending balance	$ 15,426	[3]	$ 20,196	[3]	$ 15,426	[3]	$ 20,196	[3]

[1] Represents the portion of the current period accreted yield, resulting from lower expected losses, applied to reduce the loss share indemnification asset.

[2] Reclassification is the result of subsequent increases in expected principal cash flows.

[3] As of September 30, 2012, the Company estimates that the remaining accretable yield balance to be amortized to the indemnification asset for the bank acquisitions is $74.8 million. The remainder of the accretable yield related to bank acquisitions is expected to be amortized to interest income.