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
	Mar. 31, 2013		Mar. 31, 2012
Bank Acquisitions [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield Movement Schedule [Roll Forward]
Accretable yield, beginning balance	$ 143,224		$ 173,120
Acquisitions	(78)		2,288
Accretable yield amortized to interest income	(9,577)		(14,892)
Accretable yield amortized to indemnification asset	(8,706)	[1]	(21,377)	[1]
Reclassification from non-accretable difference	5,412	[2]	41,601	[2]
Increases in interest cash flows due to payments and changes in interest rates	(8,550)		1,482
Accretable yield, ending balance	121,725	[3]	182,222	[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	13,055		18,861
Acquisitions	0		0
Accretable yield amortized to interest income	(2,019)		(3,737)
Accretable yield amortized to indemnification asset	0	[1]	0	[1]
Reclassification from non-accretable difference	0	[2]	0	[2]
Increases in interest cash flows due to payments and changes in interest rates	182		724
Accretable yield, ending balance	$ 11,218	[3]	$ 15,848	[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 March 31, 2013, the Company estimates that the remaining accretable yield balance to be amortized to the indemnification asset for the bank acquisitions is $42.9 million. The remainder of the accretable yield related to bank acquisitions is expected to be amortized to interest income.