Business Combinations (Summary Of FDIC Indemnification Asset) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
FDIC Indemnification Asset [Roll Forward]
Balance at beginning of period	$ 85,672	$ 208,160
Additions from acquisitions	0	0
Additions from reimbursable expenses	1,282	5,033
Amortization	(1,603)	(2,468)
Changes in expected reimbursements from the FDIC for changes in expected credit losses	(15,384)	(26,097)
Payments received from the FDIC	9,669	13,932
Balance at end of period	$ 60,298	$ 170,696