Allowance for Loan Losses, Allowance for Losses on Lending-Related Commitments and Impaired Loans Allowance for Loan Losses, Allowance for Losses on Lending-Related Commitments and Impaired Loans (Summary Of Activity In The Allowance For Covered Loan Losses) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Allowance for Covered Loan Losses [Roll Forward]
Balance at beginning of period	$ 10,092	$ 13,454
Provision for covered loan losses before benefit attributable to FDIC loss share agreements	(7,121)	1,600
Benefit attributable to FDIC loss share agreements	(5,697)	1,280
Net provision for covered loan losses	(1,424)	320
(Decrease) increase in FDIC indemnification asset	(5,697)	1,280
Loans charged-off	2,864	2,791
Recoveries of loans charged-off	3,340	9
Net recoveries (charge-offs)	(476)	2,782
Balance at end of period	$ 3,447	$ 12,272