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		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Allowance for Covered Loan Losses [Roll Forward]
Balance at beginning of period	$ 3,447	$ 12,272	$ 10,092	$ 13,454
Provision for covered loan losses before benefit attributable to FDIC loss share agreements	(764)	1,246	(7,885)	2,846
Benefit attributable to FDIC loss share agreements	611	(997)	6,308	(2,277)
Net provision for covered loan losses	(153)	249	(1,577)	569
(Decrease) increase in FDIC indemnification asset	(611)	997	(6,308)	2,277
Loans charged-off	(2,189)	(2,266)	(5,053)	(5,057)
Recoveries of loans charged-off	1,173	3,177	4,513	3,186
Net recoveries (charge-offs)	(1,016)	911	(540)	(1,871)
Balance at end of period	$ 1,667	$ 14,429	$ 1,667	$ 14,429