Loans and Leases (Schedule of Changes in Accretable Discount Related to Credit Impaired Acquired Loans) (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
Disclosure Loans And Leases Schedule Of Changes In Accretable Discount Related To Credit Impaired Acquired Loans [Abstract]
Balance - beginning of period	$ 43,058	$ 58,817	$ 46,219	$ 62,868
Accretion recognized during the period	(2,572)	(5,723)	(5,733)	(12,293)
Net reclassification from non-accretable to accretable	2,833	(3,907)	2,833	(1,388)
Balance - end of period	$ 43,319	$ 49,187	$ 43,319	$ 49,187