Goodwill And Other Intangible Assets (Summary of Finite-Lived Intangible Assets) (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2013
Finite-Lived Intangible Assets [Line Items]
Other intangible assets	$ 16,894	$ 19,213	$ 20,137
Core deposit intangibles | Community banking
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	40,770	40,770	39,350
Accumulated amortization	(31,223)	(29,189)	(27,132)
Net carrying amount	9,547	11,581	12,218
Customer list intangibles | Specialty finance
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	1,800	1,800	1,800
Accumulated amortization	(878)	(805)	(731)
Net carrying amount	922	995	1,069
Customer list and other intangibles | Wealth management
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	7,690	7,690	7,690
Accumulated amortization	(1,265)	(1,053)	(840)
Net carrying amount	$ 6,425	$ 6,637	$ 6,850