Goodwill And Other Intangible Assets (Summary of Finite-Lived Intangible Assets) (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013
Finite-Lived Intangible Assets [Line Items]
Other intangible assets	$ 18,050	$ 19,213	$ 19,510
Core deposit intangibles | Community banking
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	40,770	40,770	37,860
Accumulated amortization	(30,209)	(29,189)	(26,127)
Net carrying amount	10,561	11,581	11,733
Customer list intangibles | Specialty finance
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	1,800	1,800	1,800
Accumulated amortization	(842)	(805)	(688)
Net carrying amount	958	995	1,112
Customer list and other intangibles | Wealth management
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	7,690	7,690	7,390
Accumulated amortization	(1,159)	(1,053)	(725)
Net carrying amount	$ 6,531	$ 6,637	$ 6,665