Goodwill And Other Intangible Assets (Summary of Finite-Lived Intangible Assets) (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014	Jun. 30, 2014
Finite-Lived Intangible Assets [Line Items]
Total other intangible assets, net	$ 17,924	$ 18,811	$ 16,894
Core deposit intangibles | Community banking
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	25,881	29,379	40,770
Accumulated amortization	(14,983)	(17,879)	(31,223)
Net carrying amount	10,898	11,500	9,547
Customer list intangibles | Specialty finance
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	1,800	1,800	1,800
Accumulated amortization	(1,001)	(941)	(878)
Net carrying amount	799	859	922
Customer list and other intangibles | Wealth management
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	7,940	7,940	7,690
Accumulated amortization	(1,713)	(1,488)	(1,265)
Net carrying amount	$ 6,227	$ 6,452	$ 6,425