Goodwill And Other Intangible Assets (Summary of Finite-Lived Intangible Assets) (Detail) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015	Sep. 30, 2015
Finite-Lived Intangible Assets [Line Items]
Total other intangible assets, net	$ 20,736	$ 24,209	$ 25,533
Core deposit intangibles | Community banking
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	34,998	34,841	34,840
Accumulated amortization	(20,598)	(17,382)	(16,195)
Net carrying amount	14,400	17,459	18,645
Customer list intangibles | Specialty finance
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	1,800	1,800	1,800
Accumulated amortization	(1,129)	(1,052)	(1,027)
Net carrying amount	671	748	773
Customer list and other intangibles | Wealth management
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	7,940	7,940	7,940
Accumulated amortization	(2,275)	(1,938)	(1,825)
Net carrying amount	$ 5,665	$ 6,002	$ 6,115