Goodwill And Other Intangible Assets (Summary of Finite-Lived Intangible Assets) (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015	Jun. 30, 2015
Finite-Lived Intangible Assets [Line Items]
Total other intangible assets, net	$ 21,821	$ 24,209	$ 17,924
Core deposit intangibles | Community banking
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	34,998	34,841	25,881
Accumulated amortization	(19,654)	(17,382)	(14,983)
Net carrying amount	15,344	17,459	10,898
Customer list intangibles | Specialty finance
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	1,800	1,800	1,800
Accumulated amortization	(1,100)	(1,052)	(1,001)
Net carrying amount	700	748	799
Customer list and other intangibles | Wealth management
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	7,940	7,940	7,940
Accumulated amortization	(2,163)	(1,938)	(1,713)
Net carrying amount	$ 5,777	$ 6,002	$ 6,227