Goodwill And Other Intangible Assets (Summary of Finite-Lived Intangible Assets) (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012
Finite-Lived Intangible Assets [Line Items]
Other intangible assets	$ 18,982	$ 20,947	$ 22,405
Core deposit intangibles | Community banking
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	39,350	38,176	38,501
Accumulated amortization	(28,143)	(25,159)	(24,178)
Net carrying amount	11,207	13,017	14,323
Customer list intangibles | Specialty finance
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	1,800	1,800	1,800
Accumulated amortization	(769)	(645)	(603)
Net carrying amount	1,031	1,155	1,197
Customer list and other intangibles | Wealth management
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	7,690	7,390	7,390
Accumulated amortization	(946)	(615)	(505)
Net carrying amount	$ 6,744	$ 6,775	$ 6,885