Fair Values Of Assets And Liabilities (Summary Of Changes In Level 3 Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Detail) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Mortgage Servicing Rights
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance		$ 8,034	$ 8,227	$ 8,435	$ 8,946
Total net gains (losses) included in Net income	[1]	(159)	(90)	(560)	(809)
Net transfers into/(out of) Level 3	[2]		0
Ending Balance		7,875	8,137	7,875	8,137
Municipal
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance		58,572	38,053	58,953	36,386
Total net gains (losses) included in Other comprehensive income		223	(27)	(287)	193
Purchases		10,405	4,129	21,254	9,095
Settlements		(799)	(800)	(11,519)	(4,319)
Net transfers into/(out of) Level 3	[2]		8,882		8,882
Ending Balance		68,401	50,237	68,401	50,237
Equity securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance		24,996	24,152	23,711	22,163
Total net gains (losses) included in Other comprehensive income		(480)	(191)	805	1,798
Net transfers into/(out of) Level 3	[2]		0
Ending Balance		$ 24,516	$ 23,961	$ 24,516	$ 23,961

[1] Changes in the balance of mortgage servicing rights are recorded as a component of mortgage banking revenue in non-interest income.

[2] Transfers into Level 3 relate to a reclassification of municipal bonds in the current quarter.