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
	Mar. 31, 2016	Mar. 31, 2015
Mortgage Servicing Rights
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	$ 9,092	$ 8,435
Total net gains (losses) included in Net income	1,036	(583)	[1]
Net transfers into/(out of) Level 3		0
Ending Balance	10,128	7,852
Municipal
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	68,613	58,953
Total net gains (losses) included in Other comprehensive income	(13)	203
Purchases	3,271	6,674
Settlements	(1,629)	(9,781)
Ending Balance	70,242	56,049
Equity securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	25,199	23,711
Total net gains (losses) included in Other comprehensive income	(1,145)	945
Net transfers into/(out of) Level 3		0
Ending Balance	$ 24,054	$ 24,656

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