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		6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Mortgage Servicing Rights
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance		$ 7,852	$ 8,719	$ 8,435	$ 8,946
Total net gains (losses) included in Net income	[1]	182	(492)	(401)	(719)
Ending Balance		8,034	8,227	8,034	8,227
Municipal
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance		56,049	39,772	58,953	36,386
Total net gains (losses) included in Other comprehensive income		(713)	73	(510)	220
Purchases		4,175	1,606	10,849	4,966
Settlements		(939)	(3,398)	(10,720)	(3,519)
Ending Balance		58,572	38,053	58,572	38,053
Equity securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance		24,656	23,438	23,711	22,163
Total net gains (losses) included in Other comprehensive income		340	714	1,285	1,989
Ending Balance		$ 24,996	$ 24,152	$ 24,996	$ 24,152

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