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, unless otherwise specified	3 Months Ended
	Mar. 31, 2014		Mar. 31, 2013
Mortgage Servicing Rights [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	$ 8,946		$ 6,750
Total net gains (losses) included in Net income	(227)	[1]	594	[1]
Total net gains (losses) included in Other comprehensive income
Purchases
issuances
Sales
Settlements
Net transfers into Level 3
Ending Balance	8,719		7,344
Municipal Bonds [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	36,386		30,770
Total net gains (losses) included in Net income
Total net gains (losses) included in Other comprehensive income	147		(12)
Purchases	3,360		1,687
issuances
Sales
Settlements	(121)		(121)
Net transfers into Level 3
Ending Balance	39,772		32,324
Equity Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	22,163		22,169
Total net gains (losses) included in Net income
Total net gains (losses) included in Other comprehensive income	1,275		2,301
Purchases
issuances
Sales
Settlements
Net transfers into Level 3
Ending Balance	$ 23,438		$ 24,470

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