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				9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2013		Sep. 30, 2012
Mortgage Servicing Rights [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	$ 8,636		$ 6,647		$ 6,750		$ 6,700
Total net gains (losses) included in Net income	(28)	[1]	(371)	[1]	1,858	[1]	(424)	[1]
Total net gains (losses) included in Other comprehensive income
Purchases
issuances
Sales
Settlements
Net transfers into Level 3
Ending Balance	8,608		6,276		8,608		6,276
Municipal Bonds [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	32,432		25,537		30,770		24,211
Total net gains (losses) included in Net income
Total net gains (losses) included in Other comprehensive income	(2)		14		(316)		50
Purchases	6,225		10,204		8,572		14,044
issuances
Sales
Settlements	(5,967)		0		(6,338)		(148)
Net transfers into Level 3			0	[2]			(2,402)	[2]
Ending Balance	32,688		35,755		32,688		35,755
Equity Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	22,428		20,218		22,169		18,971
Total net gains (losses) included in Net income
Total net gains (losses) included in Other comprehensive income	(1,986)		2,037		(1,727)		3,284
Purchases
issuances
Sales
Settlements
Net transfers into Level 3
Ending Balance	$ 20,442		$ 22,255		$ 20,442		$ 22,255

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

[2] Equity securities Mortgageservicing rights(Dollars in thousands)Municipal Balance at January 1, 2012$24,211 $18,971 $6,700Total net gains (losses) included in: Net loss (1)— — (424)Other comprehensive income50 3,284 —Purchases14,044 — —Issuances— — —Sales— — —Settlements(148) — —Net transfers out of Level 3 (2)(2,402) — —Balance at September 30, 2012$35,755 $22,255 $6,276