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, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Mortgage Servicing Rights
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	$ 10,128	$ 7,852	$ 9,092	$ 8,435
Total net gains (losses) included in Net income	3,254	182	4,290	(401)
Total net gains (losses) included in Other comprehensive income		0		0
Purchases		0		0
Settlements		0		0
Net transfers into/(out of) Level 3		0	0	0
Ending Balance	13,382	8,034	13,382	8,034
Municipal
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	70,242	56,049	68,613	58,953
Total net gains (losses) included in Net income		0		0
Total net gains (losses) included in Other comprehensive income	113	(713)	100	(510)
Purchases	1,003	4,175	4,274	10,849
Settlements	(1,546)	(939)	(3,175)	(10,720)
Net transfers into/(out of) Level 3		0		0
Ending Balance	69,812	58,572	69,812	58,572
Equity securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	24,054	24,656	25,199	23,711
Total net gains (losses) included in Net income		0		0
Total net gains (losses) included in Other comprehensive income	1,133	340	(12)	1,285
Purchases		0		0
Settlements		0		0
Net transfers into/(out of) Level 3		0	0	0
Ending Balance	$ 25,187	$ 24,996	$ 25,187	$ 24,996