Derivative Financial Instruments (Schedule Of Fair Value Of Derivative Financial Instruments) (Detail) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021	Sep. 30, 2021
Derivative [Line Items]
Derivative Assets	$ 313,480	$ 165,008	$ 191,612
Derivative Liabilities	357,170	123,000	161,314
Interest rate contract
Derivative [Line Items]
Derivative Assets	299,298	152,493	169,315
Derivative Liabilities	353,426	119,907	157,578
Designated as hedging instrument
Derivative [Line Items]
Derivative Assets	18,268	48,783	38,368
Derivative Liabilities	71,427	16,242	26,481
Designated as hedging instrument | Interest rate contract | Interest rate derivatives designated as Cash Flow Hedges
Derivative [Line Items]
Derivative Assets	725	47,309	37,529
Derivative Liabilities	71,427	10,401	18,054
Designated as hedging instrument | Interest rate contract | Interest rate derivatives designated as Fair Value Hedges
Derivative [Line Items]
Derivative Assets	17,543	1,474	839
Derivative Liabilities	0	5,841	8,427
Not designated as hedging instrument
Derivative [Line Items]
Derivative Assets	295,212	116,225	153,244
Derivative Liabilities	285,743	106,758	134,833
Not designated as hedging instrument | Interest rate contract
Derivative [Line Items]
Derivative Assets	281,030	103,710	130,947
Derivative Liabilities	281,999	103,665	131,097
Not designated as hedging instrument | Interest rate lock commitments
Derivative [Line Items]
Derivative Assets	141	10,560	16,795
Derivative Liabilities	273	885	753
Not designated as hedging instrument | Forward commitments to sell mortgage loans
Derivative [Line Items]
Derivative Assets	10,896	1,625	5,260
Derivative Liabilities	326	1,878	2,740
Not designated as hedging instrument | Foreign exchange contracts
Derivative [Line Items]
Derivative Assets	3,145	330	242
Derivative Liabilities	$ 3,145	$ 330	$ 243