Derivative Financial Instruments (Schedule Of Fair Value Of Derivative Financial Instruments) (Detail) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021	Jun. 30, 2021
Derivative [Line Items]
Derivative Assets	$ 183,925	$ 165,008	$ 212,380
Derivative Liabilities	167,857	123,000	193,439
Interest rate contract
Derivative [Line Items]
Derivative Assets	175,756	152,493	188,331
Derivative Liabilities	165,107	119,907	187,359
Designated as hedging instrument
Derivative [Line Items]
Derivative Assets	10,547	48,783	34,821
Derivative Liabilities	128	16,242	33,645
Designated as hedging instrument | Interest rate contract | Interest rate derivatives designated as Cash Flow Hedges
Derivative [Line Items]
Derivative Assets	151	47,309	34,743
Derivative Liabilities	0	10,401	24,272
Designated as hedging instrument | Interest rate contract | Interest rate derivatives designated as Fair Value Hedges
Derivative [Line Items]
Derivative Assets	10,396	1,474	78
Derivative Liabilities	128	5,841	9,373
Not designated as hedging instrument
Derivative [Line Items]
Derivative Assets	173,378	116,225	177,559
Derivative Liabilities	167,729	106,758	159,794
Not designated as hedging instrument | Interest rate contract
Derivative [Line Items]
Derivative Assets	165,209	103,710	153,510
Derivative Liabilities	164,979	103,665	153,714
Not designated as hedging instrument | Interest rate lock commitments
Derivative [Line Items]
Derivative Assets	6,649	10,560	23,175
Derivative Liabilities	173	885	2,834
Not designated as hedging instrument | Forward commitments to sell mortgage loans
Derivative [Line Items]
Derivative Assets	906	1,625	781
Derivative Liabilities	1,963	1,878	3,153
Not designated as hedging instrument | Foreign exchange contracts
Derivative [Line Items]
Derivative Assets	614	330	93
Derivative Liabilities	$ 614	$ 330	$ 93