Derivative Financial Instruments (Schedule Of Fair Value Of Derivative Financial Instruments) (Detail) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022	Jun. 30, 2022
Derivative [Line Items]
Derivative Assets	$ 294,748	$ 296,848	$ 183,925
Derivative Liabilities	391,172	338,078	167,857
Interest rate derivatives
Derivative [Line Items]
Derivative Assets	279,614	286,438	175,756
Derivative Liabilities	382,413	329,307	165,107
Designated as hedging instrument
Derivative [Line Items]
Derivative Assets	18,409	16,768	10,547
Derivative Liabilities	121,347	58,198	128
Designated as hedging instrument | Interest rate derivatives | Interest rate derivatives designated as Cash Flow Hedges
Derivative [Line Items]
Derivative Assets	2,154	0	151
Derivative Liabilities	121,347	58,198	0
Designated as hedging instrument | Interest rate derivatives | Interest rate derivatives designated as Fair Value Hedges
Derivative [Line Items]
Derivative Assets	16,255	16,768	10,396
Derivative Liabilities	0	0	128
Not designated as hedging instrument
Derivative [Line Items]
Derivative Assets	276,339	280,080	173,378
Derivative Liabilities	269,825	279,880	167,729
Not designated as hedging instrument | Interest rate derivatives
Derivative [Line Items]
Derivative Assets	261,205	269,670	165,209
Derivative Liabilities	261,066	271,109	164,979
Not designated as hedging instrument | Interest rate lock commitments
Derivative [Line Items]
Derivative Assets	3,487	1,711	6,649
Derivative Liabilities	172	58	173
Not designated as hedging instrument | Forward commitments to sell mortgage loans
Derivative [Line Items]
Derivative Assets	2,769	220	906
Derivative Liabilities	38	414	1,963
Not designated as hedging instrument | Commodity forward contracts
Derivative [Line Items]
Derivative Assets	434	257	0
Derivative Liabilities	214	162	0
Not designated as hedging instrument | Foreign exchange contracts
Derivative [Line Items]
Derivative Assets	8,444	8,222	614
Derivative Liabilities	$ 8,335	$ 8,137	$ 614