Derivative Financial Instruments (Schedule Of Fair Value Of Derivative Financial Instruments) (Detail) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022
Derivative [Line Items]
Derivative Assets	$ 274,004	$ 296,848	$ 153,534
Derivative Liabilities	274,432	338,078	122,107
Interest rate derivatives
Derivative [Line Items]
Derivative Assets	259,331	286,438	139,701
Derivative Liabilities	262,465	329,307	120,079
Designated as hedging instrument
Derivative [Line Items]
Derivative Assets	39,462	16,768	20,645
Derivative Liabilities	43,412	58,198	5,077
Designated as hedging instrument | Interest rate derivatives | Interest rate derivatives designated as Cash Flow Hedges
Derivative [Line Items]
Derivative Assets	25,730	0	13,257
Derivative Liabilities	43,412	58,198	3,361
Designated as hedging instrument | Interest rate derivatives | Interest rate derivatives designated as Fair Value Hedges
Derivative [Line Items]
Derivative Assets	13,732	16,768	7,388
Derivative Liabilities	0	0	1,716
Not designated as hedging instrument
Derivative [Line Items]
Derivative Assets	234,542	280,080	132,889
Derivative Liabilities	231,020	279,880	117,030
Not designated as hedging instrument | Interest rate derivatives
Derivative [Line Items]
Derivative Assets	219,869	269,670	119,056
Derivative Liabilities	219,053	271,109	115,002
Not designated as hedging instrument | Interest rate lock commitments
Derivative [Line Items]
Derivative Assets	5,356	1,711	3,447
Derivative Liabilities	67	58	1,558
Not designated as hedging instrument | Forward commitments to sell mortgage loans
Derivative [Line Items]
Derivative Assets	121	220	10,063
Derivative Liabilities	2,953	414	147
Not designated as hedging instrument | Commodity forward contracts
Derivative [Line Items]
Derivative Assets	491	257	0
Derivative Liabilities	315	162	0
Not designated as hedging instrument | Foreign exchange contracts
Derivative [Line Items]
Derivative Assets	8,705	8,222	323
Derivative Liabilities	$ 8,632	$ 8,137	$ 323