Derivative Financial Instruments (Rollforward Of Amounts In Accumulated Other Comprehensive Income Related To Interest Rate Swaps Designated As Cash Flow Hedges) (Detail) - Interest rate contract - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Rollforward of AOCI from Cash Flow Hedging Derivatives [Roll Forward]
Unrealized gain (loss) at beginning of period	$ 76,389	$ 19,259	$ 36,908	$ (31,533)
Amount reclassified from accumulated other comprehensive income to interest expense on deposits, other borrowings and junior subordinated debentures	1,012	6,866	6,365	13,562
Amount of income recognized in other comprehensive income	1,363	(15,654)	35,491	28,442
Unrealized gain at end of period	$ 78,764	$ 10,471	$ 78,764	$ 10,471