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		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Rollforward of AOCI from Cash Flow Hedging Derivatives [Roll Forward]
Unrealized gain (loss) at beginning of period	$ 78,764	$ 10,471	$ 36,908	$ (31,533)
Amount reclassified from accumulated other comprehensive income or loss to interest expense on deposits, other borrowings and junior subordinated debentures	(5,451)	6,780	914	20,342
Amount of (loss) income recognized in other comprehensive income	(70,990)	2,224	(35,499)	30,666
Unrealized gain at end of period	$ 2,323	$ 19,475	$ 2,323	$ 19,475