Derivative Financial Instruments (Schedule of Notional Amounts and Estimated Fair Values of Interest Rate Derivative Contracts Outstanding) (Detail) - Not Designated as Hedging Instrument [Member] - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Financial Institution Counterparties Loan Lease Interest Rate Swaps Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Notional Amount	$ 783,022	$ 1,213,519
Estimated Fair Value	34,835	63,001
Financial Institution Counterparties Loan Lease Interest Rate Swaps Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Notional Amount	1,341,227	663,078
Estimated Fair Value	(20,598)	(9,068)
Financial Institution Counterparties Loan Lease Interest Rate Caps Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Notional Amount	251,075	205,164
Estimated Fair Value	3,230	7,053
Customer Counterparties Loan Lease Interest Rate Swaps Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Notional Amount	1,341,227	663,078
Estimated Fair Value	20,598	9,068
Customer Counterparties Loan Lease Interest Rate Swaps Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Notional Amount	783,022	1,213,519
Estimated Fair Value	(34,835)	(63,000)
Customer Counterparties Loan Lease Interest Rate Caps Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability, Notional Amount	251,075	205,164
Estimated Fair Value	$ (3,232)	$ (7,054)