Fair Value Measurements (Summary Of Changes In Level 3 Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2025	Mar. 31, 2024
Fair Value Assets Measured on Recurring Basis [Roll Forward]
Beginning balance		$ 185,350	$ 177,614
Total gains (losses) (realized/unrealized), included in earnings		(8,525)	7,100
Total gains (losses) (realized/unrealized), included in other comprehensive income	[1]	(18)	9
Discount accretion		1	0
Purchase of private equity securities		5,698	9,477
Sales And Repayments Of Private Equity Securities		(5,958)	(9,400)
Capitalized interest/dividends		17	(138)
Ending balance		176,565	184,662
Total gains (losses) for the annual period included in earnings attributable to the change in unrealized gains or losses relating to assets still held at period end		(8,525)	7,100
Gains (Losses) included in OCI Attributable to Change in Unrealized Gains (Losses) Relating to Assets Still Held, Total		$ (18)	9
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]		INVESTMENT SECURITIES GAINS (LOSSES), NET
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Asset, Gain (Loss), Statement of Other Comprehensive Income or Comprehensive Income [Extensible Enumeration]		Net unrealized gains (losses) on available for sale debt securities
State and municipal obligations [Member]
Fair Value Assets Measured on Recurring Basis [Roll Forward]
Beginning balance		$ 964	947
Total gains (losses) (realized/unrealized), included in earnings		0	0
Total gains (losses) (realized/unrealized), included in other comprehensive income	[1]	(18)	9
Discount accretion		1	0
Purchase of private equity securities		0	0
Sales And Repayments Of Private Equity Securities		0	0
Capitalized interest/dividends		0	0
Ending balance		947	956
Total gains (losses) for the annual period included in earnings attributable to the change in unrealized gains or losses relating to assets still held at period end		0	0
Gains (Losses) included in OCI Attributable to Change in Unrealized Gains (Losses) Relating to Assets Still Held, Total		(18)	9
Private Equity Investments [Member]
Fair Value Assets Measured on Recurring Basis [Roll Forward]
Beginning balance		184,386	176,667
Total gains (losses) (realized/unrealized), included in earnings		(8,525)	7,100
Total gains (losses) (realized/unrealized), included in other comprehensive income	[1]	0	0
Discount accretion		0	0
Purchase of private equity securities		5,698	9,477
Sales And Repayments Of Private Equity Securities		(5,958)	(9,400)
Capitalized interest/dividends		17	(138)
Ending balance		175,618	183,706
Total gains (losses) for the annual period included in earnings attributable to the change in unrealized gains or losses relating to assets still held at period end		(8,525)	7,100
Gains (Losses) included in OCI Attributable to Change in Unrealized Gains (Losses) Relating to Assets Still Held, Total		$ 0	$ 0

[1] * Included in "net unrealized gains (losses) on available for sale debt securities" in the consolidated statements of comprehensive income.