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, 2026	Mar. 31, 2025
Fair Value Assets Measured on Recurring Basis [Roll Forward]
Beginning balance		$ 185,295	$ 185,350
Total gains (losses) (realized/unrealized), included in earnings		10,890	(8,525)
Total gains (losses) (realized/unrealized), included in other comprehensive income	[1]	(3)	(18)
Discount accretion		1	1
Purchase of private equity securities		5,601	5,698
Sales And Repayments Of Private Equity Securities		(17,088)	(5,958)
Capitalized interest/dividends		18	17
Ending balance		184,714	176,565
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		10,890	(8,525)
Gains (Losses) included in OCI Attributable to Change in Unrealized Gains (Losses) Relating to Assets Still Held, Total		$ (3)	$ (18)
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]		INVESTMENT SECURITIES GAINS (LOSSES), NET	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	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		$ 952	$ 964
Total gains (losses) (realized/unrealized), included in earnings		0	0
Total gains (losses) (realized/unrealized), included in other comprehensive income	[1]	(3)	(18)
Discount accretion		1	1
Purchase of private equity securities		0	0
Sales And Repayments Of Private Equity Securities		0	0
Capitalized interest/dividends		0	0
Ending balance		950	947
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		(3)	(18)
Private Equity Investments [Member]
Fair Value Assets Measured on Recurring Basis [Roll Forward]
Beginning balance		184,343	184,386
Total gains (losses) (realized/unrealized), included in earnings		10,890	(8,525)
Total gains (losses) (realized/unrealized), included in other comprehensive income	[1]	0	0
Discount accretion		0	0
Purchase of private equity securities		5,601	5,698
Sales And Repayments Of Private Equity Securities		(17,088)	(5,958)
Capitalized interest/dividends		18	17
Ending balance		183,764	175,618
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		10,890	(8,525)
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.