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		9 Months Ended
		Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Fair Value Assets Measured on Recurring Basis [Roll Forward]
Beginning balance		$ 175,020	$ 179,274	$ 185,350	$ 177,614
Total gains (losses) (realized/unrealized), included in earnings		7,953	7,428	3,842	20,205
Total gains (losses) (realized/unrealized), included in other comprehensive income	[1]	10	(2)	(6)	3
Discount accretion		0	0	2	1
Purchase of private equity securities		560	375	6,986	11,322
Sales And Repayments Of Private Equity Securities		(1,096)	(15,139)	(13,761)	(37,103)
Capitalized interest/dividends		18	(12)	52	(118)
Ending balance		182,465	171,924	182,465	171,924
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		7,953	7,428	4,641	10,480
Gains (Losses) included in OCI Attributable to Change in Unrealized Gains (Losses) Relating to Assets Still Held, Total		10	(2)	$ (6)	$ 3
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		950	953	$ 964	$ 947
Total gains (losses) (realized/unrealized), included in earnings		0	0	0	0
Total gains (losses) (realized/unrealized), included in other comprehensive income	[1]	10	(2)	(6)	3
Discount accretion		0	0	2	1
Purchase of private equity securities		0	0	0	0
Sales And Repayments Of Private Equity Securities		0	0	0	0
Capitalized interest/dividends		0	0	0	0
Ending balance		960	951	960	951
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	0	0
Gains (Losses) included in OCI Attributable to Change in Unrealized Gains (Losses) Relating to Assets Still Held, Total		10	(2)	(6)	3
Private Equity Investments [Member]
Fair Value Assets Measured on Recurring Basis [Roll Forward]
Beginning balance		174,070	178,321	184,386	176,667
Total gains (losses) (realized/unrealized), included in earnings		7,953	7,428	3,842	20,205
Total gains (losses) (realized/unrealized), included in other comprehensive income	[1]	0	0	0	0
Discount accretion		0	0	0	0
Purchase of private equity securities		560	375	6,986	11,322
Sales And Repayments Of Private Equity Securities		(1,096)	(15,139)	(13,761)	(37,103)
Capitalized interest/dividends		18	(12)	52	(118)
Ending balance		181,505	170,973	181,505	170,973
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		7,953	7,428	4,641	10,480
Gains (Losses) included in OCI Attributable to Change in Unrealized Gains (Losses) Relating to Assets Still Held, Total		$ 0	$ 0	$ 0	$ 0

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