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, 2024	Mar. 31, 2023
Fair Value Assets Measured on Recurring Basis [Roll Forward]
Beginning balance		$ 177,614	$ 179,968
Total gains or losses (realized /unrealized), included in earnings		7,100	2,251
Total gains or losses (realized/unrealized), included in other comprehensive income	[1]	9	26
Investment Securities Called		0	(1,000)
Discount accretion		0	47
Purchase of private equity securities		9,477	10,532
Sales And Repayments Of Private Equity Securities		(9,400)	(27,492)
Capitalized interest/dividends		(138)	0
Ending balance		184,662	164,332
Total gains or 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		7,100	2,251
Gains (Losses) included in OCI Attributable to Change in Unrealized Gains (Losses) Relating to Assets Still Held, Total		9	4
State and municipal obligations [Member]
Fair Value Assets Measured on Recurring Basis [Roll Forward]
Beginning balance		947	1,841
Total gains or losses (realized /unrealized), included in earnings		0	0
Total gains or losses (realized/unrealized), included in other comprehensive income	[1]	9	26
Investment Securities Called		0	(1,000)
Discount accretion		0	47
Purchase of private equity securities		0	0
Sales And Repayments Of Private Equity Securities		0	0
Capitalized interest/dividends		0	0
Ending balance		956	914
Total gains or 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		9	4
Private Equity Investments [Member]
Fair Value Assets Measured on Recurring Basis [Roll Forward]
Beginning balance		176,667	178,127
Total gains or losses (realized /unrealized), included in earnings		7,100	2,251
Total gains or losses (realized/unrealized), included in other comprehensive income	[1]	0	0
Investment Securities Called		0	0
Discount accretion		0	0
Purchase of private equity securities		9,477	10,532
Sales And Repayments Of Private Equity Securities		(9,400)	(27,492)
Capitalized interest/dividends		(138)	0
Ending balance		183,706	163,418
Total gains or 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		7,100	2,251
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.