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		6 Months Ended
		Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Fair Value Assets Measured on Recurring Basis [Roll Forward]
Beginning balance		$ 184,662	$ 164,332	$ 177,614	$ 179,968
Total gains or losses (realized /unrealized), included in earnings		5,677	9,090	12,777	11,341
Total gains or losses (realized/unrealized), included in other comprehensive income	[1]	(4)	5	5	31
Investment Securities Called		0	0	0	(1,000)
Discount accretion		1	1	1	48
Purchase of private equity securities		1,470	224	10,947	10,756
Sales And Repayments Of Private Equity Securities		(12,564)	0	(21,964)	(27,492)
Capitalized interest/dividends		32		(106)	0
Ending balance		179,274	173,652	179,274	173,652
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		5,677	9,090	11,002	11,341
Gains (Losses) included in OCI Attributable to Change in Unrealized Gains (Losses) Relating to Assets Still Held, Total		(4)	5	5	10
State and municipal obligations [Member]
Fair Value Assets Measured on Recurring Basis [Roll Forward]
Beginning balance		956	914	947	1,841
Total gains or losses (realized /unrealized), included in earnings		0	0	0	0
Total gains or losses (realized/unrealized), included in other comprehensive income	[1]	(4)	5	5	31
Investment Securities Called		0	0	0	(1,000)
Discount accretion		1	1	1	48
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
Ending balance		953	920	953	920
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	0	0
Gains (Losses) included in OCI Attributable to Change in Unrealized Gains (Losses) Relating to Assets Still Held, Total		(4)	5	5	10
Private Equity Investments [Member]
Fair Value Assets Measured on Recurring Basis [Roll Forward]
Beginning balance		183,706	163,418	176,667	178,127
Total gains or losses (realized /unrealized), included in earnings		5,677	9,090	12,777	11,341
Total gains or losses (realized/unrealized), included in other comprehensive income	[1]	0	0	0	0
Investment Securities Called		0	0	0	0
Discount accretion		0	0	0	0
Purchase of private equity securities		1,470	224	10,947	10,756
Sales And Repayments Of Private Equity Securities		(12,564)	0	21,964	(27,492)
Capitalized interest/dividends		32		(106)	0
Ending balance		178,321	172,732	178,321	172,732
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		5,677	9,090	11,002	11,341
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.