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, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Fair Value Assets Measured on Recurring Basis [Roll Forward]
Beginning balance		$ 164,305	$ 155,534	$ 179,883	$ 149,961
Total gains or losses (realized /unrealized), included in earnings		9,074	15,502	11,383	22,457
Total gains or losses (realized/unrealized), included in other comprehensive income	[1]	5	(87)	31	(170)
Investment Securities Called		0	0	(1,000)	0
Discount accretion		1	1	48	2
Purchase of private equity securities		224	822	10,756	1,122
Sale/pay down of private equity investments		0	(8,095)	(27,492)	(9,840)
Purchase Of Risk Participation Agreement		61	314	61	459
Sale Of Risk Participation Agreement		(13)	(250)	(13)	(250)
Ending balance		173,657	163,741	173,657	163,741
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		9,151	15,781	11,383	23,169
Gains (Losses) included in OCI Attributable to Change in Unrealized Gains (Losses) Relating to Assets Still Held, Total		5	(87)	10	(170)
State and municipal obligations [Member]
Fair Value Assets Measured on Recurring Basis [Roll Forward]
Beginning balance		914	1,902	1,841	1,984
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]	5	(87)	31	(170)
Investment Securities Called		0	0	(1,000)	0
Discount accretion		1	1	48	2
Purchase of private equity securities		0	0	0	0
Sale/pay down of private equity investments		0	0	0	0
Purchase Of Risk Participation Agreement		0	0	0	0
Sale Of Risk Participation Agreement		0	0	0	0
Ending balance		920	1,816	920	1,816
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		5	(87)	10	(170)
Private Equity Investments [Member]
Fair Value Assets Measured on Recurring Basis [Roll Forward]
Beginning balance		163,418	153,411	178,127	147,406
Total gains or losses (realized /unrealized), included in earnings		9,090	15,633	11,341	23,083
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		224	822	10,756	1,122
Sale/pay down of private equity investments		0	(8,095)	(27,492)	(9,840)
Purchase Of Risk Participation Agreement		0	0	0	0
Sale Of Risk Participation Agreement		0	0	0	0
Ending balance		172,732	161,771	172,732	161,771
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		9,090	15,633	11,341	23,033
Gains (Losses) included in OCI Attributable to Change in Unrealized Gains (Losses) Relating to Assets Still Held, Total		0	0	0	0
Derivatives [Member]
Fair Value Assets Measured on Recurring Basis [Roll Forward]
Beginning balance		(27)	221	(85)	571
Total gains or losses (realized /unrealized), included in earnings		(16)	(131)	42	(626)
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		0	0	0	0
Sale/pay down of private equity investments		0	0	0	0
Purchase Of Risk Participation Agreement		61	314	61	459
Sale Of Risk Participation Agreement		(13)	(250)	(13)	(250)
Ending balance		5	154	5	154
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		61	148	42	136
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.