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, 2022	Mar. 31, 2021
Fair Value Assets Measured on Recurring Basis [Roll Forward]
Beginning balance		$ 149,961	$ 105,077
Total gains or losses (realized /unrealized), included in earnings		6,955	7,358
Total gains or losses (realized/unrealized), included in other comprehensive income	[1]	(83)	(1)
Discount accretion		1	3
Purchase of private equity securities		300	0
Sale/pay down of private equity investments		(1,745)	(8,476)
Purchase Of Risk Participation Agreement		145	0
Sale Of Risk Participation Agreement		0	(98)
Ending balance		155,534	103,863
Total gains or losses for the three months included in earnings attributable to the change in unrealized gains or losses relating to assets still held at March 31, 2022		7,717	10,415
*Total gains or losses for the three months included in other comprehensive income attributable to the change in unrealized gains or losses relating to assets still held at March 31, 2022		(83)	(1)
State and Municipal Obligations
Fair Value Assets Measured on Recurring Basis [Roll Forward]
Beginning balance		1,984	7,968
Total gains or losses (realized /unrealized), included in earnings		0	0
Total gains or losses (realized/unrealized), included in other comprehensive income	[1]	(83)	(1)
Discount accretion		1	3
Purchase of private equity securities		0	0
Sale/pay down of private equity investments		0	0
Purchase Of Risk Participation Agreement		0	0
Sale Of Risk Participation Agreement		0	0
Ending balance		1,902	7,970
Total gains or losses for the three months included in earnings attributable to the change in unrealized gains or losses relating to assets still held at March 31, 2022		0	0
*Total gains or losses for the three months included in other comprehensive income attributable to the change in unrealized gains or losses relating to assets still held at March 31, 2022		(83)	(1)
Private Equity Investments
Fair Value Assets Measured on Recurring Basis [Roll Forward]
Beginning balance		147,406	94,368
Total gains or losses (realized /unrealized), included in earnings		7,450	8,365
Total gains or losses (realized/unrealized), included in other comprehensive income	[1]	0	0
Discount accretion		0	0
Purchase of private equity securities		300	0
Sale/pay down of private equity investments		(1,745)	(8,476)
Purchase Of Risk Participation Agreement		0	0
Sale Of Risk Participation Agreement		0	0
Ending balance		153,411	94,257
Total gains or losses for the three months included in earnings attributable to the change in unrealized gains or losses relating to assets still held at March 31, 2022		7,450	8,365
*Total gains or losses for the three months included in other comprehensive income attributable to the change in unrealized gains or losses relating to assets still held at March 31, 2022		0	0
Derivatives
Fair Value Assets Measured on Recurring Basis [Roll Forward]
Beginning balance		571	2,741
Total gains or losses (realized /unrealized), included in earnings		(495)	(1,007)
Total gains or losses (realized/unrealized), included in other comprehensive income	[1]	0	0
Discount accretion		0	0
Purchase of private equity securities		0	0
Sale/pay down of private equity investments		0	0
Purchase Of Risk Participation Agreement		145	0
Sale Of Risk Participation Agreement		0	(98)
Ending balance		221	1,636
Total gains or losses for the three months included in earnings attributable to the change in unrealized gains or losses relating to assets still held at March 31, 2022		267	2,050
*Total gains or losses for the three months included in other comprehensive income attributable to the change in unrealized gains or losses relating to assets still held at March 31, 2022		$ 0	$ 0

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