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, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Fair Value Assets Measured on Recurring Basis [Roll Forward]
Beginning balance		$ 163,741	$ 125,866	$ 149,961	$ 105,077
Total gains or losses (realized /unrealized), included in earnings		13,942	12,709	36,399	36,313
Total gains or losses (realized/unrealized), included in other comprehensive income	[1]	40	(175)	(130)	(158)
Investment Securities Called		0	(6,000)	0	(6,000)
Discount accretion		2	179	4	185
Purchase of private equity securities		899	8,835	2,021	14,491
Sale/pay down of private equity investments		(423)	0	(10,263)	(8,832)
Capitalized interest/dividends		44	0	44	23
Purchase Of Risk Participation Agreement		0	0	459	445
Sale Of Risk Participation Agreement		(104)	(27)	(354)	(157)
Ending balance		178,141	141,387	178,141	141,387
Total gains or losses for the nine months included in earnings attributable to the change in unrealized gains or losses relating to assets still held at September 30, 2022		14,172	14,528	37,111	39,369
*Total gains or losses for the nine months included in other comprehensive income attributable to the change in unrealized gains or losses relating to assets still held at September 30, 2022		40	2	(130)	23
State and Municipal Obligations
Fair Value Assets Measured on Recurring Basis [Roll Forward]
Beginning balance		1,816	7,991	1,984	7,968
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]	40	(175)	(130)	(158)
Investment Securities Called		0	(6,000)	0	(6,000)
Discount accretion		2	179	4	185
Purchase of private equity securities		0	0	0	0
Sale/pay down of private equity investments		0	0	0	0
Capitalized interest/dividends		0	0	0	0
Purchase Of Risk Participation Agreement		0	0	0	0
Sale Of Risk Participation Agreement		0	0	0	0
Ending balance		1,858	1,995	1,858	1,995
Total gains or losses for the nine months included in earnings attributable to the change in unrealized gains or losses relating to assets still held at September 30, 2022		0	0	0	0
*Total gains or losses for the nine months included in other comprehensive income attributable to the change in unrealized gains or losses relating to assets still held at September 30, 2022		40	2	(130)	23
Private Equity Investments
Fair Value Assets Measured on Recurring Basis [Roll Forward]
Beginning balance		161,771	116,246	147,406	94,368
Total gains or losses (realized /unrealized), included in earnings		14,050	12,971	37,133	38,002
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		899	8,835	2,021	14,491
Sale/pay down of private equity investments		(423)	0	(10,263)	(8,832)
Capitalized interest/dividends		44	0	44	23
Purchase Of Risk Participation Agreement		0	0	0	0
Sale Of Risk Participation Agreement		0	0	0	0
Ending balance		176,341	138,052	176,341	138,052
Total gains or losses for the nine months included in earnings attributable to the change in unrealized gains or losses relating to assets still held at September 30, 2022		14,050	12,971	37,083	38,002
*Total gains or losses for the nine months included in other comprehensive income attributable to the change in unrealized gains or losses relating to assets still held at September 30, 2022		0	0	0	0
Derivatives
Fair Value Assets Measured on Recurring Basis [Roll Forward]
Beginning balance		154	1,629	571	2,741
Total gains or losses (realized /unrealized), included in earnings		(108)	(262)	(734)	(1,689)
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
Capitalized interest/dividends		0	0	0	0
Purchase Of Risk Participation Agreement		0	0	459	445
Sale Of Risk Participation Agreement		(104)	(27)	(354)	(157)
Ending balance		(58)	1,340	(58)	1,340
Total gains or losses for the nine months included in earnings attributable to the change in unrealized gains or losses relating to assets still held at September 30, 2022		122	1,557	28	1,367
*Total gains or losses for the nine months included in other comprehensive income attributable to the change in unrealized gains or losses relating to assets still held at September 30, 2022		$ 0	$ 0	$ 0	$ 0

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