Segment Information (Schedule Of Operating Results By Segment) (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2022 USD ($) segments	Jun. 30, 2021 USD ($)	Dec. 31, 2021 USD ($)
Segment Reporting Information [Line Items]
Number of Operating Segments | segments			1
Net interest income	$ 83,939	$ 83,851	$ 161,625	$ 164,585
Recovery of credit losses	2,991	(4,040)	(1,614)	(8,895)
Other income and security gains	31,193	31,238	62,849	65,327
Total other expense	70,048	71,400	137,421	139,265
Income (loss) before income taxes	42,093	47,729	88,667	99,542
Income Tax Expense (Benefit)	7,769	8,597	15,468	17,579
Net Income	34,324	39,132	73,199	81,963
Assets	9,826,670	9,947,994	9,826,670	9,947,994	$ 9,560,254
PNB [Member]
Segment Reporting Information [Line Items]
Net interest income	83,411	82,675	162,783	164,761
Recovery of credit losses	3,357	(3,752)	(1,190)	(7,946)
Other income and security gains	29,255	31,126	60,502	63,926
Total other expense	66,214	67,122	130,430	130,698
Income (loss) before income taxes	43,095	50,431	94,045	105,935
Income Tax Expense (Benefit)	8,155	9,535	17,637	19,917
Net Income	34,940	40,896	76,408	86,018
Assets	9,794,711	9,922,623	9,794,711	9,922,623
All Other [Member]
Segment Reporting Information [Line Items]
Net interest income	528	1,176	(1,158)	(176)
Recovery of credit losses	(366)	(288)	(424)	(949)
Other income and security gains	1,938	112	2,347	1,401
Total other expense	3,834	4,278	6,991	8,567
Income (loss) before income taxes	(1,002)	(2,702)	(5,378)	(6,393)
Income Tax Expense (Benefit)	(386)	(938)	(2,169)	(2,338)
Net Income	(616)	(1,764)	(3,209)	(4,055)
Assets	$ 31,959	$ 25,371	$ 31,959	$ 25,371