Segment Information (Schedule Of Operating Results By Segment) (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($) segments	Jun. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)
Segment Reporting Information [Line Items]
Number of Operating Segments | segments			1
Net interest income	$ 83,851	$ 81,186	$ 164,585	$ 157,469
(Recovery of) provision for credit losses	(4,040)	12,224	(8,895)	17,377
Other income and security gains	31,238	30,964	65,327	53,450
Total other expense	71,400	64,799	139,265	131,075
Income (loss) before income taxes	47,729	35,127	99,542	62,467
Income Tax Expense (Benefit)	8,597	5,622	17,579	10,590
Net Income	39,132	29,505	81,963	51,877
Assets	9,947,994	9,712,994	9,947,994	9,712,994	$ 9,279,021
PNB [Member]
Segment Reporting Information [Line Items]
Net interest income	82,675	79,891	164,761	155,105
(Recovery of) provision for credit losses	(3,752)	12,883	(7,946)	18,417
Other income and security gains	31,126	31,009	63,926	54,490
Total other expense	67,122	60,703	130,698	122,071
Income (loss) before income taxes	50,431	37,314	105,935	69,107
Income Tax Expense (Benefit)	9,535	6,564	19,917	12,449
Net Income	40,896	30,750	86,018	56,658
Assets	9,922,623	9,665,657	9,922,623	9,665,657
All Other [Member]
Segment Reporting Information [Line Items]
Net interest income	1,176	1,295	(176)	2,364
(Recovery of) provision for credit losses	(288)	(659)	(949)	(1,040)
Other income and security gains	112	(45)	1,401	(1,040)
Total other expense	4,278	4,096	8,567	9,004
Income (loss) before income taxes	(2,702)	(2,187)	(6,393)	(6,640)
Income Tax Expense (Benefit)	(938)	(942)	(2,338)	(1,859)
Net Income	(1,764)	(1,245)	(4,055)	(4,781)
Assets	$ 25,371	$ 47,337	$ 25,371	$ 47,337