Segment Information (Schedule Of Operating Results By Segment) (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) segments	Sep. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)
Segment Reporting Information [Line Items]
Number of Operating Segments | segments			2
Net interest income	$ 83,840	$ 77,101	$ 241,309	$ 220,728
Provision for (recovery of) loan losses	13,836	1,967	31,213	6,384
Other income and security gains	36,558	28,136	90,008	72,969
Total other expense	69,859	65,738	200,934	192,757
Income (loss) before income taxes	36,703	37,532	99,170	94,556
Income Tax Expense (Benefit)	5,857	6,386	16,447	15,792
Net Income	30,846	31,146	82,723	78,764
Assets	9,240,006	8,723,610	9,240,006	8,723,610	$ 8,558,377
PNB [Member]
Segment Reporting Information [Line Items]
Net interest income	83,795	76,180	238,900	217,355
Provision for (recovery of) loan losses	13,839	2,320	32,256	6,563
Other income and security gains	35,430	24,842	89,920	68,224
Total other expense	65,590	60,943	187,661	172,931
Income (loss) before income taxes	39,796	37,759	108,903	106,085
Income Tax Expense (Benefit)	6,908	6,811	19,357	19,063
Net Income	32,888	30,948	89,546	87,022
Assets	9,195,911	8,673,919	9,195,911	8,673,919
GFSC [Member]
Segment Reporting Information [Line Items]
Net interest income	893	1,244	3,070	3,786
Provision for (recovery of) loan losses	34	143	338	458
Other income and security gains	60	59	154	142
Total other expense	499	902	1,915	2,638
Income (loss) before income taxes	420	258	971	832
Income Tax Expense (Benefit)	88	55	204	179
Net Income	332	203	767	653
Assets	16,045	27,481	16,045	27,481
All Other [Member]
Segment Reporting Information [Line Items]
Net interest income	(848)	(323)	(661)	(413)
Provision for (recovery of) loan losses	(37)	(496)	(1,381)	(637)
Other income and security gains	1,068	3,235	(66)	4,603
Total other expense	3,770	3,893	11,358	17,188
Income (loss) before income taxes	(3,513)	(485)	(10,704)	(12,361)
Income Tax Expense (Benefit)	(1,139)	(480)	(3,114)	(3,450)
Net Income	(2,374)	(5)	(7,590)	(8,911)
Assets	$ 28,050	$ 22,210	$ 28,050	$ 22,210