Segment Information (Schedule Of Operating Results By Segment) (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($) segments	Jun. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)
Segment Reporting Information [Line Items]
Number of Operating Segments | segments			2
Net interest income	$ 81,186	$ 75,851	$ 157,469	$ 143,627
Provision for (recovery of) loan losses	12,224	1,919	17,377	4,417
Other income and security gains	30,964	22,808	53,450	44,833
Total other expense	64,799	70,192	131,075	127,019
Income (loss) before income taxes	35,127	26,548	62,467	57,024
Income Tax Expense (Benefit)	5,622	4,385	10,590	9,406
Net Income	29,505	22,163	51,877	47,618
Assets	9,712,994	8,657,453	9,712,994	8,657,453	$ 8,558,377
PNB [Member]
Segment Reporting Information [Line Items]
Net interest income	79,891	74,893	155,105	141,175
Provision for (recovery of) loan losses	12,883	1,803	18,417	4,243
Other income and security gains	31,009	22,674	54,490	43,382
Total other expense	60,703	60,014	122,071	111,988
Income (loss) before income taxes	37,314	35,750	69,107	68,326
Income Tax Expense (Benefit)	6,564	6,368	12,449	12,252
Net Income	30,750	29,382	56,658	56,074
Assets	9,665,657	8,607,583	9,665,657	8,607,583
GFSC [Member]
Segment Reporting Information [Line Items]
Net interest income	1,025	1,217	2,177	2,542
Provision for (recovery of) loan losses	27	170	304	315
Other income and security gains	62	51	94	83
Total other expense	651	891	1,416	1,736
Income (loss) before income taxes	409	207	551	574
Income Tax Expense (Benefit)	86	44	116	124
Net Income	323	163	435	450
Assets	20,125	29,222	20,125	29,222
All Other [Member]
Segment Reporting Information [Line Items]
Net interest income	270	(259)	187	(90)
Provision for (recovery of) loan losses	(686)	(54)	(1,344)	(141)
Other income and security gains	(107)	83	(1,134)	1,368
Total other expense	3,445	9,287	7,588	13,295
Income (loss) before income taxes	(2,596)	(9,409)	(7,191)	(11,876)
Income Tax Expense (Benefit)	(1,028)	(2,027)	(1,975)	(2,970)
Net Income	(1,568)	(7,382)	(5,216)	(8,906)
Assets	$ 27,212	$ 20,648	$ 27,212	$ 20,648