Segment Information (Schedule Of Operating Results By Segment) (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($) segments	Sep. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)
Segment Reporting Information [Line Items]
Number of Operating Segments | segments			2
Net interest income	$ 77,101,000	$ 67,676,000	$ 220,728,000	$ 197,268,000
Provision for (recovery of) loan losses	1,967,000	2,940,000	6,384,000	4,586,000
Other income and security gains	28,136,000	24,064,000	72,969,000	74,209,000
Total other expense	65,738,000	59,316,000	192,757,000	166,158,000
Income (loss) before income taxes	37,532,000	29,484,000	94,556,000	100,733,000
Income Tax Expense (Benefit)	6,386,000	4,722,000	15,792,000	16,607,000
Net Income	31,146,000	24,762,000	78,764,000	84,126,000
Assets	8,723,610,000	7,756,491,000	8,723,610,000	7,756,491,000	$ 7,804,308,000
PNB [Member]
Segment Reporting Information [Line Items]
Net interest income	76,180,000	66,195,000	217,355,000	190,319,000
Provision for (recovery of) loan losses	2,320,000	2,935,000	6,563,000	4,491,000
Other income and security gains	24,842,000	22,559,000	68,224,000	64,544,000
Total other expense	60,943,000	51,982,000	172,931,000	149,152,000
Income (loss) before income taxes	37,759,000	33,837,000	106,085,000	101,220,000
Income Tax Expense (Benefit)	6,811,000	5,981,000	19,063,000	17,822,000
Net Income	30,948,000	27,856,000	87,022,000	83,398,000
Assets	8,673,919,000	7,707,474,000	8,673,919,000	7,707,474,000
GFSC [Member]
Segment Reporting Information [Line Items]
Net interest income	1,244,000	1,252,000	3,786,000	3,818,000
Provision for (recovery of) loan losses	143,000	183,000	458,000	773,000
Other income and security gains	59,000	63,000	142,000	135,000
Total other expense	902,000	810,000	2,638,000	2,412,000
Income (loss) before income taxes	258,000	322,000	832,000	768,000
Income Tax Expense (Benefit)	55,000	68,000	179,000	162,000
Net Income	203,000	254,000	653,000	606,000
Assets	27,481,000	28,551,000	27,481,000	28,551,000
All Other [Member]
Segment Reporting Information [Line Items]
Net interest income	(323,000)	229,000	(413,000)	3,131,000
Provision for (recovery of) loan losses	(496,000)	(178,000)	(637,000)	(678,000)
Other income and security gains	3,235,000	1,442,000	4,603,000	9,530,000
Total other expense	3,893,000	6,524,000	17,188,000	14,594,000
Income (loss) before income taxes	(485,000)	(4,675,000)	(12,361,000)	(1,255,000)
Income Tax Expense (Benefit)	(480,000)	(1,327,000)	(3,450,000)	(1,377,000)
Net Income	(5,000)	(3,348,000)	(8,911,000)	122,000
Assets	$ 22,210,000	$ 20,466,000	$ 22,210,000	$ 20,466,000