Segment Information (Schedule Of Operating Results By Segment) (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($) segments	Sep. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)
Segment Reporting Information [Line Items]
Number of Operating Segments | segments			3
Net interest income	$ 67,676,000	$ 61,551,000	$ 197,268,000	$ 180,281,000
Provision for (recovery of) loan losses	2,940,000	3,283,000	4,586,000	8,740,000
Other income and security gains	24,064,000	23,537,000	74,209,000	63,191,000
Total other expense	59,316,000	51,259,000	166,158,000	149,723,000
Income (loss) before income taxes	29,484,000	30,546,000	100,733,000	85,009,000
Income Tax Expense (Benefit)	4,722,000	8,434,000	16,607,000	23,598,000
Net Income	24,762,000	22,112,000	84,126,000	61,411,000
Assets	7,756,491,000	7,862,695,000	7,756,491,000	7,862,695,000	$ 7,537,620,000
PNB [Member]
Segment Reporting Information [Line Items]
Net interest income	66,195,000	59,415,000	190,319,000	174,717,000
Provision for (recovery of) loan losses	2,935,000	3,820,000	4,491,000	9,114,000
Other income and security gains	22,559,000	21,770,000	64,544,000	61,466,000
Total other expense	51,982,000	47,390,000	149,152,000	137,876,000
Income (loss) before income taxes	33,837,000	29,975,000	101,220,000	89,193,000
Income Tax Expense (Benefit)	5,981,000	8,678,000	17,822,000	26,247,000
Net Income	27,856,000	21,297,000	83,398,000	62,946,000
Assets	7,707,474,000	7,788,248,000	7,707,474,000	7,788,248,000
GFSC [Member]
Segment Reporting Information [Line Items]
Net interest income	1,252,000	1,455,000	3,818,000	4,424,000
Provision for (recovery of) loan losses	183,000	609,000	773,000	1,419,000
Other income and security gains	63,000	34,000	135,000	58,000
Total other expense	810,000	750,000	2,412,000	2,343,000
Income (loss) before income taxes	322,000	130,000	768,000	720,000
Income Tax Expense (Benefit)	68,000	46,000	162,000	252,000
Net Income	254,000	84,000	606,000	468,000
Assets	28,551,000	33,260,000	28,551,000	33,260,000
SEPH [Member]
Segment Reporting Information [Line Items]
Net interest income	119,000	401,000	2,612,000	884,000
Provision for (recovery of) loan losses	(178,000)	(1,146,000)	(678,000)	(1,793,000)
Other income and security gains	(99,000)	440,000	3,559,000	477,000
Total other expense	563,000	1,025,000	3,445,000	3,097,000
Income (loss) before income taxes	(365,000)	962,000	3,404,000	57,000
Income Tax Expense (Benefit)	(76,000)	336,000	715,000	20,000
Net Income	(289,000)	626,000	2,689,000	37,000
Assets	7,475,000	25,377,000	7,475,000	25,377,000
All Other [Member]
Segment Reporting Information [Line Items]
Net interest income	110,000	280,000	519,000	256,000
Other income and security gains	1,541,000	1,293,000	5,971,000	1,190,000
Total other expense	5,961,000	2,094,000	11,149,000	6,407,000
Income (loss) before income taxes	(4,310,000)	(521,000)	(4,659,000)	(4,961,000)
Income Tax Expense (Benefit)	(1,251,000)	(626,000)	(2,092,000)	(2,921,000)
Net Income	(3,059,000)	105,000	(2,567,000)	(2,040,000)
Assets	$ 12,991,000	$ 15,810,000	$ 12,991,000	$ 15,810,000