Segment Information (Schedule Of Operating Results By Segment) (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($) segments	Jun. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)
Segment Reporting Information [Line Items]
Number of Operating Segments | segments			3
Net interest income	$ 64,742,000	$ 59,778,000	$ 129,592,000	$ 118,730,000
Provision for (recovery of) loan losses	1,386,000	4,581,000	1,646,000	5,457,000
Other income and security gains	23,242,000	20,699,000	50,145,000	39,654,000
Total other expense	52,534,000	49,554,000	106,842,000	98,464,000
Income (loss) before income taxes	34,064,000	26,342,000	71,249,000	54,463,000
Income Tax Expense (Benefit)	5,823,000	7,310,000	11,885,000	15,164,000
Net Income	28,241,000	19,032,000	59,364,000	39,299,000
Assets	7,462,156,000	7,832,092,000	7,462,156,000	7,832,092,000	$ 7,537,620,000
PNB [Member]
Segment Reporting Information [Line Items]
Net interest income	62,683,000	57,822,000	124,124,000	115,302,000
Provision for (recovery of) loan losses	1,623,000	4,574,000	1,556,000	5,294,000
Other income and security gains	22,070,000	20,582,000	41,985,000	39,696,000
Total other expense	48,169,000	45,280,000	97,170,000	90,486,000
Income (loss) before income taxes	34,961,000	28,550,000	67,383,000	59,218,000
Income Tax Expense (Benefit)	6,164,000	8,387,000	11,841,000	17,569,000
Net Income	28,797,000	20,163,000	55,542,000	41,649,000
Assets	7,404,498,000	7,754,898,000	7,404,498,000	7,754,898,000
GFSC [Member]
Segment Reporting Information [Line Items]
Net interest income	1,261,000	1,491,000	2,566,000	2,969,000
Provision for (recovery of) loan losses	87,000	373,000	590,000	810,000
Other income and security gains	42,000	8,000	72,000	24,000
Total other expense	842,000	841,000	1,602,000	1,593,000
Income (loss) before income taxes	374,000	285,000	446,000	590,000
Income Tax Expense (Benefit)	79,000	99,000	94,000	206,000
Net Income	295,000	186,000	352,000	384,000
Assets	29,232,000	33,860,000	29,232,000	33,860,000
SEPH [Member]
Segment Reporting Information [Line Items]
Net interest income	616,000	282,000	2,493,000	483,000
Provision for (recovery of) loan losses	(324,000)	(366,000)	(500,000)	(647,000)
Other income and security gains	71,000	8,000	3,658,000	37,000
Total other expense	857,000	1,267,000	2,882,000	2,072,000
Income (loss) before income taxes	154,000	(611,000)	3,769,000	(905,000)
Income Tax Expense (Benefit)	32,000	(213,000)	791,000	(316,000)
Net Income	122,000	(398,000)	2,978,000	(589,000)
Assets	7,786,000	24,595,000	7,786,000	24,595,000
All Other [Member]
Segment Reporting Information [Line Items]
Net interest income	182,000	183,000	409,000	(24,000)
Other income and security gains	1,059,000	101,000	4,430,000	(103,000)
Total other expense	2,666,000	2,166,000	5,188,000	4,313,000
Income (loss) before income taxes	(1,425,000)	(1,882,000)	(349,000)	(4,440,000)
Income Tax Expense (Benefit)	(452,000)	(963,000)	(841,000)	(2,295,000)
Net Income	(973,000)	(919,000)	492,000	(2,145,000)
Assets	$ 20,640,000	$ 18,739,000	$ 20,640,000	$ 18,739,000