Segment Information (Schedule Of Operating Results By Segment) (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2017 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2017 USD ($) segments	Jun. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)
Segment Reporting Information [Line Items]
Number of Operating Segments | segments			3
Net interest income	$ 59,778,000	$ 57,485,000	$ 118,730,000	$ 117,304,000
Provision for (recovery of) loan losses	4,581,000	2,637,000	5,457,000	3,547,000
Other income and security gains	19,251,000	18,736,000	36,758,000	36,125,000
Total other expense	48,106,000	45,306,000	95,568,000	95,205,000
Income (loss) before income taxes	26,342,000	28,278,000	54,463,000	54,677,000
Income Tax Expense (Benefit)	7,310,000	8,280,000	15,164,000	15,993,000
Net Income	19,032,000	19,998,000	39,299,000	38,684,000
Assets	7,832,092,000	7,431,610,000	7,832,092,000	7,431,610,000	$ 7,467,586,000
PNB [Member]
Segment Reporting Information [Line Items]
Net interest income	57,822,000	56,006,000	115,302,000	113,161,000
Provision for (recovery of) loan losses	4,574,000	1,362,000	5,294,000	2,895,000
Other income and security gains	19,179,000	18,508,000	36,890,000	35,731,000
Total other expense	43,877,000	42,731,000	87,680,000	84,091,000
Income (loss) before income taxes	28,550,000	30,421,000	59,218,000	61,906,000
Income Tax Expense (Benefit)	8,387,000	9,343,000	17,569,000	19,084,000
Net Income	20,163,000	21,078,000	41,649,000	42,822,000
Assets	7,754,898,000	7,351,293,000	7,754,898,000	7,351,293,000
GFSC [Member]
Segment Reporting Information [Line Items]
Net interest income	1,491,000	1,440,000	2,969,000	2,944,000
Provision for (recovery of) loan losses	373,000	1,444,000	810,000	1,971,000
Other income and security gains	(8,000)		(8,000)
Total other expense	825,000	(966,000)	1,561,000	2,832,000
Income (loss) before income taxes	285,000	962,000	590,000	(1,859,000)
Income Tax Expense (Benefit)	99,000	336,000	206,000	(649,000)
Net Income	186,000	626,000	384,000	(1,210,000)
Assets	33,860,000	32,546,000	33,860,000	32,546,000
SEPH [Member]
Segment Reporting Information [Line Items]
Net interest income	282,000	71,000	483,000	1,232,000
Provision for (recovery of) loan losses	(366,000)	(169,000)	(647,000)	(1,319,000)
Other income and security gains	(21,000)	112,000	(21,000)	146,000
Total other expense	1,238,000	1,332,000	2,014,000	2,736,000
Income (loss) before income taxes	(611,000)	(980,000)	(905,000)	(39,000)
Income Tax Expense (Benefit)	(213,000)	(343,000)	(316,000)	(14,000)
Net Income	(398,000)	(637,000)	(589,000)	(25,000)
Assets	24,595,000	32,822,000	24,595,000	32,822,000
All Other [Member]
Segment Reporting Information [Line Items]
Net interest income	183,000	(32,000)	(24,000)	(33,000)
Other income and security gains	101,000	116,000	(103,000)	248,000
Total other expense	2,166,000	2,209,000	4,313,000	5,546,000
Income (loss) before income taxes	(1,882,000)	(2,125,000)	(4,440,000)	(5,331,000)
Income Tax Expense (Benefit)	(963,000)	(1,056,000)	(2,295,000)	(2,428,000)
Net Income	(919,000)	(1,069,000)	(2,145,000)	(2,903,000)
Assets	$ 18,739,000	$ 14,949,000	$ 18,739,000	$ 14,949,000