Segment Information (Schedule Of Operating Results By Segment) (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($) segments	Sep. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)
Segment Reporting Information [Line Items]
Number of Operating Segments | segments			3
Net interest income	$ 61,551,000	$ 58,533,000	$ 180,281,000	$ 175,837,000
Provision for (recovery of) loan losses	3,283,000	(7,366,000)	8,740,000	(3,819,000)
Other income and security gains	22,089,000	20,535,000	58,847,000	56,660,000
Total other expense	49,811,000	46,756,000	145,379,000	141,961,000
Income (loss) before income taxes	30,546,000	39,678,000	85,009,000	94,355,000
Income Tax Expense (Benefit)	8,434,000	12,229,000	23,598,000	28,222,000
Net Income	22,112,000	27,449,000	61,411,000	66,133,000
Assets	7,862,695,000	7,364,092,000	7,862,695,000	7,364,092,000	$ 7,467,586,000
PNB [Member]
Segment Reporting Information [Line Items]
Net interest income	59,415,000	57,033,000	174,717,000	170,194,000
Provision for (recovery of) loan losses	3,820,000	(3,345,000)	9,114,000	(450,000)
Other income and security gains	20,367,000	19,279,000	57,257,000	55,010,000
Total other expense	45,987,000	42,327,000	133,667,000	126,418,000
Income (loss) before income taxes	29,975,000	37,330,000	89,193,000	99,236,000
Income Tax Expense (Benefit)	8,678,000	11,839,000	26,247,000	30,923,000
Net Income	21,297,000	25,491,000	62,946,000	68,313,000
Assets	7,788,248,000	7,287,923,000	7,788,248,000	7,287,923,000
GFSC [Member]
Segment Reporting Information [Line Items]
Net interest income	1,455,000	1,472,000	4,424,000	4,416,000
Provision for (recovery of) loan losses	609,000	(313,000)	1,419,000	1,658,000
Other income and security gains	18,000	(1,000)	10,000	(1,000)
Total other expense	734,000	800,000	2,295,000	3,632,000
Income (loss) before income taxes	130,000	984,000	720,000	(875,000)
Income Tax Expense (Benefit)	46,000	344,000	252,000	(305,000)
Net Income	84,000	640,000	468,000	(570,000)
Assets	33,260,000	32,759,000	33,260,000	32,759,000
SEPH [Member]
Segment Reporting Information [Line Items]
Net interest income	401,000	8,000	884,000	1,240,000
Provision for (recovery of) loan losses	(1,146,000)	(3,708,000)	(1,793,000)	(5,027,000)
Other income and security gains	411,000	1,126,000	390,000	1,272,000
Total other expense	996,000	1,789,000	3,010,000	4,525,000
Income (loss) before income taxes	962,000	3,053,000	57,000	3,014,000
Income Tax Expense (Benefit)	336,000	1,070,000	20,000	1,056,000
Net Income	626,000	1,983,000	37,000	1,958,000
Assets	25,377,000	36,938,000	25,377,000	36,938,000
All Other [Member]
Segment Reporting Information [Line Items]
Net interest income	280,000	20,000	256,000	(13,000)
Other income and security gains	1,293,000	131,000	1,190,000	379,000
Total other expense	2,094,000	1,840,000	6,407,000	7,386,000
Income (loss) before income taxes	(521,000)	(1,689,000)	(4,961,000)	(7,020,000)
Income Tax Expense (Benefit)	(626,000)	(1,024,000)	(2,921,000)	(3,452,000)
Net Income	105,000	(665,000)	(2,040,000)	(3,568,000)
Assets	$ 15,810,000	$ 6,472,000	$ 15,810,000	$ 6,472,000