Segment Information (Schedule Of Operating Results By Segment) (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($) segments	Sep. 30, 2015 USD ($)	Dec. 31, 2015 USD ($)
Segment Reporting Information [Line Items]
Number of Operating Segments | segments			3
Net interest income	$ 58,533,000	$ 57,715,000	$ 175,837,000	$ 169,765,000
Provision for (recovery of) loan losses	(7,366,000)	2,404,000	(3,819,000)	5,648,000
Other income and security gains	20,535,000	20,191,000	56,660,000	58,255,000
Total other expense	46,756,000	47,429,000	141,961,000	137,816,000
Income (loss) before income taxes	39,678,000	28,073,000	94,355,000	84,556,000
Income Tax Expense (Benefit)	12,229,000	8,033,000	28,222,000	24,433,000
Net Income	27,449,000	20,040,000	66,133,000	60,123,000
Assets	7,364,092,000	7,300,340,000	7,364,092,000	7,300,340,000	$ 7,311,354,000
PNB [Member]
Segment Reporting Information [Line Items]
Net interest income	57,033,000	55,972,000	170,194,000	164,559,000
Provision for (recovery of) loan losses	(3,345,000)	2,587,000	(450,000)	7,329,000
Other income and security gains	19,279,000	19,699,000	55,010,000	56,431,000
Total other expense	42,327,000	43,144,000	126,418,000	124,662,000
Income (loss) before income taxes	37,330,000	29,940,000	99,236,000	88,999,000
Income Tax Expense (Benefit)	11,839,000	9,233,000	30,923,000	27,800,000
Net Income	25,491,000	20,707,000	68,313,000	61,199,000
Assets	7,287,923,000	7,216,773,000	7,287,923,000	7,216,773,000
GFSC [Member]
Segment Reporting Information [Line Items]
Net interest income	1,472,000	1,643,000	4,416,000	5,014,000
Provision for (recovery of) loan losses	(313,000)	282,000	1,658,000	1,086,000
Other income and security gains	(1,000)	1,000	(1,000)	2,000
Total other expense	800,000	726,000	3,632,000	2,264,000
Income (loss) before income taxes	984,000	636,000	(875,000)	1,666,000
Income Tax Expense (Benefit)	344,000	242,000	(305,000)	584,000
Net Income	640,000	394,000	(570,000)	1,082,000
Assets	32,759,000	36,517,000	32,759,000	36,517,000
SEPH [Member]
Segment Reporting Information [Line Items]
Net interest income	8,000	65,000	1,240,000	(37,000)
Provision for (recovery of) loan losses	(3,708,000)	(465,000)	(5,027,000)	(2,767,000)
Other income and security gains	1,126,000	347,000	1,272,000	1,434,000
Total other expense	1,789,000	1,456,000	4,525,000	4,939,000
Income (loss) before income taxes	3,053,000	(579,000)	3,014,000	(775,000)
Income Tax Expense (Benefit)	1,070,000	(203,000)	1,056,000	(271,000)
Net Income	1,983,000	(376,000)	1,958,000	(504,000)
Assets	36,938,000	37,938,000	36,938,000	37,938,000
All Other [Member]
Segment Reporting Information [Line Items]
Net interest income	20,000	35,000	(13,000)	229,000
Other income and security gains	131,000	144,000	379,000	388,000
Total other expense	1,840,000	2,103,000	7,386,000	5,951,000
Income (loss) before income taxes	(1,689,000)	(1,924,000)	(7,020,000)	(5,334,000)
Income Tax Expense (Benefit)	(1,024,000)	(1,239,000)	(3,452,000)	(3,680,000)
Net Income	(665,000)	(685,000)	(3,568,000)	(1,654,000)
Assets	$ 6,472,000	$ 9,112,000	$ 6,472,000	$ 9,112,000