Segment Information (Schedule Of Operating Results By Segment) (Details)	3 Months Ended
	Mar. 31, 2018 USD ($) segments	Mar. 31, 2017 USD ($)	Dec. 31, 2017 USD ($)
Segment Reporting Information [Line Items]
Number of Operating Segments | segments	3
Net interest income	$ 64,850,000	$ 58,952,000
Provision for (recovery of) loan losses	260,000	876,000
Other income and security gains	26,903,000	18,955,000
Total other expense	54,308,000	48,910,000
Income (loss) before income taxes	37,185,000	28,121,000
Income Tax Expense (Benefit)	6,062,000	7,854,000
Net Income	31,123,000	20,267,000
Assets	7,518,970,000	7,744,690,000	$ 7,537,620,000
PNB [Member]
Segment Reporting Information [Line Items]
Net interest income	61,441,000	57,480,000
Provision for (recovery of) loan losses	(67,000)	720,000
Other income and security gains	19,915,000	19,114,000
Total other expense	49,001,000	45,206,000
Income (loss) before income taxes	32,422,000	30,668,000
Income Tax Expense (Benefit)	5,677,000	9,182,000
Net Income	26,745,000	21,486,000
Assets	7,455,518,000	7,667,288,000
GFSC [Member]
Segment Reporting Information [Line Items]
Net interest income	1,305,000	1,478,000
Provision for (recovery of) loan losses	503,000	437,000
Other income and security gains	30,000	16,000
Total other expense	760,000	752,000
Income (loss) before income taxes	72,000	305,000
Income Tax Expense (Benefit)	15,000	107,000
Net Income	57,000	198,000
Assets	30,553,000	34,574,000
SEPH [Member]
Segment Reporting Information [Line Items]
Net interest income	1,877,000	201,000
Provision for (recovery of) loan losses	(176,000)	(281,000)
Other income and security gains	3,587,000	29,000
Total other expense	2,025,000	805,000
Income (loss) before income taxes	3,615,000	(294,000)
Income Tax Expense (Benefit)	759,000	(103,000)
Net Income	2,856,000	(191,000)
Assets	27,726,000	24,727,000
All Other [Member]
Segment Reporting Information [Line Items]
Net interest income	227,000	(207,000)
Other income and security gains	3,371,000	(204,000)
Total other expense	2,522,000	2,147,000
Income (loss) before income taxes	1,076,000	(2,558,000)
Income Tax Expense (Benefit)	(389,000)	(1,332,000)
Net Income	1,465,000	(1,226,000)
Assets	$ 5,173,000	$ 18,101,000