Segment Information (Schedule Of Operating Results By Segment) (Details)	3 Months Ended
	Mar. 31, 2019 USD ($) segments	Mar. 31, 2018 USD ($)	Dec. 31, 2018 USD ($)
Segment Reporting Information [Line Items]
Number of Operating Segments | segments	2
Net interest income	$ 67,776,000	$ 64,850,000
Provision for (recovery of) loan losses	2,498,000	260,000
Other income and security gains	22,025,000	26,903,000
Total other expense	56,827,000	54,308,000
Income (loss) before income taxes	30,476,000	37,185,000
Income Tax Expense (Benefit)	5,021,000	6,062,000
Net Income	25,455,000	31,123,000
Assets	7,852,246,000	7,518,970,000	$ 7,804,308,000
PNB [Member]
Segment Reporting Information [Line Items]
Net interest income	66,282,000	61,441,000
Provision for (recovery of) loan losses	2,440,000	(67,000)
Other income and security gains	20,708,000	19,915,000
Total other expense	51,974,000	49,001,000
Income (loss) before income taxes	32,576,000	32,422,000
Income Tax Expense (Benefit)	5,884,000	5,677,000
Net Income	26,692,000	26,745,000
Assets	7,801,148,000	7,455,518,000
GFSC [Member]
Segment Reporting Information [Line Items]
Net interest income	1,325,000	1,305,000
Provision for (recovery of) loan losses	145,000	503,000
Other income and security gains	32,000	30,000
Total other expense	845,000	760,000
Income (loss) before income taxes	367,000	72,000
Income Tax Expense (Benefit)	80,000	15,000
Net Income	287,000	57,000
Assets	30,238,000	30,553,000
All Other [Member]
Segment Reporting Information [Line Items]
Net interest income	169,000	2,104,000
Provision for (recovery of) loan losses	(87,000)	(176,000)
Other income and security gains	1,285,000	6,958,000
Total other expense	4,008,000	4,547,000
Income (loss) before income taxes	(2,467,000)	4,691,000
Income Tax Expense (Benefit)	(943,000)	370,000
Net Income	(1,524,000)	4,321,000
Assets	$ 20,860,000	$ 32,899,000