Segment Information (Schedule Of Operating Results By Segment) (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($) segments	Jun. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)
Segment Reporting Information [Line Items]
Number of Operating Segments | segments			2
Net interest income	$ 75,851,000	$ 64,742,000	$ 143,627,000	$ 129,592,000
Provision for (recovery of) loan losses	1,919,000	1,386,000	4,417,000	1,646,000
Other income and security gains	22,808,000	23,242,000	44,833,000	50,145,000
Total other expense	70,192,000	52,534,000	127,019,000	106,842,000
Income (loss) before income taxes	26,548,000	34,064,000	57,024,000	71,249,000
Income Tax Expense (Benefit)	4,385,000	5,823,000	9,406,000	11,885,000
Net Income	22,163,000	28,241,000	47,618,000	59,364,000
Assets	8,657,453,000	7,462,156,000	8,657,453,000	7,462,156,000	$ 7,804,308,000
PNB [Member]
Segment Reporting Information [Line Items]
Net interest income	74,893,000	62,683,000	141,175,000	124,124,000
Provision for (recovery of) loan losses	1,803,000	1,623,000	4,243,000	1,556,000
Other income and security gains	22,674,000	22,070,000	43,382,000	41,985,000
Total other expense	60,014,000	48,169,000	111,988,000	97,170,000
Income (loss) before income taxes	35,750,000	34,961,000	68,326,000	67,383,000
Income Tax Expense (Benefit)	6,368,000	6,164,000	12,252,000	11,841,000
Net Income	29,382,000	28,797,000	56,074,000	55,542,000
Assets	8,607,583,000	7,404,498,000	8,607,583,000	7,404,498,000
GFSC [Member]
Segment Reporting Information [Line Items]
Net interest income	1,217,000	1,261,000	2,542,000	2,566,000
Provision for (recovery of) loan losses	170,000	87,000	315,000	590,000
Other income and security gains	51,000	42,000	83,000	72,000
Total other expense	891,000	842,000	1,736,000	1,602,000
Income (loss) before income taxes	207,000	374,000	574,000	446,000
Income Tax Expense (Benefit)	44,000	79,000	124,000	94,000
Net Income	163,000	295,000	450,000	352,000
Assets	29,222,000	29,232,000	29,222,000	29,232,000
All Other [Member]
Segment Reporting Information [Line Items]
Net interest income	(259,000)	798,000	(90,000)	2,902,000
Provision for (recovery of) loan losses	(54,000)	(324,000)	(141,000)	(500,000)
Other income and security gains	83,000	1,130,000	1,368,000	8,088,000
Total other expense	9,287,000	3,523,000	13,295,000	8,070,000
Income (loss) before income taxes	(9,409,000)	(1,271,000)	(11,876,000)	3,420,000
Income Tax Expense (Benefit)	(2,027,000)	(420,000)	(2,970,000)	(50,000)
Net Income	(7,382,000)	(851,000)	(8,906,000)	3,470,000
Assets	$ 20,648,000	$ 28,426,000	$ 20,648,000	$ 28,426,000