Segment Information (Schedule Of Operating Results By Segment) (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023 USD ($)	Jun. 30, 2022 USD ($)	Jun. 30, 2023 USD ($) segments	Jun. 30, 2022 USD ($)	Dec. 31, 2022 USD ($)
Segment Reporting Information [Line Items]
Number of Operating Segments | segments			1
Net interest income	$ 91,572	$ 83,939	$ 183,770	$ 161,625
Provision for (recovery of) credit losses	2,492	2,991	2,675	(1,614)
Other income and security gains	25,015	31,193	49,402	62,849
Total other expense	75,885	70,048	152,388	137,421
Income (loss) before income taxes	38,210	42,093	78,109	88,667
Income Tax Expense (Benefit)	6,626	7,769	12,792	15,468
Net Income	31,584	34,324	65,317	73,199
Assets	9,899,551	9,826,670	9,899,551	9,826,670	$ 9,854,993
PNB [Member]
Segment Reporting Information [Line Items]
Net interest income	93,549	83,411	187,138	162,783
Provision for (recovery of) credit losses	2,524	3,357	3,439	(1,190)
Other income and security gains	25,091	29,255	49,353	60,502
Total other expense	73,121	66,214	146,118	130,430
Income (loss) before income taxes	42,995	43,095	86,934	94,045
Income Tax Expense (Benefit)	7,510	8,155	15,180	17,637
Net Income	35,485	34,940	71,754	76,408
Assets	9,857,452	9,794,711	9,857,452	9,794,711
All Other [Member]
Segment Reporting Information [Line Items]
Net interest income	(1,977)	528	(3,368)	(1,158)
Provision for (recovery of) credit losses	(32)	(366)	(764)	(424)
Other income and security gains	(76)	1,938	49	2,347
Total other expense	2,764	3,834	6,270	6,991
Income (loss) before income taxes	(4,785)	(1,002)	(8,825)	(5,378)
Income Tax Expense (Benefit)	(884)	(386)	(2,388)	(2,169)
Net Income	(3,901)	(616)	(6,437)	(3,209)
Assets	$ 42,099	$ 31,959	$ 42,099	$ 31,959