Segment Information (Schedule Of Operating Results By Segment) (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($) segments	Sep. 30, 2021 USD ($)	Dec. 31, 2021 USD ($)
Segment Reporting Information [Line Items]
Number of Operating Segments | segments			1
Net interest income	$ 90,828	$ 81,602	$ 252,453	$ 246,187
Provision for (recovery of) credit losses	3,190	1,972	1,576	(6,923)
Other income and security gains	46,694	32,411	109,543	97,738
Total other expense	82,903	68,489	220,324	207,754
Income (loss) before income taxes	51,429	43,552	140,096	143,094
Income Tax Expense (Benefit)	9,361	8,118	24,829	25,697
Net Income	42,068	35,434	115,267	117,397
Assets	9,855,047	10,034,018	9,855,047	10,034,018	$ 9,560,254
PNB [Member]
Segment Reporting Information [Line Items]
Net interest income	92,035	82,835	254,818	247,596
Provision for (recovery of) credit losses	3,235	4,276	2,045	(3,670)
Other income and security gains	28,918	31,332	89,420	95,258
Total other expense	79,070	64,663	209,500	195,361
Income (loss) before income taxes	38,648	45,228	132,693	151,163
Income Tax Expense (Benefit)	7,133	8,777	24,770	28,694
Net Income	31,515	36,451	107,923	122,469
Assets	9,816,644	10,012,868	9,816,644	10,012,868
All Other [Member]
Segment Reporting Information [Line Items]
Net interest income	(1,207)	(1,233)	(2,365)	(1,409)
Provision for (recovery of) credit losses	(45)	(2,304)	(469)	(3,253)
Other income and security gains	17,776	1,079	20,123	2,480
Total other expense	3,833	3,826	10,824	12,393
Income (loss) before income taxes	12,781	(1,676)	7,403	(8,069)
Income Tax Expense (Benefit)	2,228	(659)	59	(2,997)
Net Income	10,553	(1,017)	7,344	(5,072)
Assets	$ 38,403	$ 21,150	$ 38,403	$ 21,150