Segment Information (Schedule Of Operating Results By Segment) (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($) segments	Sep. 30, 2022 USD ($)	Dec. 31, 2022 USD ($)
Segment Reporting Information [Line Items]
Number of Operating Segments | segments			2
Net interest income	$ 94,269	$ 90,828	$ 278,039	$ 252,453
Provision for credit losses	(1,580)	3,190	1,095	1,576
Other income and security gains	27,713	46,694	77,115	109,543
Total other expense	77,808	82,903	230,196	220,324
Income (loss) before income taxes	45,754	51,429	123,863	140,096
Income Tax Expense (Benefit)	8,837	9,361	21,629	24,829
Net Income	36,917	42,068	102,234	115,267
Assets	10,000,914	9,855,047	10,000,914	9,855,047	$ 9,854,993
PNB [Member]
Segment Reporting Information [Line Items]
Net interest income	96,078	92,035	283,216	254,818
Provision for credit losses	(1,538)	3,235	1,901	2,045
Other income and security gains	27,888	28,918	77,241	89,420
Total other expense	74,623	79,070	220,741	209,500
Income (loss) before income taxes	50,881	38,648	137,815	132,693
Income Tax Expense (Benefit)	10,093	7,133	25,273	24,770
Net Income	40,788	31,515	112,542	107,923
Assets	9,959,528	9,816,644	9,959,528	9,816,644
All Other [Member]
Segment Reporting Information [Line Items]
Net interest income	(1,809)	(1,207)	(5,177)	(2,365)
Provision for credit losses	(42)	(45)	(806)	(469)
Other income and security gains	(175)	17,776	(126)	20,123
Total other expense	3,185	3,833	9,455	10,824
Income (loss) before income taxes	(5,127)	12,781	(13,952)	7,403
Income Tax Expense (Benefit)	(1,256)	2,228	(3,644)	59
Net Income	(3,871)	10,553	(10,308)	7,344
Assets	$ 41,386	$ 38,403	$ 41,386	$ 38,403