Segment Information (Schedule Of Operating Results By Segment) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2022 USD ($) segments	Mar. 31, 2021 USD ($)	Dec. 31, 2021 USD ($)
Segment Reporting Information [Line Items]
Number of Operating Segments | segments	1
Net interest income	$ 77,686	$ 80,734
Recovery of credit losses	(4,605)	(4,855)
Other income and security gains	31,656	34,089
Total other expense	67,373	67,865
Income (loss) before income taxes	46,574	51,813
Income Tax Expense (Benefit)	7,699	8,982
Net Income	38,875	42,831
Assets	9,576,352	9,914,069	$ 9,560,254
PNB [Member]
Segment Reporting Information [Line Items]
Net interest income	79,372	82,086
Recovery of credit losses	(4,547)	(4,194)
Other income and security gains	31,247	32,800
Total other expense	64,216	63,576
Income (loss) before income taxes	50,950	55,504
Income Tax Expense (Benefit)	9,482	10,382
Net Income	41,468	45,122
Assets	9,544,545	9,884,055
All Other [Member]
Segment Reporting Information [Line Items]
Net interest income	(1,686)	(1,352)
Recovery of credit losses	(58)	(661)
Other income and security gains	409	1,289
Total other expense	3,157	4,289
Income (loss) before income taxes	(4,376)	(3,691)
Income Tax Expense (Benefit)	(1,783)	(1,400)
Net Income	(2,593)	(2,291)
Assets	$ 31,807	$ 30,014