Accumulated Other Comprehensive Loss, Net of Tax (Schedule of Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Available-for-sale securities:
Net unrealized loss during the period	$ (878,366)	$ (85,368)	$ 68,116
Reclassification for net gain included in net income	6,751		(8)
Total available-for-sale securities	(871,615)	(85,368)	68,108
Derivative instruments:
Net unrealized (losses) arising during the year	(24,440)	(23,216)	27,683
Reclassification adjustment for net realized losses included in net income	3,932	4,415	11,420
Total derivative instruments	(20,508)	(18,801)	39,103
Defined benefit pension and other postretirement benefit plans:
Net actuarial (loss) arising during the year	(18,319)	12,052	(5,262)
Reclassification adjustment for amortization of net loss included in net income	2,210	4,102	3,976
Total loss (gain) recognized in (OCL) OCI	16,109	(16,154)	1,286
Available-for-sale securities:
Net unrealized loss during the period	237,710	22,480	(17,937)
Reclassification for net gain included in net income	1,791		(2)
Total investment securities available-for-sale	(235,919)	(22,480)	17,935
Derivative instruments:
Net unrealized (losses) arising during the year	6,630	6,107	(7,016)
Reclassification adjustment for net realized losses included in net income	(1,066)	(1,154)	(2,985)
Total derivative instruments	5,564	4,953	(10,001)
Defined benefit pension and other postretirement benefit plans:
Current year actuarial loss	4,969	(3,176)	1,375
Reclassification adjustment for amortization of net loss included in net income	(600)	(1,078)	(1,036)
Total defined benefit pension and postretirement benefit plans	4,369	(4,254)	339
Available-for-sale securities:
Net unrealized loss during the period	(640,656)	(62,888)	50,179
Reclassification for net gain included in net income	4,960		(6)
Total available-for-sale securities	(635,696)	(62,888)	50,173
Derivative instruments:
Net unrealized (losses) arising during the year	(17,810)	(17,109)	20,667
Reclassification adjustment for net realized losses included in net income	2,866	3,261	8,435
Total derivative instruments	(14,944)	(13,848)	29,102
Defined benefit pension and other postretirement benefit plans:
Current year actuarial loss	(13,350)	8,876	(3,887)
Reclassification adjustment for amortization of net loss included in net income	1,610	3,024	2,940
Total defined benefit pension and postretirement benefit plans	(11,740)	11,900	(947)
Other Comprehensive Income (Loss), Pre-Tax Amount	(908,232)	(88,015)	105,925
Other Comprehensive Income (Loss), Tax Benefit (Expense)	245,852	23,179	(27,597)
Other comprehensive (loss) income, net of tax	$ (662,380)	$ (64,836)	$ 78,328