Accumulated Other Comprehensive Income (Schedule of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2022		Dec. 31, 2021		Dec. 31, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income		$ (1,086,864)		$ 77,080		$ 331,377
Other Comprehensive Income (Loss), before Reclassifications, before Tax		(1,550,290)		(320,495)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax		(1,636)		(18,569)
Other Comprehensive Income (Loss), before Tax		(1,551,926)		(339,064)
Other Comprehensive Income (Loss), Tax		387,982		84,767
Other comprehensive income (loss)		(1,163,944)		(254,297)		220,933
Unrealized Gain Loss on Securities Other [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income		(1,124,915)		23,174	[1]	263,801
Other Comprehensive Income (Loss), before Reclassifications, before Tax		(1,551,059)		(324,122)
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax		20,273		3,284
Other Comprehensive Income (Loss), before Tax		(1,530,786)		(320,838)
Other Comprehensive Income (Loss), Tax		382,697		80,211
Other comprehensive income (loss)		(1,148,089)		(240,627)
Pension Loss [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income		(17,186)		(20,668)		(25,118)
Other Comprehensive Income (Loss), before Reclassifications, before Tax		3,197		3,627
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax		1,446		2,307
Other Comprehensive Income (Loss), before Tax		4,643		5,934
Other Comprehensive Income (Loss), Tax		(1,161)		(1,484)
Other comprehensive income (loss)		3,482		4,450
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income		55,237	[2]	74,574	[2]	$ 92,694
Other Comprehensive Income (Loss), before Reclassifications, before Tax	[2]	(2,428)		0
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	[2]	(23,355)		(24,160)
Other Comprehensive Income (Loss), before Tax	[2]	(25,783)		(24,160)
Other Comprehensive Income (Loss), Tax	[2]	6,446		6,040
Other comprehensive income (loss)	[2]	$ (19,337)		$ (18,120)

[1] The pre-tax amounts reclassified from accumulated other comprehensive income to current earnings are included in "investment securities gains (losses), net" in the consolidated statements of income.

[2] The pre-tax amounts reclassified from accumulated other comprehensive income to current earnings are included in "interest and fees on loans" in the consolidated statements of income.