Income Taxes (Schedule of Effective Income Tax Rate Reconciliation) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Income tax expense at federal statutory rate	$ 112,111	$ 58,795	$ 102,205
SALT expense, net of federal	19,924	7,884	14,782
Tax-exempt interest income, net	(6,814)	(7,181)	(6,752)
Increase in cash surrender value of life insurance	(3,030)	(3,058)	(3,069)
Tax deficiencies (excess tax benefits), net	(1,479)	484	(2,251)
Non-deductible FDIC deposit insurance premiums	2,064	2,172	1,904
Non-deductible merger-related expenses	3,451	0	0
Other, net	(1,230)	257	(2,850)
Income tax expense	$ 124,997	$ 59,353	$ 103,969
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Income tax expense at federal statutory rate	21.00%	21.00%	21.00%
SALT expense, net of federal	3.70%	2.80%	3.00%
Tax-exempt interest income, net	(1.30%)	(2.60%)	(1.40%)
Increase in cash surrender value of life insurance	(0.60%)	(1.10%)	(0.60%)
Tax deficiencies (excess tax benefits), net	(0.30%)	0.20%	(0.40%)
Non-deductible FDIC deposit insurance premiums	0.40%	0.80%	0.40%
Non-deductible merger-related expenses	0.70%	0.00%	0.00%
Other, net	(0.20%)	0.10%	(0.60%)
Income tax expense and effective tax rate	23.40%	21.20%	21.40%