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Income Taxes (Effective Income Tax Reconciliation) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Expense (Benefit) Reconciliation
Income tax expense at statutory federal income tax rate	$ 101,779	$ 160,653	$ 114,944
State income tax expense, net of federal income tax benefit	11,168	33,764	17,270
Adjustment related to reduction in U.S. federal statutory income tax rate	0	0	(9,865)
Low income housing tax credits and other tax benefits	(13,858)	(8,454)	(6,421)
Low income housing tax credit amortization	11,247	6,871	5,316
Goodwill impairment	9,424	0	0
Effective Income Tax Rate Reconciliation, Tax Exempt Income, Amount	9,207	6,564	3,599
FDIC premiums	4,744	5,802	2,529
Executive compensation	1,501	6,385	443
General business tax credits	(657)	(678)	(1,163)
Excess tax benefit from share-based compensation	311	(1,337)	(2,801)
Change in valuation allowance	0	0	(3,431)
Other, net	(5,482)	4,793	5,656
Total income tax expense	$ 110,970	$ 201,235	$ 118,878
Effective tax rate	22.90%	26.30%	21.70%
Reclassification from adoption of ASU 2018-02			$ 0

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