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Income Taxes - Income Tax Reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Reconciliation of income taxes computed at the United States federal statutory tax rates
Tax at U.S. statutory rate									$ 21,733	$ 45,294	$ 39,616
Increase (decrease) in taxes resulting from:
Tax-exempt interest income									(1,431)	(1,205)	(1,433)
BOLI income									(1,182)	(1,283)	(975)
Investment tax credits									(1,494)	(1,863)	(1,863)
Amortization of investment in low-income housing tax credits									1,280	1,575	1,592
State income tax expense, net of federal benefit									469	5,509	4,502
Other items, net									465	64	288
Total income tax expense	$ 6,818	$ 7,612	$ 4,637	$ 773	$ 9,424	$ 11,132	$ 13,945	$ 13,590	$ 19,840	$ 48,091	$ 41,727

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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