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Income Taxes - Reconciliation of Income Tax Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Income Tax Disclosure [Abstract]
Computed at the statutory rate	$ 19,305	$ 15,620	$ 36,477	$ 36,180
State income taxes, net of federal tax benefit	1,488	2,296	3,378	4,359
Stock-based compensation	(66)	43	37	69
Tax exempt interest income	(2,741)	(1,421)	(5,251)	(2,842)
Tax exempt earnings on BOLI	(319)	(212)	(560)	(531)
Federal tax credits	(589)	(1,034)	(1,179)	(2,068)
Other differences, net	(60)	301	(1,521)	1,120
Actual tax provision	$ 17,018	$ 15,593	$ 31,381	$ 36,287

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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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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other adjustments.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to tax credits. Including, but not limited to, research credit, foreign tax credit, investment tax credit, and other tax credits.

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