Income Taxes - Reconciliation from Statutory Federal Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Reconciliation from statutory federal income taxes to the company's effective income taxes
Statutory federal income tax provision	$ 96,773	$ 15,246	$ 45,729
State taxes, net of federal income tax effect	34,001	4,757	15,764
Cash surrender life insurance	(1,890)	(1,163)	(565)
Tax-exempt interest	(6,803)	(4,073)	(1,503)
Non-deductible merger costs	0	703	0
LIHTC investments	(2,716)	(2,259)	(1,570)
Stock-based compensation shortfall (windfall)	(1,356)	407	(728)
Effect of the CARES Act	0	(2,636)	0
Section 162(m) of the Internal Revenue Code	2,015	968	530
Other	910	300	378
Total income tax provision	$ 120,934	$ 12,250	$ 58,035

Effective Income Tax Rate Reconciliation, Acquisition of Business, Amount

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Amount of difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operation, attributable to expense for award under share-based payment arrangement. Excludes expense determined to be nondeductible upon grant or after for award under share-based payment arrangement.

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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 the expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to deduction for qualified production activity.

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