Income Taxes - Reconciliation between Statutory Federal Income Tax Rate and Effective Income Tax Rate (Detail)	3 Months Ended	6 Months Ended
Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Statutory federal income tax rate	21.00%	21.00%	21.00%	21.00%
Effect of non-taxable interest income	(1.24%)	(0.70%)	(0.84%)	(0.74%)
Stock compensation	0.78%	0.18%	0.56%	0.28%
State income taxes, net of federal benefit	2.47%	2.70%	2.64%	2.60%
Executive officer compensation & other	0.89%	(0.08%)	0.20%	(0.32%)
Effective income tax rate	23.90%	23.10%	23.56%	22.82%

Effective income tax rate reconciliation executive officer compensation and other reconciling items percent.

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- Definition

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

+ References

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- Definition

Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

+ References

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- Definition

Percentage 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 nondeductible expense for share-based payment arrangement.

+ References

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- Definition

Percentage 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 applicable to state and local income tax expense (benefit), net of federal tax expense (benefit).

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Percentage 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 income (loss) exempt from income taxes.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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