Income Taxes - Reconciliation between Statutory Federal Income Tax Rate and Effective Income Tax Rate (Detail)	3 Months Ended	9 Months Ended
Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Income Tax Disclosure [Abstract]
Statutory federal income tax rate	21.00%	21.00%	21.00%	21.00%
Effect of non-taxable interest income	(1.28%)	(0.64%)	(0.98%)	(0.71%)
Stock compensation	0.58%	0.29%	0.57%	0.29%
State income taxes, net of federal benefit	2.45%	2.73%	2.57%	2.64%
Executive officer compensation & other	(0.25%)	0.47%	0.06%	(0.07%)
Effective income tax rate	22.50%	23.85%	23.22%	23.15%

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

Reference 1: http://www.xbrl.org/2003/role/exampleRef
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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).

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
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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 attributable to income (loss) exempt from income taxes.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
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-Section 50
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-URI https://asc.fasb.org/1943274/2147482685/740-10-50-12A

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