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Income Taxes
 3 Months Ended
Mar. 31, 2022
Income Tax Disclosure [Abstract]  
Income Taxes Income Taxes
The income tax expense included in the accompanying consolidated statements of income consists of the following (in thousands):
 Three Months Ended
March 31,
 20222021
Current income tax expense$2,861 $2,589 
Deferred income tax expense (benefit)285 2,161 
Income tax expense$3,146 $4,750 

The net deferred tax asset totaled $19.1 million at March 31, 2022 as compared to a net deferred tax liability of $17.8 million at December 31, 2021.  No valuation allowance was recorded at March 31, 2022 or December 31, 2021, as management believes it is more likely than not that all of the deferred tax asset items will be realized in future years. Unrecognized tax benefits were not material at March 31, 2022 or December 31, 2021.
We recognized income tax expense of $3.1 million for an ETR of 11.2% for the three months ended March 31, 2022, compared to income tax expense of $4.8 million, for an ETR of 12.2%, for the three months ended March 31, 2021. The lower ETR for the three months ended March 31, 2022 was primarily due to an increase in tax-exempt income as a percentage of pre-tax income as compared to the same periods in 2021. The ETR differs from the statutory rate of 21% for the three months ended March 31, 2022 and 2021 primarily due to the effect of tax-exempt income from municipal loans and securities, as well as BOLI. We file income tax returns in the U.S. federal jurisdictions and in certain states. We are no longer subject to U.S. federal income tax examinations by tax authorities for years before 2018 or Texas state tax examinations by tax authorities for years before 2017.