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Income Taxes (Tables)
3 Months Ended
Mar. 31, 2022
Income Tax Disclosure [Abstract]  
Income Tax Rate Reconciliation
Income Tax Rate Reconciliation
Three Months Ended March 31,
20222021
Tax provision at U.S. federal statutory rate$114 $63 
Tax-exempt interest(9)(11)
Executive compensation
Stock-based compensation(10)(1)
Other (4)(2)
Provision for income taxes$98 $54 
Roll-forward of Unrecognized Tax Benefits
Rollforward of Unrecognized Tax Benefits
 
Three Months Ended March 31,
 20222021
Balance, beginning of period$16 $15 
Gross increases - tax positions in prior period— — 
Gross decreases - tax positions in prior period— — 
Gross increases - tax positions in current period— 
Balance, end of period$17 $15