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Stockholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2023
Equity [Abstract]  
Schedule of Actual Capital Amounts and Ratios
The Company’s and the Bank’s actual capital amounts and ratios are presented in the following table.

 ActualMinimum
For Capital
Adequacy Purposes		To Be Well
Capitalized Under
Prompt Corrective
Action Provision
(In thousands)AmountRatio (%)AmountRatio (%)AmountRatio (%)
December 31, 2023      
Total Risk-Based Capital Ratio
Simmons First National Corporation$2,964,917 14.4 $1,647,176 8.0 N/A
Simmons Bank2,834,126 13.8 1,642,972 8.0 2,053,714 10.0 
Tier 1 Risk-Based Capital Ratio
Simmons First National Corporation2,493,799 12.1 1,236,595 6.0 N/A
Simmons Bank2,663,153 13.0 1,229,148 6.0 1,638,863 8.0 
Common Equity Tier 1 Capital Ratio
Simmons First National Corporation2,493,799 12.1 927,446 4.5 N/A
Simmons Bank2,663,153 13.0 921,861 4.5 1,331,577 6.5 
Tier 1 Leverage Ratio
Simmons First National Corporation2,493,799 9.4 1,061,191 4.0 N/A
Simmons Bank2,663,153 10.0 1,065,261 4.0 1,331,577 5.0 
December 31, 2022
Total Risk-Based Capital Ratio
Simmons First National Corporation$2,948,490 14.2 $1,661,121 8.0 N/A
Simmons Bank2,743,625 13.3 1,650,301 8.0 2,062,876 10.0 
Tier 1 Risk-Based Capital Ratio
Simmons First National Corporation2,466,874 11.9 1,243,802 6.0 N/A
Simmons Bank2,628,002 12.7 1,241,576 6.0 1,655,434 8.0 
Common Equity Tier 1 Capital Ratio
Simmons First National Corporation2,466,874 11.9 932,852 4.5 N/A
Simmons Bank2,628,002 12.7 931,182 4.5 1,345,040 6.5 
Tier 1 Leverage Ratio
Simmons First National Corporation2,466,874 9.3 1,061,021 4.0 N/A
Simmons Bank2,628,002 10.0 1,051,201 4.0 1,314,001 5.0