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Stockholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2020
Equity [Abstract]  
Schedule of Actual Capital Amounts and Ratios
The Company’s and the subsidiary banks’ 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, 2020      
Total Risk-Based Capital Ratio
Simmons First National Corporation$2,356,982 16.8 $1,122,372 8.0 N/A
Simmons Bank2,136,253 15.3 1,116,995 8.0 1,396,244 10.0 
Tier 1 Risk-Based Capital Ratio
Simmons First National Corporation1,884,562 13.4 843,834 6.0 N/A
Simmons Bank2,046,711 14.6 841,114 6.0 1,121,485 8.0 
Common Equity Tier 1 Capital Ratio
Simmons First National Corporation1,883,795 13.4 632,618 4.5 N/A
Simmons Bank2,046,711 14.6 630,836 4.5 911,207 6.5 
Tier 1 Leverage Ratio
Simmons First National Corporation1,884,562 9.1 828,379 4.0 N/A
Simmons Bank2,046,711 9.9 826,954 4.0 1,033,692 5.0 
December 31, 2019
Total Risk-Based Capital Ratio
Simmons First National Corporation$2,272,858 13.7 $1,327,216 8.0 N/A
Simmons Bank1,852,880 12.9 1,149,073 8.0 1,436,341 10.0 
Landmark Bank (1)
291,378 13.9 167,700 8.0 209,624 10.0 
Tier 1 Risk-Based Capital Ratio
Simmons First National Corporation1,807,954 10.9 995,204 6.0 N/A
Simmons Bank1,777,602 12.3 867,123 6.0 1,156,164 8.0 
Landmark Bank (1)
290,016 13.8 126,094 6.0 168,125 8.0 
Common Equity Tier 1 Capital Ratio
Simmons First National Corporation1,807,187 10.9 746,086 4.5 N/A
Simmons Bank1,777,602 12.3 650,342 4.5 939,383 6.5 
Landmark Bank (1)
270,016 12.9 94,192 4.5 136,055 6.5 
Tier 1 Leverage Ratio
Simmons First National Corporation1,807,954 9.6 753,314 4.0 N/A
Simmons Bank1,777,602 10.7 664,524 4.0 830,655 5.0 
Landmark Bank (1)
290,016 8.8 131,825 4.0 164,782 5.0 
______________________  
(1)    Landmark Bank was merged into Simmons Bank on February 14, 2020.