Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2019

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.

	Actual			Minimum For Capital Adequacy Purposes			To Be Well Capitalized Under Prompt Corrective Action Provision
(In thousands)	Amount		Ratio (%)	Amount		Ratio (%)	Amount	Ratio (%)
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 Bank	1,852,880		12.9	1,149,073		8.0	1,436,341	10.0
Landmark Bank	291,378		13.9	167,700		8.0	209,624	10.0
Tier 1 Risk-Based Capital Ratio
Simmons First National Corporation	1,807,954		10.9	995,204		6.0	N/A
Simmons Bank	1,777,602		12.3	867,123		6.0	1,156,164	8.0
Landmark Bank	290,016		13.8	126,094		6.0	168,125	8.0
Common Equity Tier 1 Capital Ratio
Simmons First National Corporation	1,807,187		10.9	746,086		4.5	N/A
Simmons Bank	1,777,602		12.3	650,342		4.5	939,383	6.5
Landmark Bank	270,016		12.9	94,192		4.5	136,055	6.5
Tier 1 Leverage Ratio
Simmons First National Corporation	1,807,954		9.6	753,314		4.0	N/A
Simmons Bank	1,777,602		10.7	664,524		4.0	830,655	5.0
Landmark Bank	290,016		8.8	131,825		4.0	164,782	5.0
December 31, 2018
Total Risk-Based Capital Ratio
Simmons First National Corporation	$	1,778,938	13.3	$	1,070,038	8.0	N/A
Simmons Bank	1,532,864		11.5	1,066,340		8.0	1,332,925	10.0
Tier 1 Risk-Based Capital Ratio
Simmons First National Corporation	1,361,380		10.2	800,812		6.0	N/A
Simmons Bank	1,469,260		11.0	801,415		6.0	1,068,553	8.0
Common Equity Tier 1 Capital Ratio
Simmons First National Corporation	1,361,380		10.2	600,609		4.5	N/A
Simmons Bank	1,469,260		11.0	601,061		4.5	868,199	6.5
Tier 1 Leverage Ratio
Simmons First National Corporation	1,361,380		8.8	618,809		4.0	N/A
Simmons Bank	1,469,260		9.5	618,636		4.0	773,295	5.0