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Note 21 - Stockholders' Equity - Company's Significant Subsidiaries (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Common Equity Tier 1 Capital Required for Capital Adequacy to Risk Weighted Assets 4.50%  
Simmons First National Corporation [Member]    
Capital $ 1,388,970 $ 912,948
Capital to Risk Weighted Assets 11.40% 15.10%
Capital Required for Capital Adequacy $ 974,716 $ 483,681
Capital Required for Capital Adequacy to Risk Weighted Assets 8.00% 8.00%
Tier One Risk Based Capital $ 1,199,457 $ 872,707
Tier One Risk Based Capital to Risk Weighted Assets 9.80% 14.50%
Tier One Risk Based Capital Required for Capital Adequacy $ 734,361 $ 361,120
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets 6.00% 6.00%
Common Equity Tier 1 Capital $ 1,199,457 $ 812,310
Common Equity Tier 1 Capital to Average Assets 9.80% 13.50%
Common Equity Tier 1 Capital Required for Capital Adequacy $ 550,771 $ 270,770
Common Equity Tier 1 Capital Required for Capital Adequacy to Risk Weighted Assets 4.50% 4.50%
Tier One Leverage Capital $ 1,199,457 $ 872,707
Tier One Leverage Capital to Average Assets 9.20% 11.00%
Tier One Leverage Capital Required for Capital Adequacy $ 521,503 $ 317,348
Tier One Leverage Capital Required for Capital Adequacy to Average Assets 4.00% 4.00%
Simmons First National Bank [Member]    
Capital $ 877,728 $ 830,921
Capital to Risk Weighted Assets 12.10% 13.80%
Capital Required for Capital Adequacy $ 580,316 $ 481,693
Capital Required for Capital Adequacy to Risk Weighted Assets 8.00% 8.00%
Capital Required to be Well Capitalized $ 725,395 $ 602,117
Capital Required to be Well Capitalized to Risk Weighted Assets 10.00% 10.00%
Tier One Risk Based Capital $ 835,787 $ 790,673
Tier One Risk Based Capital to Risk Weighted Assets 11.50% 13.20%
Tier One Risk Based Capital Required for Capital Adequacy $ 436,063 $ 359,397
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets 6.00% 6.00%
Tier One Risk Based Capital Required to be Well Capitalized $ 581,417 $ 479,196
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets 8.00% 8.00%
Common Equity Tier 1 Capital $ 835,787 $ 790,673
Common Equity Tier 1 Capital to Average Assets 11.50% 13.20%
Common Equity Tier 1 Capital Required for Capital Adequacy $ 327,047 $ 269,548
Common Equity Tier 1 Capital Required for Capital Adequacy to Risk Weighted Assets 4.50% 4.50%
Common Equity Tier 1 Capital Required to Be Well Capitalized $ 472,401 $ 389,347
Common Equity Tier 1 Capital Required to Be Well Capitalized to Average Assets 6.50% 6.50%
Tier One Leverage Capital $ 835,787 $ 790,673
Tier One Leverage Capital to Average Assets 9.20% 10.00%
Tier One Leverage Capital Required for Capital Adequacy $ 363,386 $ 316,269
Tier One Leverage Capital Required for Capital Adequacy to Average Assets 4.00% 4.00%
Tier One Leverage Capital Required to be Well Capitalized $ 454,232 $ 395,337
Tier One Leverage Capital Required to be Well Capitalized to Average Assets 5.00% 5.00%
Bank SNB [Member]    
Capital $ 259,077  
Capital to Risk Weighted Assets 10.90%  
Capital Required for Capital Adequacy $ 190,148  
Capital Required for Capital Adequacy to Risk Weighted Assets 8.00%  
Capital Required to be Well Capitalized $ 237,685  
Capital Required to be Well Capitalized to Risk Weighted Assets 10.00%  
Tier One Risk Based Capital $ 255,360  
Tier One Risk Based Capital to Risk Weighted Assets 10.70%  
Tier One Risk Based Capital Required for Capital Adequacy $ 143,193  
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets 6.00%  
Tier One Risk Based Capital Required to be Well Capitalized $ 190,923  
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets 8.00%  
Common Equity Tier 1 Capital $ 255,360  
Common Equity Tier 1 Capital to Average Assets 10.70%  
Common Equity Tier 1 Capital Required for Capital Adequacy $ 107,394  
Common Equity Tier 1 Capital Required for Capital Adequacy to Risk Weighted Assets 4.50%  
Common Equity Tier 1 Capital Required to Be Well Capitalized $ 155,125  
Common Equity Tier 1 Capital Required to Be Well Capitalized to Average Assets 6.50%  
Tier One Leverage Capital $ 255,360  
Tier One Leverage Capital to Average Assets 10.10%  
Tier One Leverage Capital Required for Capital Adequacy $ 101,133  
Tier One Leverage Capital Required for Capital Adequacy to Average Assets 4.00%  
Tier One Leverage Capital Required to be Well Capitalized $ 126,416  
Tier One Leverage Capital Required to be Well Capitalized to Average Assets 5.00%  
Southwest Bank [Member]    
Capital $ 297,164  
Capital to Risk Weighted Assets 11.00%  
Capital Required for Capital Adequacy $ 216,119  
Capital Required for Capital Adequacy to Risk Weighted Assets 8.00%  
Capital Required to be Well Capitalized $ 270,149  
Capital Required to be Well Capitalized to Risk Weighted Assets 10.00%  
Tier One Risk Based Capital $ 294,874  
Tier One Risk Based Capital to Risk Weighted Assets 10.90%  
Tier One Risk Based Capital Required for Capital Adequacy $ 162,316  
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets 6.00%  
Tier One Risk Based Capital Required to be Well Capitalized $ 216,421  
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets 8.00%  
Common Equity Tier 1 Capital $ 294,874  
Common Equity Tier 1 Capital to Average Assets 10.90%  
Common Equity Tier 1 Capital Required for Capital Adequacy $ 121,737  
Common Equity Tier 1 Capital Required for Capital Adequacy to Risk Weighted Assets 4.50%  
Common Equity Tier 1 Capital Required to Be Well Capitalized $ 175,842  
Common Equity Tier 1 Capital Required to Be Well Capitalized to Average Assets 6.50%  
Tier One Leverage Capital $ 294,874  
Tier One Leverage Capital to Average Assets 12.20%  
Tier One Leverage Capital Required for Capital Adequacy $ 96,680  
Tier One Leverage Capital Required for Capital Adequacy to Average Assets 4.00%  
Tier One Leverage Capital Required to be Well Capitalized $ 120,850  
Tier One Leverage Capital Required to be Well Capitalized to Average Assets 5.00%