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Note 21 - Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2017
Notes Tables |
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table Text Block] |
|  | Actual |  | Minimum For Capital Adequacy Purposes |  | To Be Well Capitalized Under Prompt Corrective Action Provision
(In thousands) |  | Amount |  | Ratio (%) |  | Amount |  | Ratio (%) |  | Amount |  | Ratio (%)
As of December 31, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Risk-Based Capital Ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Simmons First National Corporation |  | $ | 1,388,970 |  |  |  | 11.4 |  |  | $ | 974,716 |  |  |  | 8.0 |  |  | $ | N/A |  |  |  |  |
Simmons Bank |  |  | 877,728 |  |  |  | 12.1 |  |  |  | 580,316 |  |  |  | 8.0 |  |  |  | 725,395 |  |  |  | 10.0 |
Bank SNB |  |  | 259,077 |  |  |  | 10.9 |  |  |  | 190,148 |  |  |  | 8.0 |  |  |  | 237,685 |  |  |  | 10.0 |
Southwest Bank |  |  | 297,164 |  |  |  | 11.0 |  |  |  | 216,119 |  |  |  | 8.0 |  |  |  | 270,149 |  |  |  | 10.0 |
Tier 1 Risk-Based Capital Ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Simmons First National Corporation |  |  | 1,199,457 |  |  |  | 9.8 |  |  |  | 734,361 |  |  |  | 6.0 |  |  |  | N/A |  |  |  |  |
Simmons Bank |  |  | 835,787 |  |  |  | 11.5 |  |  |  | 436,063 |  |  |  | 6.0 |  |  |  | 581,417 |  |  |  | 8.0 |
Bank SNB |  |  | 255,360 |  |  |  | 10.7 |  |  |  | 143,193 |  |  |  | 6.0 |  |  |  | 190,923 |  |  |  | 8.0 |
Southwest Bank |  |  | 294,874 |  |  |  | 10.9 |  |  |  | 162,316 |  |  |  | 6.0 |  |  |  | 216,421 |  |  |  | 8.0 |
Common Equity Tier 1 Capital Ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Simmons First National Corporation |  |  | 1,199,457 |  |  |  | 9.8 |  |  |  | 550,771 |  |  |  | 4.5 |  |  |  | N/A |  |  |  |  |
Simmons Bank |  |  | 835,787 |  |  |  | 11.5 |  |  |  | 327,047 |  |  |  | 4.5 |  |  |  | 472,401 |  |  |  | 6.5 |
Bank SNB |  |  | 255,360 |  |  |  | 10.7 |  |  |  | 107,394 |  |  |  | 4.5 |  |  |  | 155,125 |  |  |  | 6.5 |
Southwest Bank |  |  | 294,874 |  |  |  | 10.9 |  |  |  | 121,737 |  |  |  | 4.5 |  |  |  | 175,842 |  |  |  | 6.5 |
Tier 1 Leverage Ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Simmons First National Corporation |  |  | 1,199,457 |  |  |  | 9.2 |  |  |  | 521,503 |  |  |  | 4.0 |  |  |  | N/A |  |  |  |  |
Simmons Bank |  |  | 835,787 |  |  |  | 9.2 |  |  |  | 363,386 |  |  |  | 4.0 |  |  |  | 454,232 |  |  |  | 5.0 |
Bank SNB |  |  | 255,360 |  |  |  | 10.1 |  |  |  | 101,133 |  |  |  | 4.0 |  |  |  | 126,416 |  |  |  | 5.0 |
Southwest Bank |  |  | 294,874 |  |  |  | 12.2 |  |  |  | 96,680 |  |  |  | 4.0 |  |  |  | 120,850 |  |  |  | 5.0 |
As of December 31, 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Risk-Based Capital Ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Simmons First National Corporation |  | $ | 912,948 |  |  |  | 15.1 |  |  | $ | 483,681 |  |  |  | 8.0 |  |  | $ | N/A |  |  |  |  |
Simmons Bank |  |  | 830,921 |  |  |  | 13.8 |  |  |  | 481,693 |  |  |  | 8.0 |  |  |  | 602,117 |  |  |  | 10.0 |
Tier 1 Risk-Based Capital Ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Simmons First National Corporation |  |  | 872,707 |  |  |  | 14.5 |  |  |  | 361,120 |  |  |  | 6.0 |  |  |  | N/A |  |  |  |  |
Simmons Bank |  |  | 790,673 |  |  |  | 13.2 |  |  |  | 359,397 |  |  |  | 6.0 |  |  |  | 479,196 |  |  |  | 8.0 |
Common Equity Tier 1 Capital Ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Simmons First National Corporation |  |  | 812,310 |  |  |  | 13.5 |  |  |  | 270,770 |  |  |  | 4.5 |  |  |  | N/A |  |  |  |  |
Simmons Bank |  |  | 790,673 |  |  |  | 13.2 |  |  |  | 269,548 |  |  |  | 4.5 |  |  |  | 389,347 |  |  |  | 6.5 |
Tier 1 Leverage Ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Simmons First National Corporation |  |  | 872,707 |  |  |  | 11.0 |  |  |  | 317,348 |  |  |  | 4.0 |  |  |  | N/A |  |  |  |  |
Simmons Bank |  |  | 790,673 |  |  |  | 10.0 |  |  |  | 316,269 |  |  |  | 4.0 |  |  |  | 395,337 |  |  |  | 5.0 |

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