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Note 20 - Stockholder' Equity (Tables) | 12 Months Ended
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Dec. 31, 2016
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, 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 |
As of December 31, 2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Risk-Based Capital Ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Simmons First National Corporation |  | $ | 843,227 |  |  |  | 16.7 |  |  | $ | 403,941 |  |  |  | 8.0 |  |  | $ | N/A |  |  |  |  |
Simmons Bank |  |  | 734,170 |  |  |  | 14.6 |  |  |  | 402,285 |  |  |  | 8.0 |  |  |  | 502,856 |  |  |  | 10.0 |
Tier 1 Risk-Based Capital Ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Simmons First National Corporation |  |  | 808,159 |  |  |  | 16.0 |  |  |  | 303,060 |  |  |  | 6.0 |  |  |  | N/A |  |  |  |  |
Simmons Bank |  |  | 699,102 |  |  |  | 13.9 |  |  |  | 301,771 |  |  |  | 6.0 |  |  |  | 402,361 |  |  |  | 8.0 |
Common Equity Tier 1 Capital Ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Simmons First National Corporation |  |  | 716,737 |  |  |  | 14.2 |  |  |  | 227,135 |  |  |  | 4.5 |  |  |  | N/A |  |  |  |  |
Simmons Bank |  |  | 699,102 |  |  |  | 13.9 |  |  |  | 226,328 |  |  |  | 4.5 |  |  |  | 326,918 |  |  |  | 6.5 |
Tier 1 Leverage Ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Simmons First National Corporation |  |  | 808,159 |  |  |  | 11.2 |  |  |  | 288,628 |  |  |  | 4.0 |  |  |  | N/A |  |  |  |  |
Simmons Bank |  |  | 699,102 |  |  |  | 9.7 |  |  |  | 288,289 |  |  |  | 4.0 |  |  |  | 360,362 |  |  |  | 5.0 |

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