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Note 20 - Stockholders' Equity - Company's Significant Subsidiaries (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Simmons First National Corporation [Member] |  |
Capital | $ 912,948 | $ 843,227
Capital to Risk Weighted Assets | 15.10% | 16.70%
Capital Required for Capital Adequacy | $ 483,681 | $ 403,941
Capital Required for Capital Adequacy to Risk Weighted Assets | 8.00% | 8.00%
Tier One Risk Based Capital | $ 872,707 | $ 808,159
Tier One Risk Based Capital to Risk Weighted Assets | 14.50% | 16.00%
Tier One Risk Based Capital Required for Capital Adequacy | $ 361,120 | $ 303,060
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets | 6.00% | 6.00%
Common Equity Tier 1 Capital | $ 812,310 | $ 716,737
Common Equity Tier 1 Capital to Average Assets | 13.50% | 14.20%
Common Equity Tier 1 Capital Required for Capital Adequacy | $ 270,770 | $ 227,135
Common Equity Tier 1 Capital Required for Capital Adequacy to Risk Weighted Assets | 4.50% | 4.50%
Tier One Leverage Capital | $ 872,707 | $ 808,159
Tier One Leverage Capital to Average Assets | 11.00% | 11.20%
Tier One Leverage Capital Required for Capital Adequacy | $ 317,348 | $ 288,628
Tier One Leverage Capital Required for Capital Adequacy to Average Assets | 4.00% | 4.00%
Simmons First National Bank [Member] |  |
Capital | $ 830,921 | $ 734,170
Capital to Risk Weighted Assets | 13.80% | 14.60%
Capital Required for Capital Adequacy | $ 481,693 | $ 402,285
Capital Required for Capital Adequacy to Risk Weighted Assets | 8.00% | 8.00%
Capital Required to be Well Capitalized | $ 602,117 | $ 502,856
Capital Required to be Well Capitalized to Risk Weighted Assets | 10.00% | 10.00%
Tier One Risk Based Capital | $ 790,673 | $ 699,102
Tier One Risk Based Capital to Risk Weighted Assets | 13.20% | 13.90%
Tier One Risk Based Capital Required for Capital Adequacy | $ 359,397 | $ 301,771
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 | $ 479,196 | $ 402,361
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets | 8.00% | 8.00%
Common Equity Tier 1 Capital | $ 790,673 | $ 699,102
Common Equity Tier 1 Capital to Average Assets | 13.20% | 13.90%
Common Equity Tier 1 Capital Required for Capital Adequacy | $ 269,548 | $ 226,328
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 | $ 389,347 | $ 326,918
Common Equity Tier 1 Capital Required to Be Well Capitalized to Average Assets | 6.50% | 6.50%
Tier One Leverage Capital | $ 790,673 | $ 699,102
Tier One Leverage Capital to Average Assets | 10.00% | 9.70%
Tier One Leverage Capital Required for Capital Adequacy | $ 316,269 | $ 288,289
Tier One Leverage Capital Required for Capital Adequacy to Average Assets | 4.00% | 4.00%
us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalized | $ 395,337 | $ 360,362
Tier One Leverage Capital Required to be Well Capitalized to Average Assets | 5.00% | 5.00%

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- Definition The Tier 1 capital ratio (Tier 1 capital divided by risk weighted assets) required to be categorized as "well capitalized" under the regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 + Details
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