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Note 21 - Stockholders' Equity (Tables)

12 Months Ended

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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- Definition

Tabular disclosure of the capital amounts and ratios as of the balance sheet date, indicating whether the entity or entities are in compliance with regulatory capital requirements, by entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 505
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958570-112826

Reference 2: 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=84167132&loc=SL5958568-112826

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 505
-Section 50
-Paragraph 1H
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=84167132&loc=d3e65071-112826

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 505
-Section 50
-Paragraph 1G
-URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958577-112826

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