Note 15 - Shareholders' Equity and Regulatory Matters - (Tables)

12 Months Ended

Dec. 31, 2018

Notes Tables

Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table Text Block]

To Be Well

Capitalized Under

For Capital

Prompt Corrective

Business First Bancshares, Inc. (Consolidated)

Actual

Adequacy Purposes

Action Provisions

Amount

Ratio

Amount

Ratio

Amount

Ratio

(Dollars in thousands)

December 31, 2018:

Total Capital (to Risk-Weighted Assets)

$

242,144

13.91

%

N/A

N/A

N/A

N/A

Tier I Capital (to Risk-Weighted Assets)

$

205,924

11.83

%

N/A

N/A

N/A

N/A

Common Equity Tier 1 Capital (to Risk-Weighted Assets)

$

205,924

11.83

%

N/A

N/A

N/A

N/A

Tier I Leveraged Capital (to Average Assets)

$

205,924

11.66

%

N/A

N/A

N/A

N/A

December 31, 2017:

Total Capital (to Risk-Weighted Assets)

$

181,565

15.23

%

N/A

N/A

N/A

N/A

Tier I Capital (to Risk-Weighted Assets)

$

172,800

14.49

%

N/A

N/A

N/A

N/A

Common Equity Tier 1 Capital (to Risk-Weighted Assets)

$

172,800

14.49

%

N/A

N/A

N/A

N/A

Tier I Leveraged Capital (to Average Assets)

$

172,800

13.53

%

N/A

N/A

N/A

N/A

											To Be Well
											Capitalized Under
						For Capital					Prompt Corrective
Business First Bank	Actual					Adequacy Purposes					Action Provisions
	Amount		Ratio			Amount		Ratio			Amount		Ratio
	(Dollars in thousands)
December 31, 2018:
Total Capital (to Risk-Weighted Assets)	$	224,356		12.90	%	$	139,126		8.00	%	$	173,908		10.00	%
Tier I Capital (to Risk-Weighted Assets)	$	213,136		12.26	%	$	104,345		6.00	%	$	139,126		8.00	%
Common Equity Tier 1 Capital (to Risk-Weighted Assets)	$	213,136		12.26	%	$	78,259		4.50	%	$	113,040		6.50	%
Tier I Leveraged Capital (to Average Assets)	$	213,136		12.08	%	$	70,592		4.00	%	$	88,241		5.00	%
December 31, 2017:
Total Capital (to Risk-Weighted Assets)	$	120,806		10.24	%	$	94,377		8.00	%	$	117,971		10.00	%
Tier I Capital (to Risk-Weighted Assets)	$	112,041		9.50	%	$	70,783		6.00	%	$	94,377		8.00	%
Common Equity Tier 1 Capital (to Risk-Weighted Assets)	$	112,041		9.50	%	$	53,087		4.50	%	$	76,681		6.50	%
Tier I Leveraged Capital (to Average Assets)	$	112,041		8.78	%	$	51,040		4.00	%	$	63,800		5.00	%