REGULATORY MATTERS - Company's and Bank's Actual Capital Amounts and Ratios (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Consolidated
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier 1 Leverage Ratio (tier 1 capital to average assets) Actual Amount	$ 741,159	$ 555,447
Tier 1 Leverage Ratio (tier 1 capital to average assets) Actual Ratio	9.713%	8.675%
Tier 1 Leverage Ratio (tier 1 capital to average assets) For Capital Adequacy Purposes Amount	$ 305,231	$ 256,106
Tier 1 Leverage Ratio (tier 1 capital to average assets) For Capital Adequacy Purposes Ratio	4.00%	4.00%
CET1 Ratio (common equity tier 1 capital to risk weighted assets) Actual Amount	$ 658,529	$ 476,806
CET1 Ratio (common equity tier 1 capital to risk weighted assets) Actual Ratio	10.291%	8.317%
CET1 Ratio (common equity tier 1 capital to risk weighted assets) Adequacy Purposes Amount	$ 367,940	$ 293,811
CET1 Ratio (common equity tier 1 capital to risk weighted assets) Adequacy Purposes Ratio	5.75%	5.125%
Tier 1 Capital Ratio (tier 1 capital to risk weighted assets) Actual Amount	$ 741,159	$ 555,447
Tier 1 Capital Ratio (tier 1 capital to risk weighted assets) Actual Ratio	11.582%	9.689%
Tier 1 Capital Ratio (tier 1 capital to risk weighted assets) For Capital Adequacy Purposes Amount	$ 463,925	$ 379,804
Tier 1 Capital Ratio (tier 1 capital to risk weighted assets) For Capital Adequacy Purposes Ratio	7.25%	6.625%
Total Capital Ratio (total capital to risk weighted assets) Actual Amount	$ 840,745	$ 579,367
Total Capital Ratio (total capital to risk weighted assets) Actual Ratio	13.139%	10.106%
Total Capital Ratio (total capital to risk weighted assets) For Capital Adequacy Purposes Amount	$ 591,904	$ 494,462
Total Capital Ratio (total capital to risk weighted assets) For Capital Adequacy Purposes Ratio	9.25%	8.625%
Ameris Bank
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier 1 Leverage Ratio (tier 1 capital to average assets) Actual Amount	$ 805,238	$ 592,641
Tier 1 Leverage Ratio (tier 1 capital to average assets) Actual Ratio	10.564%	9.266%
Tier 1 Leverage Ratio (tier 1 capital to average assets) For Capital Adequacy Purposes Amount	$ 304,904	$ 255,828
Tier 1 Leverage Ratio (tier 1 capital to average assets) For Capital Adequacy Purposes Ratio	4.00%	4.00%
Tier 1 Leverage Ratio (tier 1 capital to average assets) To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	$ 381,131	$ 319,785
Tier 1 Leverage Ratio (tier 1 capital to average assets) To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio	5.00%	5.00%
CET1 Ratio (common equity tier 1 capital to risk weighted assets) Actual Amount	$ 805,238	$ 592,641
CET1 Ratio (common equity tier 1 capital to risk weighted assets) Actual Ratio	12.644%	10.351%
CET1 Ratio (common equity tier 1 capital to risk weighted assets) Adequacy Purposes Amount	$ 366,186	$ 293,422
CET1 Ratio (common equity tier 1 capital to risk weighted assets) Adequacy Purposes Ratio	5.75%	5.125%
CET1 Ratio (common equity tier 1 capital to risk weighted assets) To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	$ 413,949	$ 372,145
CET1 Ratio (common equity tier 1 capital to risk weighted assets) To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio	6.50%	6.50%
Tier 1 Capital Ratio (tier 1 capital to risk weighted assets) Actual Amount	$ 805,238	$ 592,641
Tier 1 Capital Ratio (tier 1 capital to risk weighted assets) Actual Ratio	12.644%	10.351%
Tier 1 Capital Ratio (tier 1 capital to risk weighted assets) For Capital Adequacy Purposes Amount	$ 461,712	$ 379,301
Tier 1 Capital Ratio (tier 1 capital to risk weighted assets) For Capital Adequacy Purposes Ratio	7.25%	6.625%
Tier 1 Capital Ratio (tier 1 capital to risk weighted assets) To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	$ 509,476	$ 458,024
Tier 1 Capital Ratio (tier 1 capital to risk weighted assets) To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio	8.00%	8.00%
Total Capital Ratio (total capital to risk weighted assets) Actual Amount	$ 831,029	$ 616,561
Total Capital Ratio (total capital to risk weighted assets) Actual Ratio	13.049%	10.769%
Total Capital Ratio (total capital to risk weighted assets) For Capital Adequacy Purposes Amount	$ 589,081	$ 493,807
Total Capital Ratio (total capital to risk weighted assets) For Capital Adequacy Purposes Ratio	9.25%	8.625%
Total Capital Ratio (total capital to risk weighted assets) To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	$ 636,845	$ 572,530
Total Capital Ratio (total capital to risk weighted assets) To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio	10.00%	10.00%

Common Equity Tier 1 Risk Based Capital as defined in the regulations.

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Common equity tier one risk based capital required for capital adequacy to risk weighted assets.

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Common equity tier one risk based capital required to be well capitalized.

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Common Equity Tier 1 capital divided by risk weighted assets as defined by regulations.

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The amount of total capital as defined in the regulations.

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The minimum amount of Total Capital required for capital adequacy purposes under the regulatory framework for prompt corrective action.

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The amount of Total Capital required to be categorized as well as capitalized under the regulatory framework for prompt corrective action.

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Total Capital divided by risk weighted assets as defined in the regulations.

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Tier 1 Leverage Capital as defined in the regulations. Also called Core Capital.

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Tier 1 Leverage Capital divided by average assets as defined in the regulations.

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Tier 1 Risk Based Capital as defined in the regulations.

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Tier 1 capital divided by risk weighted assets as defined by regulations.

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