Regulatory Matters - Company's and Bank's Actual Capital Amounts and Ratios (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Consolidated [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total Capital to Risk Weighted Assets Actual Amount	$ 373,310	$ 353,777
Total Capital to Risk Weighted Assets Actual Ratio	13.42%	15.32%
Total Capital to Risk Weighted Assets For Capital Adequacy Purposes Amount	222,557	184,784
Total Capital to Risk Weighted Assets For Capital Adequacy Purposes Ratio	8.00%	8.00%
Tier I Capital to Risk Weighted Assets Actual Amount	352,153	331,400
Tier I Capital to Risk Weighted Assets Actual Ratio	12.66%	14.35%
Tier I Capital to Risk Weighted Assets For Capital Adequacy Purposes Amount	111,279	92,392
Tier I Capital to Risk Weighted Assets For Capital Adequacy Purposes Ratio	4.00%	4.00%
Tier I Capital to Average Assets Actual Amount	352,153	331,400
Tier I Capital to Average Assets Actual Ratio	8.94%	11.33%
Tier I Capital to Average Assets For Capital Adequacy Purposes Amount	157,574	117,025
Tier I Capital to Average Assets For Capital Adequacy Purposes Ratio	4.00%	4.00%
Ameris Bank [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total Capital to Risk Weighted Assets Actual Amount	414,356	369,387
Total Capital to Risk Weighted Assets Actual Ratio	14.90%	16.03%
Total Capital to Risk Weighted Assets For Capital Adequacy Purposes Amount	222,528	184,349
Total Capital to Risk Weighted Assets For Capital Adequacy Purposes Ratio	8.00%	8.00%
Total Capital to Risk Weighted Assets To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	278,160	230,437
Total Capital to Risk Weighted Assets To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio	10.00%	10.00%
Tier I Capital to Risk Weighted Assets Actual Amount	393,199	347,010
Tier I Capital to Risk Weighted Assets Actual Ratio	14.14%	15.06%
Tier I Capital to Risk Weighted Assets For Capital Adequacy Purposes Amount	111,264	92,175
Tier I Capital to Risk Weighted Assets For Capital Adequacy Purposes Ratio	4.00%	4.00%
Tier I Capital to Risk Weighted Assets To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	166,896	138,262
Tier I Capital to Risk Weighted Assets To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio	6.00%	6.00%
Tier I Capital to Average Assets Actual Amount	393,199	347,010
Tier I Capital to Average Assets Actual Ratio	10.01%	11.93%
Tier I Capital to Average Assets For Capital Adequacy Purposes Amount	157,165	116,372
Tier I Capital to Average Assets For Capital Adequacy Purposes Ratio	4.00%	4.00%
Tier I Capital to Average Assets To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	$ 196,456	$ 145,465
Tier I Capital to Average Assets To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio	5.00%	5.00%