Condensed Financial Information of Ameris Bancorp (Parent Company Only) - Condensed Statements of Income (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income
Total interest income	$ 44,900	$ 43,186	$ 38,607	$ 37,873	$ 31,749	$ 31,749	$ 31,951	$ 30,873	$ 164,566	$ 126,322	$ 129,479
Expense
Interest	3,894	4,054	3,343	3,389	2,698	2,429	2,475	2,535	14,680	10,137	15,074
Other expense									21,274	18,580	14,935
Total noninterest expense	41,666	38,028	34,446	32,789	33,274	28,237	26,688	28,884	150,869	121,945	119,470
Earnings (loss) before income tax benefit and dividends received in excess of earnings of subsidiaries and equity in undistributed income (loss) of subsidiaries	14,747	16,785	12,400	12,273	1,466	9,939	10,007	7,891	56,205	29,303	21,720
Income tax benefit	(4,167)	(5,122)	(4,270)	(3,923)	(88)	(3,262)	(3,329)	(2,606)	(17,482)	(9,285)	(7,285)
Net income	10,580	11,663	8,130	8,350	1,378	6,677	6,678	5,285	38,723	20,018	14,435
Preferred stock dividend				(286)	(412)	(443)	(442)	(441)	(286)	(1,738)	(3,577)
Net income available to common stockholders	10,580	11,663	8,130	8,064	966	6,234	6,236	4,844	38,437	18,280	10,858
Parent Company [Member]
Income
Dividends from subsidiaries									29,000	2,200	29,000
Gain on sale of securities											214
Other income									235	26	106
Total interest income									29,235	2,226	29,320
Expense
Interest									4,558	1,527	1,489
Other expense									2,253	1,133	1,545
Total noninterest expense									6,811	2,660	3,034
Earnings (loss) before income tax benefit and dividends received in excess of earnings of subsidiaries and equity in undistributed income (loss) of subsidiaries									22,424	(434)	26,286
Income tax benefit									2,468	921	921
Earnings (loss) before dividends received in excess of earnings of subsidiaries and equity in undistributed income of subsidiaries									24,892	487	27,207
Dividends received in excess of earnings of subsidiaries											(12,772)
Equity in undistributed income of subsidiaries									13,831	19,531
Net income									38,723	20,018	14,435
Preferred stock dividend									286	1,738	3,577
Net income available to common stockholders									$ 38,437	$ 18,280	$ 10,858