Condensed Financial Information of Ameris Bancorp (Parent Company Only) - Condensed Balance Sheets (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Assets
Cash and due from banks	$ 78,036	$ 62,955	$ 80,256	$ 65,528
Other assets	77,748	51,663
Total assets	4,037,077	3,667,649	3,019,052
Liabilities
Other liabilities	22,384	18,165
Other borrowings	78,881	194,572
Subordinated deferrable interest debentures	65,325	55,466
Total liabilities	3,671,049	3,350,950
Stockholders' equity	366,028	316,699	279,017
Total liabilities and stockholders' equity	4,037,077	3,667,649
Parent Company [Member]
Assets
Cash and due from banks	868	3,550	1,639	4,200
Investment in subsidiaries	470,557	386,377
Other assets	6,552	6,824
Total assets	477,977	396,751
Liabilities
Other liabilities	7,624	14
Other borrowings	39,000	24,572
Subordinated deferrable interest debentures	65,325	55,466
Total liabilities	111,949	80,052
Stockholders' equity	366,028	316,699
Total liabilities and stockholders' equity	$ 477,977	$ 396,751