CommunityOne Bancrop (Parent Company) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Assets
Other assets	$ 33,551	$ 26,062
Total Assets	1,985,032	2,151,565
Liabilities and shareholders’ equity
Borrowed funds	135,248	115,030
Shareholders’ equity	80,361	98,445	129,015	(28,837)
Total Liabilities and Shareholders' Equity	1,985,032	2,151,565
Condensed Statements of Operations
Noninterest income	20,414	21,958	21,970
Interest expense	(10,559)	(16,708)	(23,576)
Noninterest expense	(84,481)	(110,206)	(125,040)
Loss from continuing operations, before income taxes	(157)	(41,017)	(130,877)
Income tax expense/(benefit)	1,326	(1,039)	641
Net loss	(1,483)	(40,005)	(137,314)
Preferred stock gain on retirement, net of accretion, and dividends	0	0	44,592
Net loss to common shareholders	(1,483)	(40,005)	(92,722)
Cash flows from operating activities
Net loss	(1,483)	(40,005)	(137,314)
Adjustments to reconcile net income to net cash provided by operating activities:
Net cash (used in)/provided by operating activities	(4,487)	(35,961)	53,732
Cash flows from investing activities
Net cash (used in) provided by investing activities	(23,080)	(63,917)	427,498
Cash flows from financing activities
Issuance of common stock, net of expense	0	6,694	289,571
Net cash used in financing activities	(144,613)	(213,928)	(88,408)
Net (Decrease) Increase in Cash and Cash Equivalents	(172,180)	(313,806)	392,822
Parent Company [Member]
Assets
Cash	637	606	2,808
Investment in subsidiaries	143,683	161,007
Other assets	505	81
Total Assets	144,825	161,694
Liabilities and shareholders’ equity
Accrued liabilities	7,762	6,547
Borrowed funds	56,702	56,702
Shareholders’ equity	80,361	98,445
Total Liabilities and Shareholders' Equity	144,825	161,694
Condensed Statements of Operations
Noninterest income	31	34	32
Interest expense	(1,092)	(1,157)	(1,072)
Noninterest expense	(742)	(970)	(3,351)
Loss from continuing operations, before income taxes	(1,803)	(2,093)	(4,391)
Income tax expense/(benefit)	0	(311)	723
Loss before equity in undistributed net loss of subsidiaries	(1,803)	(1,782)	(5,114)
Equity in undistributed net loss of subsidiaries	(320)	38,223	132,200
Net loss	(1,483)	(40,005)	(137,314)
Preferred stock gain on retirement, net of accretion, and dividends	0	0	44,592
Net loss to common shareholders	(1,483)	(40,005)	(92,722)
Cash flows from operating activities
Net loss	(1,483)	(40,005)	(137,314)
Adjustments to reconcile net income to net cash provided by operating activities:
Equity in undistributed net loss of subsidiaries	(320)	38,223	132,200
Other, net	1,153	503	6,638
Net cash (used in)/provided by operating activities	(650)	(1,279)	1,524
Cash flows from investing activities
Downstream cash investment in subsidiary	0	(6,709)	(287,711)
Net cash (used in) provided by investing activities	0	(6,709)	(287,711)
Cash flows from financing activities
Issuance of common stock, net of expense		6,694	289,571
Cash dividends paid on preferred stock	0	0	(756)
Other	681	(908)	0
Net cash used in financing activities	681	5,786	288,815
Net (Decrease) Increase in Cash and Cash Equivalents	31	(2,202)	2,628
Cash at beginning of period	606	2,808	180
Cash at end of period	$ 637	$ 606	$ 2,808