FDIC Indemnification Asset (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Receivable from FDIC for Loss Share Agreements
Balance at the beginning of the period	$ 262,651,000	$ 212,103,000
Increase (decrease) in expected losses on loans	78,000	30,039,000
Additional losses on OREO	7,467,000	20,109,000
Reimbursable expenses	9,262,000	13,300,000
Amortization of discounts and premiums, net	(20,773,000)	(10,135,000)
Balance at the end of the period	146,171,000	262,651,000
Cash received from loss share claims filed, including reimbursable expenses	112,514,000	140,936,000
Projected shortfall in cash flows related to FDIC indemnification asset for losses on assets acquired	46,400,000
Subsequent Event
Receivable from FDIC for Loss Share Agreements
Cash received from loss share claims filed, including reimbursable expenses	15,200,000
Habersham
Receivable from FDIC for Loss Share Agreements
FDIC indemnification asset recorded		87,418,000
BankMeridian
Receivable from FDIC for Loss Share Agreements
FDIC indemnification asset recorded		50,753,000
Estimated "true-up" payment to the FDIC at the end of the loss share agreement	$ 3,300,000
FDIC Indemnification Asset True-up Period	10 years