Loans and the Allowance for Loan Losses (Details 8) - Receivables Acquired with Deteriorated Credit Quality - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Sep. 01, 2013
Fair value of loans determined to be impaired and not to be impaired at the time of acquisition
Acquired with deteriorated credit quality	$ 336,165	$ 344,425
Impaired Covered Loans
Fair value of loans determined to be impaired and not to be impaired at the time of acquisition
Acquired with deteriorated credit quality	22,848	8,004
Other Covered Loans
Fair value of loans determined to be impaired and not to be impaired at the time of acquisition
Acquired with deteriorated credit quality	44,125	135,037
Not Covered Loans
Fair value of loans determined to be impaired and not to be impaired at the time of acquisition
Acquired with deteriorated credit quality	269,192	201,384
Contractually-required principal and interest
Fair value of loans determined to be impaired and not to be impaired at the time of acquisition
Acquired with deteriorated credit quality	467,777	477,438
Contractually-required principal and interest | Impaired Covered Loans
Fair value of loans determined to be impaired and not to be impaired at the time of acquisition
Acquired with deteriorated credit quality	24,152	32,451
Contractually-required principal and interest | Other Covered Loans
Fair value of loans determined to be impaired and not to be impaired at the time of acquisition
Acquired with deteriorated credit quality	54,963	163,271
Contractually-required principal and interest | Not Covered Loans
Fair value of loans determined to be impaired and not to be impaired at the time of acquisition
Acquired with deteriorated credit quality	388,662	281,716
Nonaccretable difference
Fair value of loans determined to be impaired and not to be impaired at the time of acquisition
Acquired with deteriorated credit quality	(83,320)	(100,580)
Nonaccretable difference | Impaired Covered Loans
Fair value of loans determined to be impaired and not to be impaired at the time of acquisition
Acquired with deteriorated credit quality	(1,304)	(24,446)
Nonaccretable difference | Other Covered Loans
Fair value of loans determined to be impaired and not to be impaired at the time of acquisition
Acquired with deteriorated credit quality	(7,138)	(25,611)
Nonaccretable difference | Not Covered Loans
Fair value of loans determined to be impaired and not to be impaired at the time of acquisition
Acquired with deteriorated credit quality	(74,878)	(50,523)
Cash flows expected to be collected
Fair value of loans determined to be impaired and not to be impaired at the time of acquisition
Acquired with deteriorated credit quality	384,457	376,858
Cash flows expected to be collected | Impaired Covered Loans
Fair value of loans determined to be impaired and not to be impaired at the time of acquisition
Acquired with deteriorated credit quality	22,848	8,005
Cash flows expected to be collected | Other Covered Loans
Fair value of loans determined to be impaired and not to be impaired at the time of acquisition
Acquired with deteriorated credit quality	47,825	137,660
Cash flows expected to be collected | Not Covered Loans
Fair value of loans determined to be impaired and not to be impaired at the time of acquisition
Acquired with deteriorated credit quality	313,784	231,193
Accretable yield
Fair value of loans determined to be impaired and not to be impaired at the time of acquisition
Acquired with deteriorated credit quality	(48,292)	(32,433)
Accretable yield | Impaired Covered Loans
Fair value of loans determined to be impaired and not to be impaired at the time of acquisition
Acquired with deteriorated credit quality	0	(1)
Accretable yield | Other Covered Loans
Fair value of loans determined to be impaired and not to be impaired at the time of acquisition
Acquired with deteriorated credit quality	(3,700)	(2,623)
Accretable yield | Not Covered Loans
Fair value of loans determined to be impaired and not to be impaired at the time of acquisition
Acquired with deteriorated credit quality	$ (44,592)	$ (29,809)
Heritage Financial Group
Fair value of loans determined to be impaired and not to be impaired at the time of acquisition
Acquired with deteriorated credit quality			$ 1,122,197
Heritage Financial Group | Contractually-required principal and interest
Fair value of loans determined to be impaired and not to be impaired at the time of acquisition
Acquired with deteriorated credit quality			1,205,159
Heritage Financial Group | Nonaccretable difference
Fair value of loans determined to be impaired and not to be impaired at the time of acquisition
Acquired with deteriorated credit quality			14,260
Heritage Financial Group | Cash flows expected to be collected
Fair value of loans determined to be impaired and not to be impaired at the time of acquisition
Acquired with deteriorated credit quality			1,190,899
Heritage Financial Group | Accretable yield
Fair value of loans determined to be impaired and not to be impaired at the time of acquisition
Acquired with deteriorated credit quality			$ 68,702