Loans and the Allowance for Loan Losses (Details 8) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013		Dec. 31, 2012
Loans acquired with deteriorated credit quality
Acquired with deteriorated credit quality	$ 212,081		$ 248,029
Impaired Covered Loans [Member]
Loans acquired with deteriorated credit quality
Acquired with deteriorated credit quality	25,370		31,904
Other Covered Loans [Member]
Loans acquired with deteriorated credit quality
Acquired with deteriorated credit quality	176,124		205,184
Not Covered Loans [Member]
Loans acquired with deteriorated credit quality
Acquired with deteriorated credit quality	10,587		10,941
Commercial, financial, agricultural [Member]
Loans acquired with deteriorated credit quality
Acquired with deteriorated credit quality	10,404		11,140
Commercial, financial, agricultural [Member] | Impaired Covered Loans [Member]
Loans acquired with deteriorated credit quality
Acquired with deteriorated credit quality	0		0
Commercial, financial, agricultural [Member] | Other Covered Loans [Member]
Loans acquired with deteriorated credit quality
Acquired with deteriorated credit quality	10,282		10,800
Commercial, financial, agricultural [Member] | Not Covered Loans [Member]
Loans acquired with deteriorated credit quality
Acquired with deteriorated credit quality	122		340
Lease financing [Member]
Loans acquired with deteriorated credit quality
Acquired with deteriorated credit quality	0		0
Lease financing [Member] | Impaired Covered Loans [Member]
Loans acquired with deteriorated credit quality
Acquired with deteriorated credit quality	0		0
Lease financing [Member] | Other Covered Loans [Member]
Loans acquired with deteriorated credit quality
Acquired with deteriorated credit quality	0		0
Lease financing [Member] | Not Covered Loans [Member]
Loans acquired with deteriorated credit quality
Acquired with deteriorated credit quality	0		0
Real estate - construction [Member]
Loans acquired with deteriorated credit quality
Acquired with deteriorated credit quality	1,648		1,648
Real estate - construction [Member] | Impaired Covered Loans [Member]
Loans acquired with deteriorated credit quality
Acquired with deteriorated credit quality	0		0
Real estate - construction [Member] | Other Covered Loans [Member]
Loans acquired with deteriorated credit quality
Acquired with deteriorated credit quality	1,648		1,648
Real estate - construction [Member] | Not Covered Loans [Member]
Loans acquired with deteriorated credit quality
Acquired with deteriorated credit quality	0		0
Real estate - 1-4 family mortgage [Member]
Loans acquired with deteriorated credit quality
Acquired with deteriorated credit quality	62,820		75,147
Real estate - 1-4 family mortgage [Member] | Impaired Covered Loans [Member]
Loans acquired with deteriorated credit quality
Acquired with deteriorated credit quality	1,046		6,122
Real estate - 1-4 family mortgage [Member] | Other Covered Loans [Member]
Loans acquired with deteriorated credit quality
Acquired with deteriorated credit quality	59,364		67,326
Real estate - 1-4 family mortgage [Member] | Not Covered Loans [Member]
Loans acquired with deteriorated credit quality
Acquired with deteriorated credit quality	2,410		1,699
Real estate - commercial mortgage [Member]
Loans acquired with deteriorated credit quality
Acquired with deteriorated credit quality	135,536		157,869
Real estate - commercial mortgage [Member] | Impaired Covered Loans [Member]
Loans acquired with deteriorated credit quality
Acquired with deteriorated credit quality	24,324		25,782
Real estate - commercial mortgage [Member] | Other Covered Loans [Member]
Loans acquired with deteriorated credit quality
Acquired with deteriorated credit quality	104,796		125,379
Real estate - commercial mortgage [Member] | Not Covered Loans [Member]
Loans acquired with deteriorated credit quality
Acquired with deteriorated credit quality	6,416		6,708
Installment loans to individuals [Member]
Loans acquired with deteriorated credit quality
Acquired with deteriorated credit quality	1,673	[1]	2,225	[1]
Installment loans to individuals [Member] | Impaired Covered Loans [Member]
Loans acquired with deteriorated credit quality
Acquired with deteriorated credit quality	0		0
Installment loans to individuals [Member] | Other Covered Loans [Member]
Loans acquired with deteriorated credit quality
Acquired with deteriorated credit quality	34		31
Installment loans to individuals [Member] | Not Covered Loans [Member]
Loans acquired with deteriorated credit quality
Acquired with deteriorated credit quality	$ 1,639		$ 2,194

[1] Includes lease financing receivables.