Loans and the Allowance for Loan Losses - (Details 8) - Receivables Acquired with Deteriorated Credit Quality - USD ($) $ in Thousands		Mar. 31, 2016	Dec. 31, 2015
Loans acquired with deteriorated credit quality
Total		$ 325,009	$ 336,165
Covered Loans
Loans acquired with deteriorated credit quality
Total		30,644	66,973
Not Covered Loans
Loans acquired with deteriorated credit quality
Total		294,365	269,192
Commercial, financial, agricultural
Loans acquired with deteriorated credit quality
Total		14,450	16,489
Commercial, financial, agricultural | Covered Loans
Loans acquired with deteriorated credit quality
Total		232	1,759
Commercial, financial, agricultural | Not Covered Loans
Loans acquired with deteriorated credit quality
Total		14,218	14,730
Lease financing
Loans acquired with deteriorated credit quality
Total		0	0
Lease financing | Covered Loans
Loans acquired with deteriorated credit quality
Total		0	0
Lease financing | Not Covered Loans
Loans acquired with deteriorated credit quality
Total		0	0
Real estate – construction
Loans acquired with deteriorated credit quality
Total		2,504	2,749
Real estate – construction | Covered Loans
Loans acquired with deteriorated credit quality
Total		85	91
Real estate – construction | Not Covered Loans
Loans acquired with deteriorated credit quality
Total		2,419	2,658
Real estate – 1-4 family mortgage
Loans acquired with deteriorated credit quality
Total		88,964	91,649
Real estate – 1-4 family mortgage | Covered Loans
Loans acquired with deteriorated credit quality
Total		26,612	31,354
Real estate – 1-4 family mortgage | Not Covered Loans
Loans acquired with deteriorated credit quality
Total		62,352	60,295
Real estate – commercial mortgage
Loans acquired with deteriorated credit quality
Total		216,589	222,610
Real estate – commercial mortgage | Covered Loans
Loans acquired with deteriorated credit quality
Total		3,679	33,726
Real estate – commercial mortgage | Not Covered Loans
Loans acquired with deteriorated credit quality
Total		212,910	188,884
Installment loans to individuals
Loans acquired with deteriorated credit quality
Total	[1]	2,502	2,668
Installment loans to individuals | Covered Loans
Loans acquired with deteriorated credit quality
Total		36	43
Installment loans to individuals | Not Covered Loans
Loans acquired with deteriorated credit quality
Total		$ 2,466	$ 2,625

[1] Includes lease financing receivables.