Loans and the Allowance for Loan Losses - (Details 3) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Investment and interest income recognized on impaired loans
Average Recorded Investment	$ 35,970	$ 38,375	$ 36,708	$ 39,452
Interest Income Recognized	256	307	681	770
Receivables Acquired with Deteriorated Credit Quality
Investment and interest income recognized on impaired loans
Average Recorded Investment	338,176	314,453	337,288	309,914
Interest Income Recognized	3,983	4,882	11,826	12,399
Commercial, financial, agricultural
Investment and interest income recognized on impaired loans
Average Recorded Investment	2,387	1,286	2,233	1,325
Interest Income Recognized	28	7	48	21
Commercial, financial, agricultural | Receivables Acquired with Deteriorated Credit Quality
Investment and interest income recognized on impaired loans
Average Recorded Investment	15,317	12,379	15,768	12,298
Interest Income Recognized	252	189	839	497
Lease financing
Investment and interest income recognized on impaired loans
Average Recorded Investment	0	0	0	0
Interest Income Recognized	0	0	0	0
Lease financing | Receivables Acquired with Deteriorated Credit Quality
Investment and interest income recognized on impaired loans
Average Recorded Investment	0	0	0	0
Interest Income Recognized	0	0	0	0
Real estate – construction
Investment and interest income recognized on impaired loans
Average Recorded Investment	1,010	0	819	0
Interest Income Recognized	26	0	28	0
Real estate – construction | Receivables Acquired with Deteriorated Credit Quality
Investment and interest income recognized on impaired loans
Average Recorded Investment	988	651	991	219
Interest Income Recognized	15	43	48	43
Real estate – 1-4 family mortgage
Investment and interest income recognized on impaired loans
Average Recorded Investment	18,914	16,906	19,146	17,192
Interest Income Recognized	115	99	309	275
Real estate – 1-4 family mortgage | Receivables Acquired with Deteriorated Credit Quality
Investment and interest income recognized on impaired loans
Average Recorded Investment	92,830	78,933	93,900	76,851
Interest Income Recognized	1,056	1,129	3,000	2,974
Real estate – commercial mortgage
Investment and interest income recognized on impaired loans
Average Recorded Investment	13,425	20,112	14,271	20,864
Interest Income Recognized	87	199	294	472
Real estate – commercial mortgage | Receivables Acquired with Deteriorated Credit Quality
Investment and interest income recognized on impaired loans
Average Recorded Investment	226,533	219,229	224,004	217,130
Interest Income Recognized	2,635	3,487	7,859	8,779
Installment loans to individuals
Investment and interest income recognized on impaired loans
Average Recorded Investment	234	71	239	71
Interest Income Recognized	0	2	2	2
Installment loans to individuals | Receivables Acquired with Deteriorated Credit Quality
Investment and interest income recognized on impaired loans
Average Recorded Investment	2,508	3,261	2,625	3,416
Interest Income Recognized	$ 25	$ 34	$ 80	$ 106