Loans and the Allowance for Loan Losses - (Details 3) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Investment and interest income recognized on impaired loans
Average Recorded Investment	$ 33,630	$ 43,617	$ 34,153	$ 44,325
Interest Income Recognized	280	332	477	584
Receivables Acquired with Deteriorated Credit Quality
Investment and interest income recognized on impaired loans
Average Recorded Investment	360,392	319,875	362,348	320,224
Interest Income Recognized	4,341	3,666	8,355	7,858
Commercial, financial, agricultural
Investment and interest income recognized on impaired loans
Average Recorded Investment	1,470	785	1,506	803
Interest Income Recognized	23	7	25	14
Commercial, financial, agricultural | Receivables Acquired with Deteriorated Credit Quality
Investment and interest income recognized on impaired loans
Average Recorded Investment	16,361	12,651	16,872	12,672
Interest Income Recognized	287	81	611	314
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	117	0	58	0
Interest Income Recognized	2	0	2	0
Real estate – construction | Receivables Acquired with Deteriorated Credit Quality
Investment and interest income recognized on impaired loans
Average Recorded Investment	3,562	0	3,572	0
Interest Income Recognized	39	0	65	0
Real estate – 1-4 family mortgage
Investment and interest income recognized on impaired loans
Average Recorded Investment	17,800	17,712	18,049	17,869
Interest Income Recognized	128	140	209	207
Real estate – 1-4 family mortgage | Receivables Acquired with Deteriorated Credit Quality
Investment and interest income recognized on impaired loans
Average Recorded Investment	98,200	81,492	98,874	81,541
Interest Income Recognized	1,083	889	2,030	1,932
Real estate – commercial mortgage
Investment and interest income recognized on impaired loans
Average Recorded Investment	14,164	24,683	14,460	25,212
Interest Income Recognized	126	185	240	363
Real estate – commercial mortgage | Receivables Acquired with Deteriorated Credit Quality
Investment and interest income recognized on impaired loans
Average Recorded Investment	239,564	222,127	240,254	222,403
Interest Income Recognized	2,903	2,664	5,593	5,535
Installment loans to individuals
Investment and interest income recognized on impaired loans
Average Recorded Investment	79	437	80	441
Interest Income Recognized	1	0	1	0
Installment loans to individuals | Receivables Acquired with Deteriorated Credit Quality
Investment and interest income recognized on impaired loans
Average Recorded Investment	2,705	3,605	2,776	3,608
Interest Income Recognized	$ 29	$ 32	$ 56	$ 77