Loans and the Allowance for Loan Losses - (Details 2) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Impaired loans
Unpaid Contractual Principal Balance	$ 37,456	$ 42,470
Recorded Investment With Allowance	32,331	36,615
Recorded Investment With No Allowance	167	12
Total Recorded Investment	32,498	36,627
Related Allowance	7,619	7,600
Receivables Acquired with Deteriorated Credit Quality
Impaired loans
Unpaid Contractual Principal Balance	402,524	430,511
Recorded Investment With Allowance	80,112	75,061
Recorded Investment With No Allowance	237,847	261,104
Total Recorded Investment	317,959	336,165
Related Allowance	2,172	1,706
Commercial, financial, agricultural
Impaired loans
Unpaid Contractual Principal Balance	1,306	1,308
Recorded Investment With Allowance	1,295	358
Recorded Investment With No Allowance	0	12
Total Recorded Investment	1,295	370
Related Allowance	164	6
Commercial, financial, agricultural | Receivables Acquired with Deteriorated Credit Quality
Impaired loans
Unpaid Contractual Principal Balance	23,495	27,049
Recorded Investment With Allowance	4,222	5,197
Recorded Investment With No Allowance	9,199	11,292
Total Recorded Investment	13,421	16,489
Related Allowance	401	353
Lease financing
Impaired loans
Unpaid Contractual Principal Balance	0	0
Recorded Investment With Allowance	0	0
Recorded Investment With No Allowance	0	0
Total Recorded Investment	0	0
Related Allowance	0	0
Lease financing | Receivables Acquired with Deteriorated Credit Quality
Impaired loans
Unpaid Contractual Principal Balance	0	0
Recorded Investment With Allowance	0	0
Recorded Investment With No Allowance	0	0
Total Recorded Investment	0	0
Related Allowance	0	0
Real estate – construction
Impaired loans
Unpaid Contractual Principal Balance	167	2,710
Recorded Investment With Allowance	0	2,698
Recorded Investment With No Allowance	167	0
Total Recorded Investment	167	2,698
Related Allowance	0	20
Real estate – construction | Receivables Acquired with Deteriorated Credit Quality
Impaired loans
Unpaid Contractual Principal Balance	3,587	2,916
Recorded Investment With Allowance	0	0
Recorded Investment With No Allowance	3,157	2,749
Total Recorded Investment	3,157	2,749
Related Allowance	0	0
Real estate – 1-4 family mortgage
Impaired loans
Unpaid Contractual Principal Balance	19,033	18,193
Recorded Investment With Allowance	17,673	16,650
Recorded Investment With No Allowance	0	0
Total Recorded Investment	17,673	16,650
Related Allowance	4,924	4,475
Real estate – 1-4 family mortgage | Receivables Acquired with Deteriorated Credit Quality
Impaired loans
Unpaid Contractual Principal Balance	103,248	109,293
Recorded Investment With Allowance	17,677	15,702
Recorded Investment With No Allowance	68,747	75,947
Total Recorded Investment	86,424	91,649
Related Allowance	344	256
Real estate – commercial mortgage
Impaired loans
Unpaid Contractual Principal Balance	16,872	20,169
Recorded Investment With Allowance	13,285	16,819
Recorded Investment With No Allowance	0	0
Total Recorded Investment	13,285	16,819
Related Allowance	2,531	3,099
Real estate – commercial mortgage | Receivables Acquired with Deteriorated Credit Quality
Impaired loans
Unpaid Contractual Principal Balance	269,205	287,821
Recorded Investment With Allowance	57,800	53,762
Recorded Investment With No Allowance	154,862	168,848
Total Recorded Investment	212,662	222,610
Related Allowance	1,426	1,096
Installment loans to individuals
Impaired loans
Unpaid Contractual Principal Balance	78	90
Recorded Investment With Allowance	78	90
Recorded Investment With No Allowance	0	0
Total Recorded Investment	78	90
Related Allowance	0	0
Installment loans to individuals | Receivables Acquired with Deteriorated Credit Quality
Impaired loans
Unpaid Contractual Principal Balance	2,989	3,432
Recorded Investment With Allowance	413	400
Recorded Investment With No Allowance	1,882	2,268
Total Recorded Investment	2,295	2,668
Related Allowance	$ 1	$ 1