Non Purchased Loans - Investment and Interest Income Recognized on Impaired Loans (Details) - Non purchased loans and leases - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Investment and interest income recognized on impaired loans
Average Recorded Investment	$ 16,353	$ 25,726	$ 16,644	$ 26,148
Interest Income Recognized	104	273	274	397
Commercial, financial, agricultural
Investment and interest income recognized on impaired loans
Average Recorded Investment	2,663	1,873	2,653	2,187
Interest Income Recognized	8	0	19	0
Lease financing
Investment and interest income recognized on impaired loans
Average Recorded Investment	335	0	335	0
Interest Income Recognized	0	0	0	0
Real estate – construction
Investment and interest income recognized on impaired loans
Average Recorded Investment	0	295	0	268
Interest Income Recognized	0	6	0	6
Real estate – 1-4 family mortgage
Investment and interest income recognized on impaired loans
Average Recorded Investment	7,442	8,911	7,507	8,892
Interest Income Recognized	57	89	123	110
Real estate – commercial mortgage
Investment and interest income recognized on impaired loans
Average Recorded Investment	5,807	14,487	6,041	14,635
Interest Income Recognized	38	176	130	279
Installment loans to individuals
Investment and interest income recognized on impaired loans
Average Recorded Investment	106	160	108	166
Interest Income Recognized	$ 1	$ 2	$ 2	$ 2