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, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Investment and interest income recognized on impaired loans
Average Recorded Investment	$ 31,335	$ 16,353	$ 31,427	$ 16,644
Interest Income Recognized	204	104	414	274
Commercial, financial, agricultural
Investment and interest income recognized on impaired loans
Average Recorded Investment	5,746	2,663	5,773	2,653
Interest Income Recognized	9	8	18	19
Lease financing
Investment and interest income recognized on impaired loans
Average Recorded Investment	88	335	87	335
Interest Income Recognized	0	0	0	0
Real estate – construction
Investment and interest income recognized on impaired loans
Average Recorded Investment	9,015	0	8,986	0
Interest Income Recognized	105	0	210	0
Real estate – 1-4 family mortgage
Investment and interest income recognized on impaired loans
Average Recorded Investment	10,584	7,442	10,640	7,507
Interest Income Recognized	51	57	103	123
Real estate – commercial mortgage
Investment and interest income recognized on impaired loans
Average Recorded Investment	5,812	5,807	5,851	6,041
Interest Income Recognized	38	38	81	130
Installment loans to individuals
Investment and interest income recognized on impaired loans
Average Recorded Investment	90	106	90	108
Interest Income Recognized	$ 1	$ 1	$ 2	$ 2