Non Purchased Loans - Investment and Interest Income Recognized on Impaired Loans (Details) - Non purchased loans and leases - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Investment and interest income recognized on impaired loans
Average Recorded Investment	$ 19,469	$ 29,842	$ 19,937	$ 30,654
Interest Income Recognized	159	192	345	590
Commercial, financial, agricultural
Investment and interest income recognized on impaired loans
Average Recorded Investment	1,960	1,841	2,140	1,762
Interest Income Recognized	8	22	8	42
Real estate – construction
Investment and interest income recognized on impaired loans
Average Recorded Investment	897	862	861	671
Interest Income Recognized	33	26	36	27
Real estate – 1-4 family mortgage
Investment and interest income recognized on impaired loans
Average Recorded Investment	8,897	16,119	8,944	16,354
Interest Income Recognized	71	97	165	283
Real estate – commercial mortgage
Investment and interest income recognized on impaired loans
Average Recorded Investment	7,575	10,953	7,844	11,800
Interest Income Recognized	46	46	134	236
Installment loans to individuals
Investment and interest income recognized on impaired loans
Average Recorded Investment	140	67	148	67
Interest Income Recognized	$ 1	$ 1	$ 2	$ 2