Non Purchased Loans - Restructured Loans by Class (Details) - Non-Purchased $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($) loan	Dec. 31, 2017 USD ($) loan	Dec. 31, 2016 USD ($) loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans (loans) | loan	11	14	12
Pre-Modification Outstanding Recorded Investment	$ 1,858	$ 1,616	$ 1,698
Post-Modification Outstanding Recorded Investment	$ 1,852	$ 1,232	$ 1,685
Commercial, financial, agricultural
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans (loans) | loan	0	2	0
Pre-Modification Outstanding Recorded Investment	$ 0	$ 331	$ 0
Post-Modification Outstanding Recorded Investment	$ 0	$ 330	$ 0
Lease financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans (loans) | loan	0	0	0
Pre-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 0
Post-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 0
Real estate – construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans (loans) | loan	0	0	1
Pre-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 510
Post-Modification Outstanding Recorded Investment	$ 0	$ 0	$ 518
Real estate – 1-4 family mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans (loans) | loan	9	8	11
Pre-Modification Outstanding Recorded Investment	$ 1,764	$ 598	$ 1,188
Post-Modification Outstanding Recorded Investment	$ 1,763	$ 586	$ 1,167
Real estate – commercial mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans (loans) | loan	2	3	0
Pre-Modification Outstanding Recorded Investment	$ 94	$ 683	$ 0
Post-Modification Outstanding Recorded Investment	$ 89	$ 313	$ 0
Installment loans to individuals
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Loans (loans) | loan	0	1	0
Pre-Modification Outstanding Recorded Investment	$ 0	$ 4	$ 0
Post-Modification Outstanding Recorded Investment	$ 0	$ 3	$ 0