Loans and Leases - Impaired Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Financing Receivable, Impaired [Line Items]
Impaired loans with no related reserve, Recorded Investment	$ 10,785	$ 13,174
Impaired loans with a reserve recorded, Recorded Investment	14,317	13,407
Impaired loans with no related reserve, Unpaid Principal Balance	12,715	14,963
Impaired loans with a reserve recorded, Unpaid Principal Balance	15,074	13,985
Total impaired loans, Recorded Investment	25,102	26,581
Total impaired loans, Unpaid Principal Balance	27,789	28,948
Impaired Financing Receivable, Related Reserve	2,439	1,415
Commercial, Financial and Agricultural [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans with no related reserve, Recorded Investment	1,980	2,776
Impaired loans with a reserve recorded, Recorded Investment	170	971
Impaired loans with no related reserve, Unpaid Principal Balance	2,590	3,361
Impaired loans with a reserve recorded, Unpaid Principal Balance	170	1,024
Total impaired loans, Recorded Investment	2,150	3,747
Total impaired loans, Unpaid Principal Balance	2,760	4,385
Impaired Financing Receivable, Related Reserve	99	413
Real Estate-Commercial [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans with no related reserve, Recorded Investment	5,158	6,578
Impaired loans with a reserve recorded, Recorded Investment	12,581	11,637
Impaired loans with no related reserve, Unpaid Principal Balance	6,163	7,516
Impaired loans with a reserve recorded, Unpaid Principal Balance	13,336	12,162
Total impaired loans, Recorded Investment	17,739	18,215
Total impaired loans, Unpaid Principal Balance	19,499	19,678
Impaired Financing Receivable, Related Reserve	1,840	675
Real Estate-Construction [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans with no related reserve, Recorded Investment	106	106
Impaired loans with no related reserve, Unpaid Principal Balance	111	111
Total impaired loans, Recorded Investment	106	106
Total impaired loans, Unpaid Principal Balance	111	111
Impaired Financing Receivable, Related Reserve	0	0
Real Estate-Residential Secured for Business Purpose [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans with no related reserve, Recorded Investment	829	1,478
Impaired loans with a reserve recorded, Recorded Investment	767	0
Impaired loans with no related reserve, Unpaid Principal Balance	1,006	1,660
Impaired loans with a reserve recorded, Unpaid Principal Balance	769	0
Total impaired loans, Recorded Investment	1,596	1,478
Total impaired loans, Unpaid Principal Balance	1,775	1,660
Impaired Financing Receivable, Related Reserve	165	0
Real Estate Residential Secured For Personal Purpose [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans with no related reserve, Recorded Investment	1,443	863
Impaired loans with a reserve recorded, Recorded Investment	724	724
Impaired loans with no related reserve, Unpaid Principal Balance	1,516	911
Impaired loans with a reserve recorded, Unpaid Principal Balance	724	724
Total impaired loans, Recorded Investment	2,167	1,587
Total impaired loans, Unpaid Principal Balance	2,240	1,635
Impaired Financing Receivable, Related Reserve	260	252
Real Estate-Home Equity Secured for Personal Purpose [Member]
Financing Receivable, Impaired [Line Items]
Impaired loans with no related reserve, Recorded Investment	1,269	1,373
Impaired loans with a reserve recorded, Recorded Investment	75	75
Impaired loans with no related reserve, Unpaid Principal Balance	1,329	1,404
Impaired loans with a reserve recorded, Unpaid Principal Balance	75	75
Total impaired loans, Recorded Investment	1,344	1,448
Total impaired loans, Unpaid Principal Balance	1,404	1,479
Impaired Financing Receivable, Related Reserve	$ 75	$ 75