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Loans and Leases - Average Recorded Investment in Impaired Loans and Leases and Analysis of Interest on Impaired Loans (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Financing Receivable, Impaired [Line Items]    
Average Recorded Investment $ 26,323 $ 31,112
Interest Income Recognized 8 218
Additional Interest Income That Would Have Been Recognized Under Original Terms 377 409
Interest income, cash basis for nonaccrual loans 3 6
Interest income, accrual method 5 212
Commercial, Financial and Agricultural [Member]    
Financing Receivable, Impaired [Line Items]    
Average Recorded Investment 3,650 7,703
Interest Income Recognized 5 40
Additional Interest Income That Would Have Been Recognized Under Original Terms 54 77
Real Estate-Commercial [Member]    
Financing Receivable, Impaired [Line Items]    
Average Recorded Investment 18,245 19,916
Interest Income Recognized 3 172
Additional Interest Income That Would Have Been Recognized Under Original Terms 254 287
Real Estate-Construction [Member]    
Financing Receivable, Impaired [Line Items]    
Average Recorded Investment 106 183
Interest Income Recognized 0 0
Additional Interest Income That Would Have Been Recognized Under Original Terms 1 2
Real Estate-Residential Secured for Business Purpose [Member]    
Financing Receivable, Impaired [Line Items]    
Average Recorded Investment 1,277 2,217
Interest Income Recognized 0 5
Additional Interest Income That Would Have Been Recognized Under Original Terms 20 24
Real Estate Residential Secured For Personal Purpose [Member]    
Financing Receivable, Impaired [Line Items]    
Average Recorded Investment 1,619 544
Interest Income Recognized 0 1
Additional Interest Income That Would Have Been Recognized Under Original Terms 25 11
Real Estate-Home Equity Secured for Personal Purpose [Member]    
Financing Receivable, Impaired [Line Items]    
Average Recorded Investment 1,426 549
Interest Income Recognized 0 0
Additional Interest Income That Would Have Been Recognized Under Original Terms $ 23 $ 8