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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 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Financing Receivable, Impaired [Line Items]        
Average Recorded Investment $ 30,858 $ 33,661 $ 30,760 $ 37,442
Interest Income Recognized 57 270 332 835
Additional Interest Income That Would Have Been Recognized Under Original Terms 400 213 1,298 686
Interest income, cash basis for nonaccrual loans 5 0 13 4
Interest income, accrual method 52 270 319 831
Commercial, Financial and Agricultural [Member]        
Financing Receivable, Impaired [Line Items]        
Average Recorded Investment 5,671 10,211 6,589 11,030
Interest Income Recognized 31 52 103 162
Additional Interest Income That Would Have Been Recognized Under Original Terms 58 92 269 263
Real Estate-Commercial [Member]        
Financing Receivable, Impaired [Line Items]        
Average Recorded Investment 19,878 18,583 19,935 21,120
Interest Income Recognized 22 201 212 618
Additional Interest Income That Would Have Been Recognized Under Original Terms 261 69 813 223
Real Estate-Construction [Member]        
Financing Receivable, Impaired [Line Items]        
Average Recorded Investment 108 365 128 219
Interest Income Recognized 0 0 0 0
Additional Interest Income That Would Have Been Recognized Under Original Terms 2 5 7 15
Real Estate-Residential Secured for Business Purpose [Member]        
Financing Receivable, Impaired [Line Items]        
Average Recorded Investment 1,844 3,579 2,018 4,053
Interest Income Recognized 4 16 14 53
Additional Interest Income That Would Have Been Recognized Under Original Terms 32 34 79 139
Real Estate Residential Secured For Personal Purpose [Member]        
Financing Receivable, Impaired [Line Items]        
Average Recorded Investment 1,850 635 1,064 629
Interest Income Recognized 0 1 3 2
Additional Interest Income That Would Have Been Recognized Under Original Terms 26 8 70 31
Real Estate-Home Equity Secured for Personal Purpose [Member]        
Financing Receivable, Impaired [Line Items]        
Average Recorded Investment 1,507 288 1,026 391
Interest Income Recognized 0 0 0 0
Additional Interest Income That Would Have Been Recognized Under Original Terms $ 21 $ 5 $ 60 $ 15