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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, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Financing Receivable, Impaired [Line Items]        
Average recorded investment $ 27,865 $ 30,858 $ 26,775 $ 30,760
Interest income recognized 0 57 21 332
Additional interest income that would have been recognized under original terms 460 400 1,215 1,298
Interest income, cash basis for nonaccrual loans 0 5 15 13
Interest income, accrual method 0 52 6 319
Commercial, Financial and Agricultural [Member]        
Financing Receivable, Impaired [Line Items]        
Average recorded investment 2,082 5,671 2,764 6,589
Interest income recognized 0 31 17 103
Additional interest income that would have been recognized under original terms 43 58 146 269
Real Estate-Commercial [Member]        
Financing Receivable, Impaired [Line Items]        
Average recorded investment 19,818 19,878 18,839 19,935
Interest income recognized 0 22 3 212
Additional interest income that would have been recognized under original terms 284 261 780 813
Real Estate-Construction [Member]        
Financing Receivable, Impaired [Line Items]        
Average recorded investment 219 108 151 128
Interest income recognized 0 0 0 0
Additional interest income that would have been recognized under original terms 8 2 11 7
Real Estate-Residential Secured For Business Purpose [Member]        
Financing Receivable, Impaired [Line Items]        
Average recorded investment 2,248 1,844 1,750 2,018
Interest income recognized 0 4 0 14
Additional interest income that would have been recognized under original terms 76 32 132 79
Real Estate-Residential Secured For Personal Purpose [Member]        
Financing Receivable, Impaired [Line Items]        
Average recorded investment 2,185 1,850 1,907 1,064
Interest income recognized 0 0 0 3
Additional interest income that would have been recognized under original terms 30 26 84 70
Real Estate-Home Equity Secured For Personal Purpose [Member]        
Financing Receivable, Impaired [Line Items]        
Average recorded investment 1,313 1,507 1,364 1,026
Interest income recognized 0 0 1 0
Additional interest income that would have been recognized under original terms $ 19 $ 21 $ 62 $ 60