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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, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Financing Receivable, Impaired [Line Items]        
Average Recorded Investment $ 33,661 $ 42,412 $ 37,442 $ 45,290
Interest Income Recognized 270 346 835 1,112
Additional Interest Income That Would Have Been Recognized Under Original Terms 213 213 686 641
Interest income, cash basis for nonaccrual loans 0 0 4 7
Interest income, accrual method 270 346 831 1,105
Commercial, Financial and Agricultural [Member]        
Financing Receivable, Impaired [Line Items]        
Average Recorded Investment 10,211 12,880 11,030 13,233
Interest Income Recognized 52 62 162 204
Additional Interest Income That Would Have Been Recognized Under Original Terms 92 108 263 281
Real Estate-Commercial [Member]        
Financing Receivable, Impaired [Line Items]        
Average Recorded Investment 18,583 25,309 21,120 27,346
Interest Income Recognized 201 273 618 859
Additional Interest Income That Would Have Been Recognized Under Original Terms 69 58 223 186
Real Estate-Construction [Member]        
Financing Receivable, Impaired [Line Items]        
Average Recorded Investment 365 0 219 0
Interest Income Recognized 0 0 0 0
Additional Interest Income That Would Have Been Recognized Under Original Terms 5 0 15 0
Real Estate-Residential Secured for Business Purpose [Member]        
Financing Receivable, Impaired [Line Items]        
Average Recorded Investment 3,579 3,178 4,053 3,818
Interest Income Recognized 16 11 53 47
Additional Interest Income That Would Have Been Recognized Under Original Terms 34 34 139 141
Real Estate Residential Secured For Personal Purpose [Member]        
Financing Receivable, Impaired [Line Items]        
Average Recorded Investment 635 447 629 485
Interest Income Recognized 1 0 2 2
Additional Interest Income That Would Have Been Recognized Under Original Terms 8 6 31 15
Real Estate-Home Equity Secured for Personal Purpose [Member]        
Financing Receivable, Impaired [Line Items]        
Average Recorded Investment 288 598 391 408
Interest Income Recognized 0 0 0 0
Additional Interest Income That Would Have Been Recognized Under Original Terms $ 5 $ 7 $ 15 $ 18