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Loans and Leases - Impaired Loans (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related allowance, Recorded Investment $ 28,678 $ 42,169
Impaired loans with an allowance recorded, Recorded Investment 1,882 1,746
Impaired loans with no related allowance, Unpaid Principal Balance 32,348 45,278
Impaired loans with an allowance recorded, Unpaid Principal Balance 1,886 1,868
Total impaired loans, Recorded Investment 30,560  
Total impaired loans, Unpaid Principal Balance 34,234 47,146
Impaired Financing Receivable, Related Allowance 88 235
Commercial, Financial and Agricultural [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related allowance, Recorded Investment 7,721 10,911
Impaired loans with an allowance recorded, Recorded Investment 162 166
Impaired loans with no related allowance, Unpaid Principal Balance 9,332 12,561
Impaired loans with an allowance recorded, Unpaid Principal Balance 165 166
Total impaired loans, Recorded Investment 7,883 11,077
Total impaired loans, Unpaid Principal Balance 9,497 12,727
Impaired Financing Receivable, Related Allowance 15 19
Real Estate-Commercial [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related allowance, Recorded Investment 15,727 24,469
Impaired loans with an allowance recorded, Recorded Investment 1,182 597
Impaired loans with no related allowance, Unpaid Principal Balance 16,616 25,342
Impaired loans with an allowance recorded, Unpaid Principal Balance 1,182 597
Total impaired loans, Recorded Investment 16,909 25,066
Total impaired loans, Unpaid Principal Balance 17,798 25,939
Impaired Financing Receivable, Related Allowance 40 25
Real Estate-Construction [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related allowance, Recorded Investment 365 0
Impaired loans with no related allowance, Unpaid Principal Balance 365 0
Total impaired loans, Recorded Investment 365 0
Total impaired loans, Unpaid Principal Balance 365 0
Impaired Financing Receivable, Related Allowance 0 0
Real Estate-Residential Secured for Business Purpose [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related allowance, Recorded Investment 3,933 5,704
Impaired loans with an allowance recorded, Recorded Investment 538 983
Impaired loans with no related allowance, Unpaid Principal Balance 5,040 6,253
Impaired loans with an allowance recorded, Unpaid Principal Balance 539 1,105
Total impaired loans, Recorded Investment 4,471 6,687
Total impaired loans, Unpaid Principal Balance 5,579 7,358
Impaired Financing Receivable, Related Allowance 33 191
Real Estate Residential Secured For Personal Purpose [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related allowance, Recorded Investment 572 560
Impaired loans with no related allowance, Unpaid Principal Balance 628 594
Total impaired loans, Recorded Investment 572 560
Total impaired loans, Unpaid Principal Balance 628 594
Impaired Financing Receivable, Related Allowance 0 0
Real Estate-Home Equity Secured for Personal Purpose [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related allowance, Recorded Investment 360 525
Impaired loans with no related allowance, Unpaid Principal Balance 367 528
Total impaired loans, Recorded Investment 360 525
Total impaired loans, Unpaid Principal Balance 367 528
Impaired Financing Receivable, Related Allowance $ 0 $ 0