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Loans and Leases - Impaired Loans (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related allowance, Recorded Investment $ 34,754 $ 42,169
Impaired loans with an allowance recorded, Recorded Investment 1,938 1,746
Impaired loans with no related allowance, Unpaid Principal Balance 38,022 45,278
Impaired loans with an allowance recorded, Unpaid Principal Balance 1,940 1,868
Total impaired loans, Recorded Investment 36,692  
Total impaired loans, Unpaid Principal Balance 39,962 47,146
Impaired Financing Receivable, Related Allowance 131 235
Commercial, Financial and Agricultural [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related allowance, Recorded Investment 9,629 10,911
Impaired loans with an allowance recorded, Recorded Investment 165 166
Impaired loans with no related allowance, Unpaid Principal Balance 10,947 12,561
Impaired loans with an allowance recorded, Unpaid Principal Balance 166 166
Total impaired loans, Recorded Investment 9,794 11,077
Total impaired loans, Unpaid Principal Balance 11,113 12,727
Impaired Financing Receivable, Related Allowance 10 19
Real Estate-Commercial [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related allowance, Recorded Investment 19,164 24,469
Impaired loans with an allowance recorded, Recorded Investment 1,206 597
Impaired loans with no related allowance, Unpaid Principal Balance 20,029 25,342
Impaired loans with an allowance recorded, Unpaid Principal Balance 1,206 597
Total impaired loans, Recorded Investment 20,370 25,066
Total impaired loans, Unpaid Principal Balance 21,235 25,939
Impaired Financing Receivable, Related Allowance 59 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 4,655 5,704
Impaired loans with an allowance recorded, Recorded Investment 541 983
Impaired loans with no related allowance, Unpaid Principal Balance 5,673 6,253
Impaired loans with an allowance recorded, Unpaid Principal Balance 542 1,105
Total impaired loans, Recorded Investment 5,196 6,687
Total impaired loans, Unpaid Principal Balance 6,215 7,358
Impaired Financing Receivable, Related Allowance 37 191
Real Estate Residential Secured For Personal Purpose [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related allowance, Recorded Investment 703 560
Impaired loans with an allowance recorded, Recorded Investment 26 0
Impaired loans with no related allowance, Unpaid Principal Balance 764 594
Impaired loans with an allowance recorded, Unpaid Principal Balance 26 0
Total impaired loans, Recorded Investment 729 560
Total impaired loans, Unpaid Principal Balance 790 594
Impaired Financing Receivable, Related Allowance 25 0
Real Estate-Home Equity Secured for Personal Purpose [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related allowance, Recorded Investment 238 525
Impaired loans with no related allowance, Unpaid Principal Balance 244 528
Total impaired loans, Recorded Investment 238 525
Total impaired loans, Unpaid Principal Balance 244 528
Impaired Financing Receivable, Related Allowance $ 0 $ 0