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Loans and Leases - Impaired Loans (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related allowance, Recorded Investment $ 35,433 $ 42,169
Impaired loans with an allowance recorded, Recorded Investment 1,981 1,746
Impaired loans with no related allowance, Unpaid Principal Balance 38,245 45,278
Impaired loans with an allowance recorded, Unpaid Principal Balance 2,383 1,868
Total impaired loans, Recorded Investment 37,414  
Total impaired loans, Unpaid Principal Balance 40,628 47,146
Impaired Financing Receivable, Related Allowance 399 235
Commercial, Financial and Agricultural [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related allowance, Recorded Investment 9,437 10,911
Impaired loans with an allowance recorded, Recorded Investment 87 166
Impaired loans with no related allowance, Unpaid Principal Balance 10,960 12,561
Impaired loans with an allowance recorded, Unpaid Principal Balance 211 166
Total impaired loans, Recorded Investment 9,524 11,077
Total impaired loans, Unpaid Principal Balance 11,171 12,727
Impaired Financing Receivable, Related Allowance 8 19
Real Estate-Commercial [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related allowance, Recorded Investment 21,062 24,469
Impaired loans with an allowance recorded, Recorded Investment 596 597
Impaired loans with no related allowance, Unpaid Principal Balance 21,906 25,342
Impaired loans with an allowance recorded, Unpaid Principal Balance 596 597
Total impaired loans, Recorded Investment 21,658 25,066
Total impaired loans, Unpaid Principal Balance 22,502 25,939
Impaired Financing Receivable, Related Allowance 26 25
Real Estate-Residential Secured for Business Purpose [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related allowance, Recorded Investment 3,937 5,704
Impaired loans with an allowance recorded, Recorded Investment 1,241 983
Impaired loans with no related allowance, Unpaid Principal Balance 4,338 6,253
Impaired loans with an allowance recorded, Unpaid Principal Balance 1,519 1,105
Total impaired loans, Recorded Investment 5,178 6,687
Total impaired loans, Unpaid Principal Balance 5,857 7,358
Impaired Financing Receivable, Related Allowance 364 191
Real Estate Residential Secured For Personal Purpose [Member]    
Financing Receivable, Impaired [Line Items]    
Impaired loans with no related allowance, Recorded Investment 556 560
Impaired loans with no related allowance, Unpaid Principal Balance 596 594
Total impaired loans, Recorded Investment 556 560
Total impaired loans, Unpaid Principal Balance 596 594
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 441 525
Impaired loans with an allowance recorded, Recorded Investment 57 0
Impaired loans with no related allowance, Unpaid Principal Balance 445 528
Impaired loans with an allowance recorded, Unpaid Principal Balance 57 0
Total impaired loans, Recorded Investment 498 525
Total impaired loans, Unpaid Principal Balance 502 528
Impaired Financing Receivable, Related Allowance $ 1 $ 0