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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 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Financing Receivable, Impaired [Line Items]        
Average Recorded Investment $ 33,252 $ 37,758 $ 30,978 $ 39,495
Interest Income Recognized 57 270 275 565
Additional Interest Income That Would Have Been Recognized Under Original Terms 489 258 898 473
Interest income, cash basis for nonaccrual loans 2 3 8 4
Interest income, accrual method 55 267 267 561
Commercial, Financial and Agricultural [Member]        
Financing Receivable, Impaired [Line Items]        
Average Recorded Investment 6,394 11,470 7,090 11,506
Interest Income Recognized 32 64 72 110
Additional Interest Income That Would Have Been Recognized Under Original Terms 134 86 211 171
Real Estate-Commercial [Member]        
Financing Receivable, Impaired [Line Items]        
Average Recorded Investment 22,914 20,777 20,105 22,464
Interest Income Recognized 18 184 190 417
Additional Interest Income That Would Have Been Recognized Under Original Terms 265 81 552 154
Real Estate-Construction [Member]        
Financing Receivable, Impaired [Line Items]        
Average Recorded Investment 56 274 137 156
Interest Income Recognized 0 0 0 0
Additional Interest Income That Would Have Been Recognized Under Original Terms 3 10 5 10
Real Estate-Residential Secured for Business Purpose [Member]        
Financing Receivable, Impaired [Line Items]        
Average Recorded Investment 1,966 4,184 2,107 4,302
Interest Income Recognized 5 21 10 37
Additional Interest Income That Would Have Been Recognized Under Original Terms 23 61 47 105
Real Estate Residential Secured For Personal Purpose [Member]        
Financing Receivable, Impaired [Line Items]        
Average Recorded Investment 889 699 720 636
Interest Income Recognized 2 1 3 1
Additional Interest Income That Would Have Been Recognized Under Original Terms 33 15 44 23
Real Estate-Home Equity Secured for Personal Purpose [Member]        
Financing Receivable, Impaired [Line Items]        
Average Recorded Investment 1,033 354 819 431
Interest Income Recognized 0 0 0 0
Additional Interest Income That Would Have Been Recognized Under Original Terms $ 31 $ 5 $ 39 $ 10