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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
Mar. 31, 2017
Mar. 31, 2016
Financing Receivable, Impaired [Line Items]    
Average Recorded Investment $ 40,712 $ 47,799
Interest Income Recognized 292 402
Additional Interest Income That Would Have Been Recognized Under Original Terms 215 218
Interest income, cash basis for nonaccrual loans 1 7
Interest income, accrual method 291 395
Commercial, Financial and Agricultural [Member]    
Financing Receivable, Impaired [Line Items]    
Average Recorded Investment 11,418 13,569
Interest Income Recognized 43 68
Additional Interest Income That Would Have Been Recognized Under Original Terms 85 95
Real Estate-Commercial [Member]    
Financing Receivable, Impaired [Line Items]    
Average Recorded Investment 23,949 29,212
Interest Income Recognized 233 305
Additional Interest Income That Would Have Been Recognized Under Original Terms 73 70
Real Estate-Residential Secured for Business Purpose [Member]    
Financing Receivable, Impaired [Line Items]    
Average Recorded Investment 4,268 4,273
Interest Income Recognized 16 27
Additional Interest Income That Would Have Been Recognized Under Original Terms 44 47
Real Estate Residential Secured For Personal Purpose [Member]    
Financing Receivable, Impaired [Line Items]    
Average Recorded Investment 552 568
Interest Income Recognized 0 2
Additional Interest Income That Would Have Been Recognized Under Original Terms 8 4
Real Estate-Home Equity Secured for Personal Purpose [Member]    
Financing Receivable, Impaired [Line Items]    
Average Recorded Investment 525 177
Interest Income Recognized 0 0
Additional Interest Income That Would Have Been Recognized Under Original Terms $ 5 $ 2