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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, 2016
Mar. 31, 2015
Financing Receivable, Impaired [Line Items]    
Average Recorded Investment $ 47,799 $ 54,898
Interest Income Recognized 402 491
Additional Interest Income That Would Have Been Recognized Under Original Terms 218 279
Interest income, cash basis for nonaccrual loans 7 4
Interest income, accrual method 395 487
Commercial, Financial and Agricultural [Member]    
Financing Receivable, Impaired [Line Items]    
Average Recorded Investment 13,569 16,094
Interest Income Recognized 68 142
Additional Interest Income That Would Have Been Recognized Under Original Terms 95 87
Real Estate-Commercial [Member]    
Financing Receivable, Impaired [Line Items]    
Average Recorded Investment 29,212 29,124
Interest Income Recognized 305 320
Additional Interest Income That Would Have Been Recognized Under Original Terms 70 83
Real Estate-Construction [Member]    
Financing Receivable, Impaired [Line Items]    
Average Recorded Investment 0 5,748
Interest Income Recognized 0 0
Additional Interest Income That Would Have Been Recognized Under Original Terms 0 77
Real Estate-Residential Secured for Business Purpose [Member]    
Financing Receivable, Impaired [Line Items]    
Average Recorded Investment 4,273 3,183
Interest Income Recognized 27 29
Additional Interest Income That Would Have Been Recognized Under Original Terms 47 16
Real Estate-Residential Secured for Personal Purpose [Member]    
Financing Receivable, Impaired [Line Items]    
Average Recorded Investment 568 584
Interest Income Recognized 2 0
Additional Interest Income That Would Have Been Recognized Under Original Terms 4 13
Real Estate-Home Equity Secured for Personal Purpose [Member]    
Financing Receivable, Impaired [Line Items]    
Average Recorded Investment 177 165
Interest Income Recognized 0 0
Additional Interest Income That Would Have Been Recognized Under Original Terms $ 2 $ 3