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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, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Financing Receivable, Impaired [Line Items]        
Average Recorded Investment $ 37,758 $ 45,641 $ 39,495 $ 46,755
Interest Income Recognized 270 364 565 766
Additional Interest Income That Would Have Been Recognized Under Original Terms 258 210 473 428
Interest income, cash basis for nonaccrual loans 3 0 4 7
Interest income, accrual method 268 364 561 759
Commercial, Financial and Agricultural [Member]        
Financing Receivable, Impaired [Line Items]        
Average Recorded Investment 11,470 13,387 11,506 13,421
Interest Income Recognized 64 74 110 142
Additional Interest Income That Would Have Been Recognized Under Original Terms 86 78 171 173
Real Estate-Commercial [Member]        
Financing Receivable, Impaired [Line Items]        
Average Recorded Investment 20,777 27,691 22,464 28,389
Interest Income Recognized 184 281 417 586
Additional Interest Income That Would Have Been Recognized Under Original Terms 81 58 154 128
Real Estate-Construction [Member]        
Financing Receivable, Impaired [Line Items]        
Average Recorded Investment 274 0 156 0
Interest Income Recognized 0 0 0 0
Additional Interest Income That Would Have Been Recognized Under Original Terms 10 0 10 0
Real Estate-Residential Secured for Business Purpose [Member]        
Financing Receivable, Impaired [Line Items]        
Average Recorded Investment 4,184 3,740 4,302 4,120
Interest Income Recognized 21 9 37 36
Additional Interest Income That Would Have Been Recognized Under Original Terms 61 60 105 107
Real Estate Residential Secured For Personal Purpose [Member]        
Financing Receivable, Impaired [Line Items]        
Average Recorded Investment 699 392 636 496
Interest Income Recognized 1 0 1 2
Additional Interest Income That Would Have Been Recognized Under Original Terms 15 5 23 9
Real Estate-Home Equity Secured for Personal Purpose [Member]        
Financing Receivable, Impaired [Line Items]        
Average Recorded Investment 354 431 431 329
Interest Income Recognized 0 0 0 0
Additional Interest Income That Would Have Been Recognized Under Original Terms $ 5 $ 9 $ 10 $ 11