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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, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Financing Receivable, Impaired [Line Items]        
Average Recorded Investment $ 51,822 $ 52,747 $ 53,319 $ 54,340
Interest Income Recognized 461 435 952 902
Additional Interest Income That Would Have Been Recognized Under Original Terms 310 280 589 598
Interest income, cash basis for nonaccrual loans 18 0 22 23
Interest income, accrual method 443 435 930 879
Loans Held For Sale [Member]        
Financing Receivable, Impaired [Line Items]        
Average Recorded Investment 83 0 47 0
Interest Income Recognized 0 0 0 0
Additional Interest Income That Would Have Been Recognized Under Original Terms 1 0 1 0
Commercial, Financial and Agricultural [Member]        
Financing Receivable, Impaired [Line Items]        
Average Recorded Investment 15,669 13,296 15,990 13,794
Interest Income Recognized 116 124 258 251
Additional Interest Income That Would Have Been Recognized Under Original Terms 99 51 186 116
Real Estate-Commercial [Member]        
Financing Receivable, Impaired [Line Items]        
Average Recorded Investment 26,093 23,666 27,450 24,884
Interest Income Recognized 306 253 626 535
Additional Interest Income That Would Have Been Recognized Under Original Terms 82 72 165 166
Real Estate-Construction [Member]        
Financing Receivable, Impaired [Line Items]        
Average Recorded Investment 5,621 12,357 5,688 12,412
Interest Income Recognized 0 41 0 83
Additional Interest Income That Would Have Been Recognized Under Original Terms 76 123 153 247
Real Estate-Residential Secured for Business Purpose [Member]        
Financing Receivable, Impaired [Line Items]        
Average Recorded Investment 3,385 2,574 3,291 2,272
Interest Income Recognized 39 17 68 33
Additional Interest Income That Would Have Been Recognized Under Original Terms 38 15 54 35
Real Estate-Residential Secured for Personal Purpose [Member]        
Financing Receivable, Impaired [Line Items]        
Average Recorded Investment 796 762 674 888
Interest Income Recognized 0 0 0 0
Additional Interest Income That Would Have Been Recognized Under Original Terms 11 18 24 32
Real Estate-Home Equity Secured for Personal Purpose [Member]        
Financing Receivable, Impaired [Line Items]        
Average Recorded Investment 175 90 179 84
Interest Income Recognized 0 0 0 0
Additional Interest Income That Would Have Been Recognized Under Original Terms 3 1 6 2
Loans to Individuals [Member]        
Financing Receivable, Impaired [Line Items]        
Average Recorded Investment 0 2 0 6
Interest Income Recognized 0 0 0 0
Additional Interest Income That Would Have Been Recognized Under Original Terms $ 0 $ 0 $ 0 $ 0