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Loans And Allowance For Loan Losses (Troubled Debt Restructurings) (Details)
12 Months Ended
Dec. 31, 2017
USD ($)
Contract
Dec. 31, 2016
USD ($)
Contract
Dec. 31, 2015
USD ($)
Contract
Financing Receivable, Modifications [Line Items]      
Number of Contracts | Contract 151 169 262
Post-modification balance for loans modified or renewed $ 36,723,000 $ 52,994,000 $ 80,386,000
Write-down $ 0 $ 0 $ 4,000,000
Total commercial real estate      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | Contract 42 57 66
Post-modification balance for loans modified or renewed $ 6,718,000 $ 16,429,000 $ 56,424,000
Total commercial real estate | Investment properties      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | Contract 1 4 11
Post-modification balance for loans modified or renewed $ 121,000 $ 5,343,000 $ 32,025,000
Total commercial real estate | 1-4 family properties      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | Contract 35 39 43
Post-modification balance for loans modified or renewed $ 4,826,000 $ 6,987,000 $ 22,253,000
Total commercial real estate | Land and development      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | Contract 6 14 12
Post-modification balance for loans modified or renewed $ 1,771,000 $ 4,099,000 $ 2,146,000
Total commercial and industrial      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | Contract 60 72 101
Post-modification balance for loans modified or renewed $ 23,319,000 $ 33,103,000 $ 15,178,000
Total commercial and industrial | Commercial, financial and agricultural      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | Contract 56 63 91
Post-modification balance for loans modified or renewed $ 21,579,000 $ 24,669,000 $ 9,697,000
Total commercial and industrial | Owner-occupied      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | Contract 4 9 10
Post-modification balance for loans modified or renewed $ 1,740,000 $ 8,434,000 $ 5,481,000
Total consumer      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | Contract 49 40 95
Post-modification balance for loans modified or renewed $ 6,686,000 $ 3,462,000 $ 8,784,000
Total consumer | Home equity lines      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | Contract 0 5 53
Post-modification balance for loans modified or renewed $ 0 $ 348,000 $ 5,731,000
Total consumer | Consumer mortgages      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | Contract 11 7 15
Post-modification balance for loans modified or renewed $ 3,729,000 $ 464,000 $ 1,906,000
Total consumer | Credit cards      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | Contract 0 0 0
Post-modification balance for loans modified or renewed $ 0 $ 0 $ 0
Total consumer | Other consumer loans      
Financing Receivable, Modifications [Line Items]      
Number of Contracts | Contract 38 28 27
Post-modification balance for loans modified or renewed $ 2,957,000 $ 2,650,000 $ 1,147,000
Principal Forgiveness      
Financing Receivable, Modifications [Line Items]      
Post-modification balance for loans modified or renewed 0 0 14,852,000
Principal Forgiveness | Total commercial real estate      
Financing Receivable, Modifications [Line Items]      
Post-modification balance for loans modified or renewed 0 0 14,823,000
Principal Forgiveness | Total commercial real estate | Investment properties      
Financing Receivable, Modifications [Line Items]      
Post-modification balance for loans modified or renewed 0 0 0
Principal Forgiveness | Total commercial real estate | 1-4 family properties      
Financing Receivable, Modifications [Line Items]      
Post-modification balance for loans modified or renewed 0 0 14,823,000
Principal Forgiveness | Total commercial real estate | Land and development      
Financing Receivable, Modifications [Line Items]      
Post-modification balance for loans modified or renewed 0 0 0
Principal Forgiveness | Total commercial and industrial      
Financing Receivable, Modifications [Line Items]      
Post-modification balance for loans modified or renewed 0 0 29,000
Principal Forgiveness | Total commercial and industrial | Commercial, financial and agricultural      
Financing Receivable, Modifications [Line Items]      
Post-modification balance for loans modified or renewed 0 0 29,000
Principal Forgiveness | Total commercial and industrial | Owner-occupied      
Financing Receivable, Modifications [Line Items]      
Post-modification balance for loans modified or renewed 0 0 0
Principal Forgiveness | Total consumer      
Financing Receivable, Modifications [Line Items]      
Post-modification balance for loans modified or renewed 0 0 0
Principal Forgiveness | Total consumer | Home equity lines      
Financing Receivable, Modifications [Line Items]      
Post-modification balance for loans modified or renewed 0 0 0
Principal Forgiveness | Total consumer | Consumer mortgages      
Financing Receivable, Modifications [Line Items]      
Post-modification balance for loans modified or renewed 0 0 0
Principal Forgiveness | Total consumer | Credit cards      
Financing Receivable, Modifications [Line Items]      
Post-modification balance for loans modified or renewed 0 0 0
Principal Forgiveness | Total consumer | Other consumer loans      
Financing Receivable, Modifications [Line Items]      
Post-modification balance for loans modified or renewed 0 0 0
Below Market Interest Rate      
Financing Receivable, Modifications [Line Items]      
Post-modification balance for loans modified or renewed 16,575,000 33,749,000 41,222,000
Below Market Interest Rate | Total commercial real estate      
Financing Receivable, Modifications [Line Items]      
Post-modification balance for loans modified or renewed 2,943,000 7,324,000 30,333,000
Below Market Interest Rate | Total commercial real estate | Investment properties      
Financing Receivable, Modifications [Line Items]      
Post-modification balance for loans modified or renewed 0 1,825,000 25,052,000
Below Market Interest Rate | Total commercial real estate | 1-4 family properties      
Financing Receivable, Modifications [Line Items]      
Post-modification balance for loans modified or renewed 2,786,000 5,499,000 4,667,000
Below Market Interest Rate | Total commercial real estate | Land and development      
Financing Receivable, Modifications [Line Items]      
Post-modification balance for loans modified or renewed 157,000 0 614,000
Below Market Interest Rate | Total commercial and industrial      
Financing Receivable, Modifications [Line Items]      
Post-modification balance for loans modified or renewed 9,469,000 25,393,000 6,608,000
Below Market Interest Rate | Total commercial and industrial | Commercial, financial and agricultural      
Financing Receivable, Modifications [Line Items]      
Post-modification balance for loans modified or renewed 9,434,000 17,509,000 3,191,000
Below Market Interest Rate | Total commercial and industrial | Owner-occupied      
Financing Receivable, Modifications [Line Items]      
Post-modification balance for loans modified or renewed 35,000 7,884,000 3,417,000
Below Market Interest Rate | Total consumer      
Financing Receivable, Modifications [Line Items]      
Post-modification balance for loans modified or renewed 4,163,000 1,032,000 4,281,000
Below Market Interest Rate | Total consumer | Home equity lines      
Financing Receivable, Modifications [Line Items]      
Post-modification balance for loans modified or renewed 0 225,000 2,826,000
Below Market Interest Rate | Total consumer | Consumer mortgages      
Financing Receivable, Modifications [Line Items]      
Post-modification balance for loans modified or renewed 2,539,000 413,000 1,011,000
Below Market Interest Rate | Total consumer | Credit cards      
Financing Receivable, Modifications [Line Items]      
Post-modification balance for loans modified or renewed 0 0 0
Below Market Interest Rate | Total consumer | Other consumer loans      
Financing Receivable, Modifications [Line Items]      
Post-modification balance for loans modified or renewed 1,624,000 394,000 444,000
Term Extensions and/or Other Concessions      
Financing Receivable, Modifications [Line Items]      
Post-modification balance for loans modified or renewed 20,148,000 19,245,000 24,312,000
Term Extensions and/or Other Concessions | Total commercial real estate      
Financing Receivable, Modifications [Line Items]      
Post-modification balance for loans modified or renewed 3,775,000 9,105,000 11,268,000
Term Extensions and/or Other Concessions | Total commercial real estate | Investment properties      
Financing Receivable, Modifications [Line Items]      
Post-modification balance for loans modified or renewed 121,000 3,518,000 6,973,000
Term Extensions and/or Other Concessions | Total commercial real estate | 1-4 family properties      
Financing Receivable, Modifications [Line Items]      
Post-modification balance for loans modified or renewed 2,040,000 1,488,000 2,763,000
Term Extensions and/or Other Concessions | Total commercial real estate | Land and development      
Financing Receivable, Modifications [Line Items]      
Post-modification balance for loans modified or renewed 1,614,000 4,099,000 1,532,000
Term Extensions and/or Other Concessions | Total commercial and industrial      
Financing Receivable, Modifications [Line Items]      
Post-modification balance for loans modified or renewed 13,850,000 7,710,000 8,541,000
Term Extensions and/or Other Concessions | Total commercial and industrial | Commercial, financial and agricultural      
Financing Receivable, Modifications [Line Items]      
Post-modification balance for loans modified or renewed 12,145,000 7,160,000 6,477,000
Term Extensions and/or Other Concessions | Total commercial and industrial | Owner-occupied      
Financing Receivable, Modifications [Line Items]      
Post-modification balance for loans modified or renewed 1,705,000 550,000 2,064,000
Term Extensions and/or Other Concessions | Total consumer      
Financing Receivable, Modifications [Line Items]      
Post-modification balance for loans modified or renewed 2,523,000 2,430,000 4,503,000
Term Extensions and/or Other Concessions | Total consumer | Home equity lines      
Financing Receivable, Modifications [Line Items]      
Post-modification balance for loans modified or renewed 0 123,000 2,905,000
Term Extensions and/or Other Concessions | Total consumer | Consumer mortgages      
Financing Receivable, Modifications [Line Items]      
Post-modification balance for loans modified or renewed 1,190,000 51,000 895,000
Term Extensions and/or Other Concessions | Total consumer | Credit cards      
Financing Receivable, Modifications [Line Items]      
Post-modification balance for loans modified or renewed 0 0 0
Term Extensions and/or Other Concessions | Total consumer | Other consumer loans      
Financing Receivable, Modifications [Line Items]      
Post-modification balance for loans modified or renewed $ 1,333,000 $ 2,256,000 $ 703,000