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Loans (Composition Of Loan Portfolio By Class Of Loan) (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2016 | Mar. 31, 2015 | Dec. 31, 2015
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Impaired Financing Receivable, Recorded Investment |  | $ 78,171 | $ 70,492 | $ 80,664
Loan balance |  | 5,062,185 |  | 5,068,085
Accrued interest receivable |  | 17,415 |  | 18,675
Recorded Investment |  | 5,076,385 |  | 5,082,324
Impaired Financing Receivable, Average Recorded Investment |  | 78,669 | 72,000 |
Impaired Financing Receivable, Interest Income, Cash Basis Method |  | 2,396 | 562 |
Commercial Financial And Agricultural [Member] |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Impaired Financing Receivable, Recorded Investment |  | 28,596 | 20,571 |
Impaired Financing Receivable, Average Recorded Investment |  | 29,858 | 19,876 |
Impaired Financing Receivable, Interest Income, Cash Basis Method |  | 238 | 131 |
Construction Real Estate, SEPH Commercial Land and Development [Member] |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Impaired Financing Receivable, Recorded Investment |  | 2,043 | 2,077 |
Loan balance | [1] | 2,043 |  | 2,044
Accrued interest receivable | [1] | 0 |  | 0
Recorded Investment | [1] | 2,043 |  | 2,044
Impaired Financing Receivable, Average Recorded Investment |  | 2,043 | 2,077 |
Impaired Financing Receivable, Interest Income, Cash Basis Method |  | 0 | 8 |
Construction Real Estate - Remaining Commercial [Member] |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Impaired Financing Receivable, Recorded Investment |  | 4,845 | 5,725 |
Loan balance |  | 129,167 |  | 128,046
Accrued interest receivable |  | 321 |  | 321
Recorded Investment |  | 129,488 |  | 128,367
Impaired Financing Receivable, Average Recorded Investment |  | 4,771 | 5,697 |
Impaired Financing Receivable, Interest Income, Cash Basis Method |  | 13 | 5 |
Construction Real Estate - Mortgage [Member] |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Loan balance |  | 37,295 |  | 36,722
Accrued interest receivable |  | 74 |  | 75
Recorded Investment |  | 37,369 |  | 36,797
Construction Real Estate - Installment [Member] |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Loan balance |  | 5,941 |  | 6,533
Accrued interest receivable |  | 20 |  | 21
Recorded Investment |  | 5,961 |  | 6,554
Residential Real Estate - Commercial [Member] |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Impaired Financing Receivable, Recorded Investment |  | 24,619 | 25,219 |
Loan balance |  | 411,314 |  | 410,571
Accrued interest receivable |  | 1,007 |  | 1,014
Recorded Investment |  | 412,321 |  | 411,585
Impaired Financing Receivable, Average Recorded Investment |  | 24,897 | 25,373 |
Impaired Financing Receivable, Interest Income, Cash Basis Method |  | 1,965 | 255 |
Residential Real Estate - Mortgage [Member] |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Loan balance |  | 1,207,396 |  | 1,210,819
Accrued interest receivable |  | 1,733 |  | 1,469
Recorded Investment |  | 1,209,129 |  | 1,212,288
Residential Real Estate - HELOC [Member] |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Loan balance |  | 209,260 |  | 211,415
Accrued interest receivable |  | 784 |  | 769
Recorded Investment |  | 210,044 |  | 212,184
Residential Real Estate - Installment [Member] |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Loan balance |  | 21,734 |  | 22,638
Accrued interest receivable |  | 82 |  | 78
Recorded Investment |  | 21,816 |  | 22,716
Loans Receivable [Member] |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Accrued interest receivable |  | 14,200 |  | 14,239
Commercial Financial And Agricultural [Member] |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Loan balance | [1] | 941,481 |  | 955,727
Accrued interest receivable | [1] | 3,592 |  | 3,437
Recorded Investment | [1] | 945,073 |  | 959,164
Commercial Real Estate [Member] |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Impaired Financing Receivable, Recorded Investment |  | 18,068 | 16,900 |
Loan balance | [1] | 1,114,626 |  | 1,113,603
Accrued interest receivable | [1] | 3,652 |  | 4,009
Recorded Investment | [1] | 1,118,278 |  | 1,117,612
Impaired Financing Receivable, Average Recorded Investment |  | 17,100 | 18,977 |
Impaired Financing Receivable, Interest Income, Cash Basis Method |  | 180 | $ 163 |
Consumer [Member] |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Loan balance |  | 979,111 |  | 967,111
Accrued interest receivable |  | 2,896 |  | 3,032
Recorded Investment |  | 982,007 |  | 970,143
Leases [Member] |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |
Loan balance |  | 2,817 |  | 2,856
Accrued interest receivable |  | 39 |  | 14
Recorded Investment |  | $ 2,856 |  | $ 2,870
[1] | Included within commercial, financial and agricultural loans and commercial real estate loans is an immaterial amount of consumer loans that are not broken out by class.

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