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Loans (Recorded Investment By Loan Grade) (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Recorded Investment |  | $ 5,324,974 |  | $ 5,372,483 |
Construction Real Estate Commercial [Domain] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Recorded Investment |  | 136,058 |  | 125,389 |
Residential Real Estate - Commercial [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Recorded Investment |  | 390,651 |  | 393,094 |
Commercial Real Estate [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Recorded Investment | [1] | 1,150,845 |  | 1,167,607 |
Leases [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Recorded Investment |  | 2,667 |  | 2,993 |
5 Rated [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Total ending loan balance, recorded investment |  | 4,593 |  | 23,088 |
5 Rated [Member] | Construction Real Estate Commercial [Domain] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Total ending loan balance, recorded investment |  | 21 |  | 278 |
5 Rated [Member] | Residential Real Estate - Commercial [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Total ending loan balance, recorded investment |  | 317 |  | 216 |
5 Rated [Member] | Commercial, Financial, and Agricultural [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Total ending loan balance, recorded investment |  | 1,195 | [2] | 17,272 | [3]
5 Rated [Member] | Commercial Real Estate [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Total ending loan balance, recorded investment |  | 3,060 | [2] | 5,322 | [3]
5 Rated [Member] | Leases [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Total ending loan balance, recorded investment |  | 0 |  | 0 |
6 Rated [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Total ending loan balance, recorded investment |  | 103 |  | 611 |
6 Rated [Member] | Construction Real Estate Commercial [Domain] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Total ending loan balance, recorded investment |  |  |  | 0 |
6 Rated [Member] | Residential Real Estate - Commercial [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Total ending loan balance, recorded investment |  | 46 |  | 1 |
6 Rated [Member] | Commercial, Financial, and Agricultural [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Total ending loan balance, recorded investment |  | 57 | [2] | 153 | [3]
6 Rated [Member] | Commercial Real Estate [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Total ending loan balance, recorded investment | [3] |  |  | 457 |
6 Rated [Member] | Leases [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Total ending loan balance, recorded investment |  | 0 |  | 0 |
Impaired [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Total ending loan balance, recorded investment |  | 61,841 |  | 56,589 |
Impaired [Member] | Construction Real Estate Commercial [Domain] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Total ending loan balance, recorded investment |  | 2,529 |  | 1,324 |
Impaired [Member] | Residential Real Estate - Commercial [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Total ending loan balance, recorded investment |  | 2,750 |  | 19,059 |
Impaired [Member] | Commercial, Financial, and Agricultural [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Total ending loan balance, recorded investment |  | 30,034 | [2] | 18,064 | [3]
Impaired [Member] | Commercial Real Estate [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Total ending loan balance, recorded investment |  | 26,528 | [2] | 18,142 | [3]
Impaired [Member] | Leases [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Total ending loan balance, recorded investment |  | 0 |  | 0 |
Pass Rated [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Total ending loan balance, recorded investment |  | 2,638,829 |  | 2,672,410 |
Pass Rated [Member] | Construction Real Estate Commercial [Domain] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Total ending loan balance, recorded investment |  | 133,931 |  | 124,188 |
Pass Rated [Member] | Residential Real Estate - Commercial [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Total ending loan balance, recorded investment |  | 388,607 |  | 374,847 |
Pass Rated [Member] | Commercial, Financial, and Agricultural [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Total ending loan balance, recorded investment |  | 988,103 | [2] | 1,022,377 | [3]
Pass Rated [Member] | Commercial Real Estate [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Total ending loan balance, recorded investment |  | 1,125,498 | [2] | 1,147,969 | [3]
Pass Rated [Member] | Leases [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Total ending loan balance, recorded investment |  | 2,690 |  | 3,029 |
Recorded Investment [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Recorded Investment |  | 2,705,366 |  | 2,752,698 |
Recorded Investment [Member] | Construction Real Estate Commercial [Domain] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Recorded Investment |  | 136,481 |  | 125,790 |
Recorded Investment [Member] | Residential Real Estate - Commercial [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Recorded Investment |  | 391,720 |  | 394,123 |
Recorded Investment [Member] | Commercial, Financial, and Agricultural [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Recorded Investment |  | 1,019,389 | [2] | 1,057,866 | [3]
Recorded Investment [Member] | Commercial Real Estate [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Recorded Investment |  | 1,155,086 | [2] | 1,171,890 | [3]
Recorded Investment [Member] | Leases [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Recorded Investment |  | $ 2,690 |  | $ 3,029 |
[1] | Included within each of commercial, financial and agricultural loans and commercial real estate loans is an immaterial amount of consumer loans that are not broken out by class.
[2] | * Included within each of commercial, financial and agricultural loans and commercial real estate loans is an immaterial amount of consumer loans that are not broken out by class.
[3] | * Included within each of 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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