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Loans (Recorded Investment By Loan Grade) (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Recorded Investment |  | $ 5,625,323 |  | $ 5,372,483 |
Construction Real Estate Commercial [Domain] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Recorded Investment |  | 151,757 |  | 125,389 |
Residential Real Estate Commercial [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Recorded Investment |  | 403,147 |  | 393,094 |
Commercial Real Estate [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Recorded Investment | [1] | 1,302,630 |  | 1,167,607 |
Leases [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Recorded Investment |  | 2,632 |  | 2,993 |
5 Rated [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Total ending loan balance, recorded investment |  | 4,910 |  | 23,088 |
5 Rated [Member] | Construction Real Estate Commercial [Domain] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Total ending loan balance, recorded investment |  | 1,588 |  | 278 |
5 Rated [Member] | Residential Real Estate Commercial [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Total ending loan balance, recorded investment |  | 195 |  | 216 |
5 Rated [Member] | Commercial, Financial, and Agricultural [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Total ending loan balance, recorded investment |  | 980 | [2] | 17,272 | [3]
5 Rated [Member] | Commercial Real Estate [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Total ending loan balance, recorded investment |  | 2,147 | [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 |  | 495 |  | 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 |  | 44 |  | 1 |
6 Rated [Member] | Commercial, Financial, and Agricultural [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Total ending loan balance, recorded investment |  | 451 | [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 |  | 46,835 |  | 56,589 |
Impaired [Member] | Construction Real Estate Commercial [Domain] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Total ending loan balance, recorded investment |  | 2,016 |  | 1,324 |
Impaired [Member] | Residential Real Estate Commercial [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Total ending loan balance, recorded investment |  | 2,913 |  | 19,059 |
Impaired [Member] | Commercial, Financial, and Agricultural [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Total ending loan balance, recorded investment |  | 16,101 | [2] | 18,064 | [3]
Impaired [Member] | Commercial Real Estate [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Total ending loan balance, recorded investment |  | 25,805 | [2] | 18,142 | [3]
Impaired [Member] | Leases [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Total ending loan balance, recorded investment |  | 0 |  | 0 |
Purchased credit impaired [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Total ending loan balance, recorded investment |  | 4,494 |  |  |
Purchased credit impaired [Member] | Construction Real Estate Commercial [Domain] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Total ending loan balance, recorded investment |  | 499 |  |  |
Purchased credit impaired [Member] | Residential Real Estate Commercial [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Total ending loan balance, recorded investment |  | 44 |  |  |
Purchased credit impaired [Member] | Commercial, Financial, and Agricultural [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Total ending loan balance, recorded investment | [2] | 405 |  |  |
Purchased credit impaired [Member] | Commercial Real Estate [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Total ending loan balance, recorded investment | [2] | 3,546 |  |  |
Purchased credit 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 |  | 2,847,377 |  | 2,672,410 |
Pass Rated [Member] | Construction Real Estate Commercial [Domain] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Total ending loan balance, recorded investment |  | 148,128 |  | 125,790 |
Pass Rated [Member] | Residential Real Estate Commercial [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Total ending loan balance, recorded investment |  | 401,107 |  | 394,123 |
Pass Rated [Member] | Commercial, Financial, and Agricultural [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Total ending loan balance, recorded investment |  | 1,019,169 | [2] | 1,057,866 | [3]
Pass Rated [Member] | Commercial Real Estate [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Total ending loan balance, recorded investment |  | 1,276,301 | [2] | 1,171,890 | [3]
Pass Rated [Member] | Leases [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Total ending loan balance, recorded investment |  | 2,672 |  | 3,029 |
Recorded Investment [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Recorded Investment |  | 2,904,111 |  | 2,752,698 |
Recorded Investment [Member] | Construction Real Estate Commercial [Domain] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Recorded Investment |  | 152,231 |  | 124,188 |
Recorded Investment [Member] | Residential Real Estate Commercial [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Recorded Investment |  | 404,303 |  | 374,847 |
Recorded Investment [Member] | Commercial, Financial, and Agricultural [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Recorded Investment |  | 1,037,106 | [2] | 1,022,377 | [3]
Recorded Investment [Member] | Commercial Real Estate [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Recorded Investment |  | 1,307,799 | [2] | 1,147,969 | [3]
Recorded Investment [Member] | Leases [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Recorded Investment |  | $ 2,672 |  | $ 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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