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Loans (Recorded Investment By Loan Grade) (Details) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Recorded Investment |  | $ 5,328,090 |  | $ 5,286,830 |
Construction Real Estate Commercial [Domain] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Recorded Investment |  | 112,353 |  | 135,741 |
Residential Real Estate - Commercial [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Recorded Investment |  | 397,587 |  | 407,627 |
Commercial Real Estate [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Recorded Investment | [1] | 1,191,265 |  | 1,159,864 |
Leases [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Recorded Investment |  | 3,706 |  | 3,272 |
5 Rated [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Total ending loan balance, recorded investment |  | 8,418 |  | 14,716 |
5 Rated [Member] | Construction Real Estate Commercial [Domain] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Total ending loan balance, recorded investment |  | 90 |  | 287 |
5 Rated [Member] | Residential Real Estate - Commercial [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Total ending loan balance, recorded investment |  | 1,061 |  | 1,055 |
5 Rated [Member] | Commercial, Financial, and Agricultural [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Total ending loan balance, recorded investment |  | 1,394 | [2] | 5,826 | [3]
5 Rated [Member] | Commercial Real Estate [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Total ending loan balance, recorded investment |  | 5,873 | [2] | 7,548 | [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 |  | 779 |  | 432 |
6 Rated [Member] | Construction Real Estate Commercial [Domain] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Total ending loan balance, recorded investment |  | 116 |  | 118 |
6 Rated [Member] | Residential Real Estate - Commercial [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Total ending loan balance, recorded investment |  | 216 |  | 124 |
6 Rated [Member] | Commercial, Financial, and Agricultural [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Total ending loan balance, recorded investment | [2] | 179 |  |  |
6 Rated [Member] | Commercial Real Estate [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Total ending loan balance, recorded investment |  | 268 | [2] | 190 | [3]
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 |  | 70,168 |  | 70,459 |
Impaired [Member] | Construction Real Estate Commercial [Domain] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Total ending loan balance, recorded investment |  | 2,041 |  | 2,226 |
Impaired [Member] | Residential Real Estate - Commercial [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Total ending loan balance, recorded investment |  | 22,803 |  | 23,102 |
Impaired [Member] | Commercial, Financial, and Agricultural [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Total ending loan balance, recorded investment |  | 22,592 | [2] | 20,657 | [3]
Impaired [Member] | Commercial Real Estate [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Total ending loan balance, recorded investment |  | 22,732 | [2] | 24,474 | [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 |  | 2,624,821 |  | 2,619,074 |
Pass Rated [Member] | Construction Real Estate Commercial [Domain] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Total ending loan balance, recorded investment |  | 110,106 |  | 133,110 |
Pass Rated [Member] | Residential Real Estate - Commercial [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Total ending loan balance, recorded investment |  | 373,507 |  | 383,346 |
Pass Rated [Member] | Commercial, Financial, and Agricultural [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Total ending loan balance, recorded investment |  | 975,110 | [2] | 971,694 | [3]
Pass Rated [Member] | Commercial Real Estate [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Total ending loan balance, recorded investment |  | 1,162,392 | [2] | 1,127,652 | [3]
Pass Rated [Member] | Leases [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Total ending loan balance, recorded investment |  | 3,706 |  | 3,272 |
Recorded Investment [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Recorded Investment |  | 2,704,186 |  | 2,704,681 |
Recorded Investment [Member] | Construction Real Estate Commercial [Domain] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Recorded Investment |  | 112,353 |  | 135,741 |
Recorded Investment [Member] | Residential Real Estate - Commercial [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Recorded Investment |  | 397,587 |  | 407,627 |
Recorded Investment [Member] | Commercial, Financial, and Agricultural [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Recorded Investment |  | 999,275 | [2] | 998,177 | [3]
Recorded Investment [Member] | Commercial Real Estate [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Recorded Investment |  | 1,191,265 | [2] | 1,159,864 | [3]
Recorded Investment [Member] | Leases [Member] |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Recorded Investment |  | $ 3,706 |  | $ 3,272 |
[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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- Definition Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=65884687&loc=d3e4428-111522 + Details
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