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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.