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Allowance For Loan Losses (Composition Of The Allowance For Loan Losses) (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
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Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance for loan losses individually evaluated for impairment |  | $ 5,102 | $ 548
Allowance for loan losses collectively evaluated for impairment |  | 50,130 | 50,076
Total ending allowance balance |  | 55,232 | 50,624
Loans individually evaluated for impairment |  | 73,550 | 70,415
Loans collectively evaluated for impairment |  | 5,292,327 | 5,201,442
Total ending loan balance, net of accrued interest receivable |  | $ 5,365,877 | $ 5,271,857
Allowance for loan losses as a percentage of loan balance individually evaluated for impairment |  | 6.93678% | 0.77824%
Allowance for loan losses as a percentage of loan balance collectively evaluated for impairment |  | 0.94722% | 0.96273%
Total ending allowance for loan losses balance as a percentage of loan balance |  | 1.02932% | 0.96027%
Recorded investment |  | $ 73,609 | $ 70,426
Recorded investment collectively evaluated for impairment |  | 5,308,734 | 5,216,404
Recorded Investment |  | 5,382,343 | 5,286,830
Commercial Financial And Agricultural [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance for loan losses individually evaluated for impairment |  | 4,761 | 152
Allowance for loan losses collectively evaluated for impairment |  | 13,216 | 13,282
Total ending allowance balance |  | 17,977 | 13,434
Loans individually evaluated for impairment |  | 29,844 | 20,622
Loans collectively evaluated for impairment |  | 995,213 | 973,997
Total ending loan balance, net of accrued interest receivable | [1] | $ 1,025,057 | $ 994,619
Allowance for loan losses as a percentage of loan balance individually evaluated for impairment |  | 15.95296% | 0.73708%
Allowance for loan losses as a percentage of loan balance collectively evaluated for impairment |  | 1.32796% | 1.36366%
Total ending allowance for loan losses balance as a percentage of loan balance |  | 1.75376% | 1.35067%
Recorded investment |  | $ 29,848 | $ 20,624
Recorded investment collectively evaluated for impairment |  | 999,790 | 977,553
Recorded Investment | [1] | 1,029,638 | 998,177
Commercial Real Estate [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance for loan losses individually evaluated for impairment |  | 320 | 309
Allowance for loan losses collectively evaluated for impairment |  | 9,852 | 10,123
Total ending allowance balance |  | 10,172 | 10,432
Loans individually evaluated for impairment |  | 22,943 | 24,465
Loans collectively evaluated for impairment |  | 1,132,719 | 1,131,238
Total ending loan balance, net of accrued interest receivable | [1] | $ 1,155,662 | $ 1,155,703
Allowance for loan losses as a percentage of loan balance individually evaluated for impairment |  | 1.39476% | 1.26303%
Allowance for loan losses as a percentage of loan balance collectively evaluated for impairment |  | 0.86977% | 0.89486%
Total ending allowance for loan losses balance as a percentage of loan balance |  | 0.88019% | 0.90265%
Recorded investment |  | $ 22,995 | $ 24,474
Recorded investment collectively evaluated for impairment |  | 1,137,131 | 1,135,390
Recorded Investment | [1] | 1,160,126 | 1,159,864
Construction Real Estate [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance for loan losses individually evaluated for impairment |  | 0 | 0
Allowance for loan losses collectively evaluated for impairment |  | 5,401 | 5,247
Total ending allowance balance |  | 5,401 | 5,247
Loans individually evaluated for impairment |  | 1,458 | 2,226
Loans collectively evaluated for impairment |  | 189,590 | 186,719
Total ending loan balance, net of accrued interest receivable |  | $ 191,048 | $ 188,945
Allowance for loan losses as a percentage of loan balance individually evaluated for impairment |  | 0.00% | 0.00%
Allowance for loan losses as a percentage of loan balance collectively evaluated for impairment |  | 2.84878% | 2.81011%
Total ending allowance for loan losses balance as a percentage of loan balance |  | 2.82704% | 2.777%
Recorded investment |  | $ 1,460 | $ 2,226
Recorded investment collectively evaluated for impairment |  | 190,170 | 187,240
Recorded Investment |  | 191,630 | 189,466
Residential Real Estate [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance for loan losses individually evaluated for impairment |  | 13 | 87
Allowance for loan losses collectively evaluated for impairment |  | 10,072 | 10,871
Total ending allowance balance |  | 10,085 | 10,958
Loans individually evaluated for impairment |  | 19,297 | 23,102
Loans collectively evaluated for impairment |  | 1,733,290 | 1,785,395
Total ending loan balance, net of accrued interest receivable |  | $ 1,752,587 | $ 1,808,497
Allowance for loan losses as a percentage of loan balance individually evaluated for impairment |  | 0.06737% | 0.37659%
Allowance for loan losses as a percentage of loan balance collectively evaluated for impairment |  | 0.58109% | 0.60888%
Total ending allowance for loan losses balance as a percentage of loan balance |  | 0.57544% | 0.60592%
Recorded investment |  | $ 19,298 | $ 23,102
Recorded investment collectively evaluated for impairment |  | 1,736,667 | 1,788,714
Recorded Investment |  | 1,755,965 | 1,811,816
Consumer [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance for loan losses individually evaluated for impairment |  | 8 | 0
Allowance for loan losses collectively evaluated for impairment |  | 11,589 | 10,553
Total ending allowance balance |  | 11,597 | 10,553
Loans individually evaluated for impairment |  | 8 | 0
Loans collectively evaluated for impairment |  | 1,238,183 | 1,120,850
Total ending loan balance, net of accrued interest receivable |  | $ 1,238,191 | $ 1,120,850
Allowance for loan losses as a percentage of loan balance individually evaluated for impairment |  | 0.00% | 0.00%
Allowance for loan losses as a percentage of loan balance collectively evaluated for impairment |  | 0.93597% | 0.94152%
Total ending allowance for loan losses balance as a percentage of loan balance |  | 0.93661% | 0.94152%
Recorded investment |  | $ 8 | $ 0
Recorded investment collectively evaluated for impairment |  | 1,241,592 | 1,124,235
Recorded Investment |  | 1,241,600 | 1,124,235
Leases [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance for loan losses individually evaluated for impairment |  | 0 | 0
Allowance for loan losses collectively evaluated for impairment |  | 0 | 0
Total ending allowance balance |  | 0 | 0
Loans individually evaluated for impairment |  | 0 | 0
Loans collectively evaluated for impairment |  | 3,332 | 3,243
Total ending loan balance, net of accrued interest receivable |  | $ 3,332 | $ 3,243
Allowance for loan losses as a percentage of loan balance individually evaluated for impairment |  | 0.00% | 0.00%
Allowance for loan losses as a percentage of loan balance collectively evaluated for impairment |  | 0.00% | 0.00%
Total ending allowance for loan losses balance as a percentage of loan balance |  | 0.00% | 0.00%
Recorded investment |  | $ 0 | $ 0
Recorded investment collectively evaluated for impairment |  | 3,384 | 3,272
Recorded Investment |  | $ 3,384 | $ 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.

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- Definition Loans And Leases Receivable, Ratio Of Allowance For Loan Losses To Total Loans, Individually Evaluated for Impairment + References No definition available. + Details
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- Definition A valuation allowance for financing receivables that are expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition The balance of financing receivables that were collectively evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. 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=82891408&loc=d3e4428-111522 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5074-111524 + Details
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