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Allowance For Loan Losses (Composition Of The Allowance For Loan Losses) (Details) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
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Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance for loan losses individually evaluated for impairment |  | $ 4,930 | $ 4,191
Allowance for loan losses collectively evaluated for impairment |  | 52,018 | 52,303
Total ending allowance balance |  | 56,948 | 56,494
Loans individually evaluated for impairment |  | 78,117 | 80,599
Loans collectively evaluated for impairment |  | 4,984,068 | 4,987,486
Total ending loan balance, net of accrued interest receivable |  | $ 5,062,185 | $ 5,068,085
Allowance for loan losses as a percentage of loan balance individually evaluated for impairment |  | 6.31105% | 5.19982%
Allowance for loan losses as a percentage of loan balance collectively evaluated for impairment |  | 1.04369% | 1.04868%
Total ending allowance for loan losses balance as a percentage of loan balance |  | 1.12497% | 1.1147%
Recorded investment |  | $ 78,171 | $ 80,664
Recorded investment collectively evaluated for impairment |  | 4,998,214 | 5,001,660
Recorded Investment |  | 5,076,385 | 5,082,324
Commercial Financial And Agricultural [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance for loan losses individually evaluated for impairment |  | 2,471 | 1,904
Allowance for loan losses collectively evaluated for impairment |  | 11,769 | 11,790
Total ending allowance balance |  | 14,240 | 13,694
Loans individually evaluated for impairment |  | 28,551 | 30,545
Loans collectively evaluated for impairment |  | 912,930 | 925,182
Total ending loan balance, net of accrued interest receivable | [1] | $ 941,481 | $ 955,727
Allowance for loan losses as a percentage of loan balance individually evaluated for impairment |  | 8.65469% | 6.23343%
Allowance for loan losses as a percentage of loan balance collectively evaluated for impairment |  | 1.28915% | 1.27434%
Total ending allowance for loan losses balance as a percentage of loan balance |  | 1.51251% | 1.43284%
Recorded investment |  | $ 28,596 | $ 30,595
Recorded investment collectively evaluated for impairment |  | 916,477 | 928,569
Recorded Investment | [1] | 945,073 | 959,164
Commercial Real Estate [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance for loan losses individually evaluated for impairment |  | 593 | 381
Allowance for loan losses collectively evaluated for impairment |  | 8,859 | 8,816
Total ending allowance balance |  | 9,452 | 9,197
Loans individually evaluated for impairment |  | 18,062 | 18,015
Loans collectively evaluated for impairment |  | 1,096,564 | 1,095,588
Total ending loan balance, net of accrued interest receivable | [1] | $ 1,114,626 | $ 1,113,603
Allowance for loan losses as a percentage of loan balance individually evaluated for impairment |  | 3.28314% | 2.1149%
Allowance for loan losses as a percentage of loan balance collectively evaluated for impairment |  | 0.80789% | 0.80468%
Total ending allowance for loan losses balance as a percentage of loan balance |  | 0.848% | 0.82588%
Recorded investment |  | $ 18,068 | $ 18,025
Recorded investment collectively evaluated for impairment |  | 1,100,210 | 1,099,587
Recorded Investment | [1] | 1,118,278 | 1,117,612
Construction Real Estate [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance for loan losses individually evaluated for impairment |  | 1,456 | 1,356
Allowance for loan losses collectively evaluated for impairment |  | 7,231 | 7,208
Total ending allowance balance |  | 8,687 | 8,564
Loans individually evaluated for impairment |  | 6,886 | 6,716
Loans collectively evaluated for impairment |  | 167,560 | 166,629
Total ending loan balance, net of accrued interest receivable |  | $ 174,446 | $ 173,345
Allowance for loan losses as a percentage of loan balance individually evaluated for impairment |  | 21.14435% | 20.19059%
Allowance for loan losses as a percentage of loan balance collectively evaluated for impairment |  | 4.31547% | 4.32578%
Total ending allowance for loan losses balance as a percentage of loan balance |  | 4.97976% | 4.94044%
Recorded investment |  | $ 6,888 | $ 6,720
Recorded investment collectively evaluated for impairment |  | 167,973 | 167,042
Recorded Investment |  | 174,861 | 173,762
Residential Real Estate [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance for loan losses individually evaluated for impairment |  | 410 | 550
Allowance for loan losses collectively evaluated for impairment |  | 12,978 | 12,964
Total ending allowance balance |  | 13,388 | 13,514
Loans individually evaluated for impairment |  | 24,618 | 25,323
Loans collectively evaluated for impairment |  | 1,825,086 | 1,830,120
Total ending loan balance, net of accrued interest receivable |  | $ 1,849,704 | $ 1,855,443
Allowance for loan losses as a percentage of loan balance individually evaluated for impairment |  | 1.66545% | 2.17194%
Allowance for loan losses as a percentage of loan balance collectively evaluated for impairment |  | 0.71109% | 0.70837%
Total ending allowance for loan losses balance as a percentage of loan balance |  | 0.72379% | 0.72834%
Recorded investment |  | $ 24,619 | $ 25,324
Recorded investment collectively evaluated for impairment |  | 1,828,691 | 1,833,449
Recorded Investment |  | 1,853,310 | 1,858,773
Consumer [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 |  | 11,180 | 11,524
Total ending allowance balance |  | 11,180 | 11,524
Loans individually evaluated for impairment |  | 0 | 0
Loans collectively evaluated for impairment |  | 979,111 | 967,111
Total ending loan balance, net of accrued interest receivable |  | $ 979,111 | $ 967,111
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 |  | 1.14185% | 1.19159%
Total ending allowance for loan losses balance as a percentage of loan balance |  | 1.14185% | 1.19159%
Recorded investment |  | $ 0 | $ 0
Recorded investment collectively evaluated for impairment |  | 982,007 | 970,143
Recorded Investment |  | 982,007 | 970,143
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 |  | 1 | 1
Total ending allowance balance |  | 1 | 1
Loans individually evaluated for impairment |  | 0 | 0
Loans collectively evaluated for impairment |  | 2,817 | 2,856
Total ending loan balance, net of accrued interest receivable |  | $ 2,817 | $ 2,856
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 |  | 0.0355% | 0.03501%
Total ending allowance for loan losses balance as a percentage of loan balance |  | 0.0355% | 0.03501%
Recorded investment |  | $ 0 | $ 0
Recorded investment collectively evaluated for impairment |  | 2,856 | 2,870
Recorded Investment |  | $ 2,856 | $ 2,870
[1] | Included within 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=66008989&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=66008989&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=66008989&loc=SL6953423-111524 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + 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=66008989&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=65884687&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=66008989&loc=d3e5074-111524 + Details
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