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Allowance For Loan Losses (Composition Of The Allowance For Loan Losses) (Details) - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014
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Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance for loan losses individually evaluated for impairment |  | $ 5,738 | $ 3,660
Allowance for loan losses collectively evaluated for impairment |  | 52,745 | 50,692
Total ending allowance balance |  | 58,483 | 54,352
Loans individually evaluated for impairment |  | 69,188 | 73,676
Loans collectively evaluated for impairment |  | 4,930,724 | 4,756,006
Total ending loan balance, net of accrued interest receivable |  | $ 4,999,912 | $ 4,829,682
Allowance for loan losses as a percentage of loan balance individually evaluated for impairment |  | 8.29335% | 4.9677%
Allowance for loan losses as a percentage of loan balance collectively evaluated for impairment |  | 1.06972% | 1.06585%
Total ending allowance for loan losses balance as a percentage of loan balance |  | 1.16968% | 1.12537%
Recorded investment |  | $ 69,224 | $ 73,712
Recorded investment collectively evaluated for impairment |  | 4,945,340 | 4,769,599
Recorded Investment |  | 5,014,564 | 4,843,311
Commercial Financial And Agricultural [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance for loan losses individually evaluated for impairment |  | 2,495 | 981
Allowance for loan losses collectively evaluated for impairment |  | 10,764 | 9,738
Total ending allowance balance |  | 13,259 | 10,719
Loans individually evaluated for impairment |  | 19,150 | 19,103
Loans collectively evaluated for impairment |  | 889,875 | 837,432
Total ending loan balance, net of accrued interest receivable | [1] | $ 909,025 | $ 856,535
Allowance for loan losses as a percentage of loan balance individually evaluated for impairment |  | 13.02872% | 5.13532%
Allowance for loan losses as a percentage of loan balance collectively evaluated for impairment |  | 1.20961% | 1.16284%
Total ending allowance for loan losses balance as a percentage of loan balance |  | 1.4586% | 1.25144%
Recorded investment |  | $ 19,154 | $ 19,106
Recorded investment collectively evaluated for impairment |  | 893,349 | 840,647
Recorded Investment | [1] | 912,503 | 859,753
Commercial Real Estate [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance for loan losses individually evaluated for impairment |  | 488 | 262
Allowance for loan losses collectively evaluated for impairment |  | 8,967 | 8,546
Total ending allowance balance |  | 9,455 | 8,808
Loans individually evaluated for impairment |  | 17,651 | 21,978
Loans collectively evaluated for impairment |  | 1,073,927 | 1,047,659
Total ending loan balance, net of accrued interest receivable | [1] | $ 1,091,578 | $ 1,069,637
Allowance for loan losses as a percentage of loan balance individually evaluated for impairment |  | 2.76472% | 1.1921%
Allowance for loan losses as a percentage of loan balance collectively evaluated for impairment |  | 0.83497% | 0.81572%
Total ending allowance for loan losses balance as a percentage of loan balance |  | 0.86618% | 0.82346%
Recorded investment |  | $ 17,662 | $ 21,989
Recorded investment collectively evaluated for impairment |  | 1,078,155 | 1,051,194
Recorded Investment | [1] | 1,095,817 | 1,073,183
Construction Real Estate [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance for loan losses individually evaluated for impairment |  | 2,118 | 1,812
Allowance for loan losses collectively evaluated for impairment |  | 6,872 | 6,840
Total ending allowance balance |  | 8,990 | 8,652
Loans individually evaluated for impairment |  | 8,038 | 7,690
Loans collectively evaluated for impairment |  | 152,334 | 148,114
Total ending loan balance, net of accrued interest receivable |  | $ 160,372 | $ 155,804
Allowance for loan losses as a percentage of loan balance individually evaluated for impairment |  | 26.34984% | 23.56307%
Allowance for loan losses as a percentage of loan balance collectively evaluated for impairment |  | 4.51114% | 4.61806%
Total ending allowance for loan losses balance as a percentage of loan balance |  | 5.60572% | 5.55313%
Recorded investment |  | $ 8,038 | $ 7,687
Recorded investment collectively evaluated for impairment |  | 152,710 | 148,512
Recorded Investment |  | 160,748 | 156,199
Residential Real Estate [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance for loan losses individually evaluated for impairment |  | 637 | 605
Allowance for loan losses collectively evaluated for impairment |  | 14,385 | 14,167
Total ending allowance balance |  | 15,022 | 14,772
Loans individually evaluated for impairment |  | 24,349 | 24,905
Loans collectively evaluated for impairment |  | 1,841,951 | 1,826,470
Total ending loan balance, net of accrued interest receivable |  | $ 1,866,300 | $ 1,851,375
Allowance for loan losses as a percentage of loan balance individually evaluated for impairment |  | 2.61612% | 2.42923%
Allowance for loan losses as a percentage of loan balance collectively evaluated for impairment |  | 0.78097% | 0.77565%
Total ending allowance for loan losses balance as a percentage of loan balance |  | 0.80491% | 0.79789%
Recorded investment |  | $ 24,370 | $ 24,930
Recorded investment collectively evaluated for impairment |  | 1,845,487 | 1,829,931
Recorded Investment |  | 1,869,857 | 1,854,861
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 |  | 11,757 | 11,401
Total ending allowance balance |  | 11,757 | 11,401
Loans individually evaluated for impairment |  | 0 | 0
Loans collectively evaluated for impairment |  | 969,586 | 893,160
Total ending loan balance, net of accrued interest receivable |  | $ 969,586 | $ 893,160
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 |  | 1.21258% | 1.27648%
Total ending allowance for loan losses balance as a percentage of loan balance |  | 1.21258% | 1.27648%
Recorded investment |  | $ 0 | $ 0
Recorded investment collectively evaluated for impairment |  | 972,535 | 896,127
Recorded Investment |  | 972,535 | 896,127
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 |  | 3,051 | 3,171
Total ending loan balance, net of accrued interest receivable |  | $ 3,051 | $ 3,171
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 |  | 3,104 | 3,188
Recorded Investment |  | $ 3,104 | $ 3,188
[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=49124121&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=49124121&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=49124121&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=49124121&loc=SL6953423-111524 + Details
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- Definition The balance of financing receivables 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 (h) -URI http://asc.fasb.org/extlink&oid=49124121&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=28367877&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=49124121&loc=d3e5074-111524 + Details
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