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Allowance For Loan Losses (Composition Of The Allowance For Loan Losses) (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
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Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance for loan losses individually evaluated for impairment |  | $ 1,207 | $ 684
Allowance for loan losses collectively evaluated for impairment |  | 47,762 | 49,304
Total ending allowance balance |  | 48,969 | 49,988
Loans individually evaluated for impairment |  | 50,292 | 56,545
Loans collectively evaluated for impairment |  | 5,242,057 | 5,315,938
Total ending loan balance, net of accrued interest receivable |  | $ 5,292,349 | $ 5,372,483
Allowance for loan losses as a percentage of loan balance individually evaluated for impairment |  | 2.39998% | 1.20966%
Allowance for loan losses as a percentage of loan balance collectively evaluated for impairment |  | 0.91113% | 0.92748%
Total ending allowance for loan losses balance as a percentage of loan balance |  | 0.92528% | 0.93045%
Recorded investment |  | $ 50,322 | $ 56,564
Recorded investment collectively evaluated for impairment |  | 5,257,653 | 5,332,578
Recorded Investment |  | 5,307,975 | 5,389,142
Commercial Financial And Agricultural [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance for loan losses individually evaluated for impairment |  | 1,165 | 681
Allowance for loan losses collectively evaluated for impairment |  | 12,912 | 14,341
Total ending allowance balance |  | 14,077 | 15,022
Loans individually evaluated for impairment |  | 27,045 | 18,034
Loans collectively evaluated for impairment |  | 973,741 | 1,035,419
Total ending loan balance, net of accrued interest receivable | [1] | $ 1,000,786 | $ 1,053,453
Allowance for loan losses as a percentage of loan balance individually evaluated for impairment |  | 4.30764% | 3.7762%
Allowance for loan losses as a percentage of loan balance collectively evaluated for impairment |  | 1.32602% | 1.38504%
Total ending allowance for loan losses balance as a percentage of loan balance |  | 1.40659% | 1.42598%
Recorded investment |  | $ 27,050 | $ 18,039
Recorded investment collectively evaluated for impairment |  | 977,979 | 1,039,827
Recorded Investment | [1] | 1,005,029 | 1,057,866
Commercial Real Estate [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance for loan losses individually evaluated for impairment |  | 29 | 2
Allowance for loan losses collectively evaluated for impairment |  | 9,459 | 9,599
Total ending allowance balance |  | 9,488 | 9,601
Loans individually evaluated for impairment |  | 18,960 | 18,131
Loans collectively evaluated for impairment |  | 1,137,603 | 1,149,476
Total ending loan balance, net of accrued interest receivable | [1] | $ 1,156,563 | $ 1,167,607
Allowance for loan losses as a percentage of loan balance individually evaluated for impairment |  | 0.15295% | 0.01103%
Allowance for loan losses as a percentage of loan balance collectively evaluated for impairment |  | 0.83149% | 0.83508%
Total ending allowance for loan losses balance as a percentage of loan balance |  | 0.82036% | 0.82228%
Recorded investment |  | $ 18,983 | $ 18,142
Recorded investment collectively evaluated for impairment |  | 1,141,627 | 1,153,748
Recorded Investment | [1] | 1,160,610 | 1,171,890
Construction Real Estate [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 |  | 4,455 | 4,430
Total ending allowance balance |  | 4,463 | 4,430
Loans individually evaluated for impairment |  | 1,391 | 1,322
Loans collectively evaluated for impairment |  | 179,793 | 180,148
Total ending loan balance, net of accrued interest receivable |  | $ 181,184 | $ 181,470
Allowance for loan losses as a percentage of loan balance individually evaluated for impairment |  | 0.57513% | 0.00%
Allowance for loan losses as a percentage of loan balance collectively evaluated for impairment |  | 2.47785% | 2.45909%
Total ending allowance for loan losses balance as a percentage of loan balance |  | 2.46324% | 2.44117%
Recorded investment |  | $ 1,393 | $ 1,324
Recorded investment collectively evaluated for impairment |  | 180,296 | 180,693
Recorded Investment |  | 181,689 | 182,017
Residential Real Estate [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |  |
Allowance for loan losses individually evaluated for impairment |  | 5 | 1
Allowance for loan losses collectively evaluated for impairment |  | 9,410 | 9,320
Total ending allowance balance |  | 9,415 | 9,321
Loans individually evaluated for impairment |  | 2,896 | 19,058
Loans collectively evaluated for impairment |  | 1,695,764 | 1,706,166
Total ending loan balance, net of accrued interest receivable |  | $ 1,698,660 | $ 1,725,224
Allowance for loan losses as a percentage of loan balance individually evaluated for impairment |  | 0.17265% | 0.00525%
Allowance for loan losses as a percentage of loan balance collectively evaluated for impairment |  | 0.55491% | 0.54625%
Total ending allowance for loan losses balance as a percentage of loan balance |  | 0.55426% | 0.54028%
Recorded investment |  | $ 2,896 | $ 19,059
Recorded investment collectively evaluated for impairment |  | 1,699,087 | 1,709,737
Recorded Investment |  | 1,701,983 | 1,728,796
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 |  | 11,526 | 11,614
Total ending allowance balance |  | 11,526 | 11,614
Loans individually evaluated for impairment |  | 0 | 0
Loans collectively evaluated for impairment |  | 1,252,251 | 1,241,736
Total ending loan balance, net of accrued interest receivable |  | $ 1,252,251 | $ 1,241,736
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 |  | 0.92042% | 0.9353%
Total ending allowance for loan losses balance as a percentage of loan balance |  | 0.92042% | 0.9353%
Recorded investment |  | $ 0 | $ 0
Recorded investment collectively evaluated for impairment |  | 1,255,713 | 1,245,544
Recorded Investment |  | 1,255,713 | 1,245,544
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 |  | 2,905 | 2,993
Total ending loan balance, net of accrued interest receivable |  | $ 2,905 | $ 2,993
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 |  | 2,951 | 3,029
Recorded Investment |  | $ 2,951 | $ 3,029
[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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