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Allowance For Loan Losses (Composition Of The Allowance For Loan Losses) (Details) - USD ($) | Sep. 30, 2019 | Dec. 31, 2018
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Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Allowance for loan losses individually evaluated for impairment |  | $ 3,083,000 | $ 2,273,000
Allowance for loan losses collectively evaluated for impairment |  | 52,770,000 | 49,239,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net |  | 0 | 0
Total ending allowance balance |  | 55,853,000 | 51,512,000
Loans individually evaluated for impairment |  | 74,424,000 | 48,135,000
Loans collectively evaluated for impairment |  | 6,308,737,000 | 5,640,054,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance |  | 20,486,000 | 3,943,000
Total ending loan balance, net of accrued interest receivable |  | $ 6,403,647,000 | $ 5,692,132,000
Allowance for loan losses as a percentage of loan balance individually evaluated for impairment |  | 4.14% | 4.72%
Allowance for loan losses as a percentage of loan balance collectively evaluated for impairment |  | 0.84% | 0.87%
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance as a percentage of loan balance |  | 0.00% | 0.00%
Total ending allowance for loan losses balance as a percentage of loan balance |  | 0.87% | 0.90%
Recorded investment |  | $ 74,478,000 | $ 48,144,000
Recorded investment collectively evaluated for impairment |  | 6,328,643,000 | 5,657,693,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net |  | 20,634,000 | 3,961,000
Recorded Investment |  | 6,423,755,000 | 5,709,798,000
Commercial Financial And Agricultural [Member] |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Allowance for loan losses individually evaluated for impairment |  | 2,917,000 | 2,169,000
Allowance for loan losses collectively evaluated for impairment |  | 15,509,000 | 14,608,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net |  | 0 | 0
Total ending allowance balance |  | 18,426,000 | 16,777,000
Loans individually evaluated for impairment |  | 31,472,000 | 15,119,000
Loans collectively evaluated for impairment |  | 1,103,885,000 | 1,057,520,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance |  | 4,781,000 | 147,000
Total ending loan balance, net of accrued interest receivable | [1] | $ 1,140,138,000 | $ 1,072,786,000
Allowance for loan losses as a percentage of loan balance individually evaluated for impairment |  | 9.27% | 14.35%
Allowance for loan losses as a percentage of loan balance collectively evaluated for impairment |  | 1.40% | 1.38%
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance as a percentage of loan balance |  | 0.00% | 0.00%
Total ending allowance for loan losses balance as a percentage of loan balance |  | 1.62% | 1.56%
Recorded investment |  | $ 31,485,000 | $ 15,120,000
Recorded investment collectively evaluated for impairment |  | 1,109,254,000 | 1,062,121,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net |  | 4,803,000 | 148,000
Recorded Investment | [1] | 1,145,542,000 | 1,077,389,000
Commercial Real Estate [Member] |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Allowance for loan losses individually evaluated for impairment |  | 30,000 | 86,000
Allowance for loan losses collectively evaluated for impairment |  | 10,408,000 | 9,682,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net |  | 0 | 0
Total ending allowance balance |  | 10,438,000 | 9,768,000
Loans individually evaluated for impairment |  | 38,758,000 | 28,418,000
Loans collectively evaluated for impairment |  | 1,550,422,000 | 1,251,579,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance |  | 10,517,000 | 3,048,000
Total ending loan balance, net of accrued interest receivable | [1] | $ 1,599,697,000 | $ 1,283,045,000
Allowance for loan losses as a percentage of loan balance individually evaluated for impairment |  | 0.08% | 0.30%
Allowance for loan losses as a percentage of loan balance collectively evaluated for impairment |  | 0.67% | 0.77%
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance as a percentage of loan balance |  | 0.00% | 0.00%
Total ending allowance for loan losses balance as a percentage of loan balance |  | 0.65% | 0.76%
Recorded investment |  | $ 38,799,000 | $ 28,426,000
Recorded investment collectively evaluated for impairment |  | 1,556,070,000 | 1,256,310,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net |  | 10,595,000 | 3,059,000
Recorded Investment | [1] | 1,605,464,000 | 1,287,795,000
Construction Real Estate [Member] |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Allowance for loan losses individually evaluated for impairment |  | 0 | 0
Allowance for loan losses collectively evaluated for impairment |  | 5,432,000 | 4,463,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net |  | 0 | 0
Total ending allowance balance |  | 5,432,000 | 4,463,000
Loans individually evaluated for impairment |  | 1,869,000 | 1,866,000
Loans collectively evaluated for impairment |  | 314,942,000 | 245,909,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance |  | 1,358,000 | 499,000
Total ending loan balance, net of accrued interest receivable |  | $ 318,169,000 | $ 248,274,000
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 |  | 1.72% | 1.81%
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance as a percentage of loan balance |  | 0.00% | 0.00%
Total ending allowance for loan losses balance as a percentage of loan balance |  | 1.71% | 1.80%
Recorded investment |  | $ 1,868,000 | $ 1,866,000
Recorded investment collectively evaluated for impairment |  | 315,927,000 | 246,864,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net |  | 1,388,000 | 503,000
Recorded Investment |  | 319,183,000 | 249,233,000
Residential Real Estate [Member] |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Allowance for loan losses individually evaluated for impairment |  | 111,000 | 18,000
Allowance for loan losses collectively evaluated for impairment |  | 8,820,000 | 8,713,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net |  | 0 | 0
Total ending allowance balance |  | 8,931,000 | 8,731,000
Loans individually evaluated for impairment |  | 2,237,000 | 2,732,000
Loans collectively evaluated for impairment |  | 1,878,615,000 | 1,790,637,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance |  | 3,259,000 | 249,000
Total ending loan balance, net of accrued interest receivable |  | $ 1,884,111,000 | $ 1,793,618,000
Allowance for loan losses as a percentage of loan balance individually evaluated for impairment |  | 4.96% | 0.66%
Allowance for loan losses as a percentage of loan balance collectively evaluated for impairment |  | 0.47% | 0.49%
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance as a percentage of loan balance |  | 0.00% | 0.00%
Total ending allowance for loan losses balance as a percentage of loan balance |  | 0.47% | 0.49%
Recorded investment |  | $ 2,238,000 | $ 2,732,000
Recorded investment collectively evaluated for impairment |  | 1,882,543,000 | 1,794,207,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net |  | 3,277,000 | 251,000
Recorded Investment |  | 1,888,058,000 | 1,797,190,000
Consumer [Member] |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Allowance for loan losses individually evaluated for impairment |  | 0 | 0
Allowance for loan losses collectively evaluated for impairment |  | 12,555,000 | 11,773,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net |  | 0 | 0
Total ending allowance balance |  | 12,555,000 | 11,773,000
Loans individually evaluated for impairment |  | 0 | 0
Loans collectively evaluated for impairment |  | 1,430,397,000 | 1,292,136,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance |  | 3,000 | 0
Total ending loan balance, net of accrued interest receivable |  | $ 1,430,400,000 | $ 1,292,136,000
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 |  | 0.88% | 0.91%
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance as a percentage of loan balance |  | 0.00% | 0.00%
Total ending allowance for loan losses balance as a percentage of loan balance |  | 0.88% | 0.91%
Recorded investment |  | $ 0 | $ 0
Recorded investment collectively evaluated for impairment |  | 1,434,343,000 | 1,295,892,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net |  | 3,000 | 0
Recorded Investment |  | 1,434,346,000 | 1,295,892,000
Finance Leases Portfolio Segment [Member] |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Allowance for loan losses individually evaluated for impairment |  | 25,000 | 0
Allowance for loan losses collectively evaluated for impairment |  | 46,000 | 0
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net |  | 0 | 0
Total ending allowance balance |  | 71,000 | 0
Loans individually evaluated for impairment |  | 88,000 | 0
Loans collectively evaluated for impairment |  | 30,476,000 | 2,273,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance |  | 568,000 | 0
Total ending loan balance, net of accrued interest receivable |  | $ 31,132,000 | $ 2,273,000
Allowance for loan losses as a percentage of loan balance individually evaluated for impairment |  | 28.41% | 0.00%
Allowance for loan losses as a percentage of loan balance collectively evaluated for impairment |  | 0.15% | 0.00%
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance as a percentage of loan balance |  | 0.00% | 0.00%
Total ending allowance for loan losses balance as a percentage of loan balance |  | 0.23% | 0.00%
Recorded investment |  | $ 88,000 | $ 0
Recorded investment collectively evaluated for impairment |  | 30,506,000 | 2,299,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net |  | 568,000 | 0
Recorded Investment |  | 31,162,000 | 2,299,000
Purchased credit impaired [Member] |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Loans and Leases Receivable, Gross |  | 19,180,000 | 3,961,000
Purchased credit impaired [Member] | Commercial Real Estate [Member] |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Loans and Leases Receivable, Gross | [2] | 10,595,000 | 3,059,000
Purchased credit impaired [Member] | Finance Leases Portfolio Segment [Member] |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Loans and Leases Receivable, Gross |  |  | 0
Purchased credit impaired [Member] | Financial Asset Acquired with Credit Deterioration [Member] | Nonperforming Financial Instruments [Member] | Commercial Portfolio Segment [Member] |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |
Allowance for loan losses individually evaluated for impairment |  | 0 | 0
Loans and Leases Receivable, Gross |  | 11,000 | 475,000
Recorded Investment |  | $ 11,000 | $ 475,000
[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.

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- Definition Reserve for loans impairments recorded after acquisition as a result of current information and events which result in it being probable that estimated cash flows will be less than previously expected or because actual cash flows are less than cash flows previously expected. This relates to loans not accounted for as debt securities, with evidence of deterioration of credit quality since origination that was acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=118938799&loc=d3e13503-111538 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=118939070&loc=d3e15032-111544 + Details
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- Definition The recorded balance, net of any applicable reductions (for example, unamortized accretable yield and allowance for loan losses). This relates to loans not accounted for debt securities with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=118939070&loc=d3e15032-111544 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=118938799&loc=d3e13503-111538 + Details
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- Definition The undiscounted sum of all amounts, including amounts deemed principal, interest, fees, penalties, and other under the loan, owed to the investor at the reporting date, whether or not currently due and whether or not any such amounts have been written or charged off by the investor. This relates to loans not accounted for as debt securities, with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=118938799&loc=d3e13503-111538 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=118939070&loc=d3e15032-111544 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953423-111524 + Details
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