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Allowance For Credit Losses (Composition Of The Allowance For Loan Losses) (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Jun. 30, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Dec. 31, 2019
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Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |
Allowance for loan losses individually evaluated for impairment |  | $ 3,466 |  | $ 5,434 |  |  |  |
Allowance for loan losses collectively evaluated for impairment |  | 84,663 |  | 80,074 |  |  |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net |  | 0 |  | 167 |  |  |  |
Total ending allowance balance |  | 88,129 | $ 83,577 | 85,675 |  | $ 87,038 | $ 73,476 | $ 56,679
Loans individually evaluated for impairment |  | 79,264 |  | 108,407 |  |  |  |
Loans collectively evaluated for impairment |  | 6,820,448 |  | 7,058,225 |  |  |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance |  | 8,705 |  | 11,153 |  |  |  |
Total ending loan balance, net of accrued interest receivable |  | $ 6,908,417 |  | $ 7,177,785 |  |  |  |
Allowance for loan losses as a percentage of loan balance individually evaluated for impairment |  | 4.37% |  | 5.01% |  |  |  |
Allowance for loan losses as a percentage of loan balance collectively evaluated for impairment |  | 1.24% |  | 1.13% |  |  |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance as a percentage of loan balance |  | 0.00% |  | 1.50% |  |  |  |
Total ending allowance for loan losses balance as a percentage of loan balance |  | 1.28% |  | 1.19% |  |  |  |
Loans And Leases Receivable, Recorded Investment, Individually Evaluated for Impairment |  |  |  | $ 108,455 |  |  |  |
Recorded investment collectively evaluated for impairment |  |  |  | 7,078,699 |  |  |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net |  |  |  | 11,284 |  |  |  |
Recorded Investment |  |  |  | 7,198,438 |  |  |  |
Commercial Financial And Agricultural [Member] |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |
Allowance for loan losses individually evaluated for impairment |  | $ 3,183 |  | 3,758 |  |  |  |
Allowance for loan losses collectively evaluated for impairment |  | 12,793 |  | 21,809 |  |  |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net |  | 0 |  | 41 |  |  |  |
Total ending allowance balance |  | 15,976 | 15,222 | 25,608 |  | 26,987 | 23,476 | 20,203
Loans individually evaluated for impairment |  | 22,018 |  | 28,811 |  |  |  |
Loans collectively evaluated for impairment |  | 1,292,601 |  | 1,559,842 |  |  |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance |  | 251 |  | 336 |  |  |  |
Total ending loan balance, net of accrued interest receivable |  | $ 1,314,870 |  | $ 1,588,989 | [1] |  |  |
Allowance for loan losses as a percentage of loan balance individually evaluated for impairment |  | 14.46% |  | 13.04% |  |  |  |
Allowance for loan losses as a percentage of loan balance collectively evaluated for impairment |  | 0.99% |  | 1.40% |  |  |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance as a percentage of loan balance |  | 0.00% |  | 12.20% |  |  |  |
Total ending allowance for loan losses balance as a percentage of loan balance |  | 1.22% |  | 1.61% |  |  |  |
Loans And Leases Receivable, Recorded Investment, Individually Evaluated for Impairment |  |  |  | $ 28,836 |  |  |  |
Recorded investment collectively evaluated for impairment |  |  |  | 1,566,344 |  |  |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net |  |  |  | 337 |  |  |  |
Recorded Investment | [1] |  |  | 1,595,517 |  |  |  |
Commercial Real Estate [Member] |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |
Allowance for loan losses individually evaluated for impairment |  | $ 180 |  | 1,316 |  |  |  |
Allowance for loan losses collectively evaluated for impairment |  | 25,988 |  | 22,093 |  |  |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net |  | 0 |  | 71 |  |  |  |
Total ending allowance balance |  | 26,168 | 22,749 | 23,480 |  | 22,888 | 16,469 | 10,229
Loans individually evaluated for impairment |  | 50,541 |  | 70,334 |  |  |  |
Loans collectively evaluated for impairment |  | 1,704,527 |  | 1,670,510 |  |  |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance |  | 6,528 |  | 7,345 |  |  |  |
Total ending loan balance, net of accrued interest receivable | [1] | $ 1,761,596 |  | $ 1,748,189 |  |  |  |
Allowance for loan losses as a percentage of loan balance individually evaluated for impairment |  | 0.36% |  | 1.87% |  |  |  |
Allowance for loan losses as a percentage of loan balance collectively evaluated for impairment |  | 1.52% |  | 1.32% |  |  |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance as a percentage of loan balance |  | 0.00% |  | 0.97% |  |  |  |
Total ending allowance for loan losses balance as a percentage of loan balance |  | 1.49% |  | 1.34% |  |  |  |
Loans And Leases Receivable, Recorded Investment, Individually Evaluated for Impairment |  |  |  | $ 70,357 |  |  |  |
Recorded investment collectively evaluated for impairment |  |  |  | 1,676,388 |  |  |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net |  |  |  | 7,461 |  |  |  |
Recorded Investment |  |  |  | 1,754,206 |  |  |  |
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 |  | 6,264 |  | 7,288 |  |  |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net |  | 0 |  | 0 |  |  |  |
Total ending allowance balance |  | 6,264 | 5,670 | 7,288 |  | 8,407 | 6,828 | 5,311
Loans individually evaluated for impairment |  | 442 |  | 3,110 |  |  |  |
Loans collectively evaluated for impairment |  | 341,480 |  | 339,312 |  |  |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance |  | 965 |  | 999 |  |  |  |
Total ending loan balance, net of accrued interest receivable |  | $ 342,887 |  | $ 343,421 |  |  |  |
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 |  | 1.83% |  | 2.15% |  |  |  |
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 |  | 1.83% |  | 2.12% |  |  |  |
Loans And Leases Receivable, Recorded Investment, Individually Evaluated for Impairment |  |  |  | $ 3,110 |  |  |  |
Recorded investment collectively evaluated for impairment |  |  |  | 340,116 |  |  |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net |  |  |  | 1,002 |  |  |  |
Recorded Investment |  |  |  | 344,228 |  |  |  |
Residential Real Estate [Member] |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |
Allowance for loan losses individually evaluated for impairment |  | $ 0 |  | 16 |  |  |  |
Allowance for loan losses collectively evaluated for impairment |  | 11,762 |  | 11,292 |  |  |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net |  | 0 |  | 55 |  |  |  |
Total ending allowance balance |  | 11,762 | 13,113 | 11,363 |  | 11,208 | 10,507 | 8,610
Loans individually evaluated for impairment |  | 4,857 |  | 4,557 |  |  |  |
Loans collectively evaluated for impairment |  | 1,746,339 |  | 1,806,126 |  |  |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance |  | 912 |  | 2,361 |  |  |  |
Total ending loan balance, net of accrued interest receivable |  | $ 1,752,108 |  | $ 1,813,044 |  |  |  |
Allowance for loan losses as a percentage of loan balance individually evaluated for impairment |  | 0.00% |  | 0.35% |  |  |  |
Allowance for loan losses as a percentage of loan balance collectively evaluated for impairment |  | 0.67% |  | 0.63% |  |  |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Allowance as a percentage of loan balance |  | 0.00% |  | 2.33% |  |  |  |
Total ending allowance for loan losses balance as a percentage of loan balance |  | 0.67% |  | 0.63% |  |  |  |
Loans And Leases Receivable, Recorded Investment, Individually Evaluated for Impairment |  |  |  | $ 4,557 |  |  |  |
Recorded investment collectively evaluated for impairment |  |  |  | 1,808,892 |  |  |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net |  |  |  | 2,372 |  |  |  |
Recorded Investment |  |  |  | 1,815,821 |  |  |  |
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 |  | 27,659 |  | 17,418 |  |  |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net |  | 0 |  | 0 |  |  |  |
Total ending allowance balance |  | 27,659 | 26,261 | 17,418 |  | 16,969 | 15,624 | 12,211
Loans individually evaluated for impairment |  | 0 |  | 0 |  |  |  |
Loans collectively evaluated for impairment |  | 1,715,324 |  | 1,659,704 |  |  |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance |  | 0 |  | 0 |  |  |  |
Total ending loan balance, net of accrued interest receivable |  | $ 1,715,324 |  | $ 1,659,704 |  |  |  |
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 |  | 1.61% |  | 1.05% |  |  |  |
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 |  | 1.61% |  | 1.05% |  |  |  |
Loans And Leases Receivable, Recorded Investment, Individually Evaluated for Impairment |  |  |  | $ 0 |  |  |  |
Recorded investment collectively evaluated for impairment |  |  |  | 1,664,214 |  |  |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net |  |  |  | 0 |  |  |  |
Recorded Investment |  |  |  | 1,664,214 |  |  |  |
Finance Leases Portfolio Segment [Member] |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |  |
Allowance for loan losses individually evaluated for impairment |  | $ 103 |  | 344 |  |  |  |
Allowance for loan losses collectively evaluated for impairment |  | 197 |  | 174 |  |  |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net |  | 0 |  | 0 |  |  |  |
Total ending allowance balance |  | 300 | $ 562 | 518 |  | $ 579 | $ 572 | $ 115
Loans individually evaluated for impairment |  | 1,406 |  | 1,595 |  |  |  |
Loans collectively evaluated for impairment |  | 20,177 |  | 22,731 |  |  |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance |  | 49 |  | 112 |  |  |  |
Total ending loan balance, net of accrued interest receivable |  | $ 21,632 |  | $ 24,438 |  |  |  |
Allowance for loan losses as a percentage of loan balance individually evaluated for impairment |  | 7.33% |  | 21.57% |  |  |  |
Allowance for loan losses as a percentage of loan balance collectively evaluated for impairment |  | 0.98% |  | 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 |  | 1.39% |  | 2.12% |  |  |  |
Loans And Leases Receivable, Recorded Investment, Individually Evaluated for Impairment |  |  |  | $ 1,595 |  |  |  |
Recorded investment collectively evaluated for impairment |  |  |  | 22,745 |  |  |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net |  |  |  | 112 |  |  |  |
Recorded Investment |  |  |  | $ 24,452 |  |  |  |
[1] | Included within each of commercial, financial and agricultural loans and commercial real estate loans is an immaterial amount of consumer loans that were not broken out by class.(2) Results for reporting periods beginning after January 1, 2021 are presented under ASC 326, while prior period amounts continue to be reported in accordance with previously applicable U.S. GAAP. Category was not broken out as a separate class at December 31, 2020.

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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=123409700&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=121614798&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=121614798&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=123409700&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=123409700&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=121614798&loc=d3e15032-111544 + Details
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