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Allowance For Credit Losses (Composition Of The Allowance For Loan Losses) (Details) - USD ($) | Sep. 30, 2022 | Jun. 30, 2022 | Dec. 31, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Dec. 31, 2020
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Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |
Allowance for loan losses individually evaluated for impairment |  | $ 1,750,000 |  | $ 1,616,000 |  |  |
Allowance for loan losses collectively evaluated for impairment |  | 82,211,000 |  | 81,581,000 |  |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net |  | 0 |  | 0 |  |  |
Total ending allowance balance |  | 83,961,000 | $ 81,448,000 | 83,197,000 | $ 88,129,000 | $ 83,577,000 | $ 85,675,000
Loans individually evaluated for impairment |  | 43,670,000 |  | 74,502,000 |  |  |
Loans collectively evaluated for impairment |  | 7,054,709,000 |  | 6,789,471,000 |  |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance |  | 4,867,000 |  | 7,149,000 |  |  |
Total ending loan balance, net of accrued interest receivable |  | $ 7,103,246,000 |  | $ 6,871,122,000 |  |  |
Allowance for loan losses as a percentage of loan balance individually evaluated for impairment |  | 4.01% |  | 2.17% |  |  |
Allowance for loan losses as a percentage of loan balance collectively evaluated for impairment |  | 1.17% |  | 1.20% |  |  |
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 |  | 1.18% |  | 1.21% |  |  |
Commercial Financial And Agricultural [Member] |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |
Allowance for loan losses individually evaluated for impairment |  | $ 579,000 |  | $ 1,385,000 |  |  |
Allowance for loan losses collectively evaluated for impairment |  | 12,298,000 |  | 12,640,000 |  |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net |  | 0 |  | 0 |  |  |
Total ending allowance balance |  | 12,877,000 | 12,747,000 | 14,025,000 | 15,976,000 | 15,222,000 | 25,608,000
Loans individually evaluated for impairment |  | 12,138,000 |  | 22,666,000 |  |  |
Loans collectively evaluated for impairment |  | 1,265,734,000 |  | 1,275,783,000 |  |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance |  | 121,000 |  | 177,000 |  |  |
Total ending loan balance, net of accrued interest receivable |  | $ 1,277,993,000 |  | $ 1,298,626,000 |  |  |
Allowance for loan losses as a percentage of loan balance individually evaluated for impairment |  | 4.77% |  | 6.11% |  |  |
Allowance for loan losses as a percentage of loan balance collectively evaluated for impairment |  | 0.97% |  | 0.99% |  |  |
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 |  | 1.01% |  | 1.08% |  |  |
Commercial Real Estate [Member] |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |
Allowance for loan losses individually evaluated for impairment |  | $ 1,153,000 |  | $ 188,000 |  |  |
Allowance for loan losses collectively evaluated for impairment |  | 19,569,000 |  | 25,278,000 |  |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net |  | 0 |  | 0 |  |  |
Total ending allowance balance |  | 20,722,000 | 22,339,000 | 25,466,000 | 26,168,000 | 22,749,000 | 23,480,000
Loans individually evaluated for impairment |  | 27,904,000 |  | 47,820,000 |  |  |
Loans collectively evaluated for impairment |  | 1,759,335,000 |  | 1,748,854,000 |  |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance |  | 3,562,000 |  | 5,118,000 |  |  |
Total ending loan balance, net of accrued interest receivable | [1] | $ 1,790,801,000 |  | $ 1,801,792,000 |  |  |
Allowance for loan losses as a percentage of loan balance individually evaluated for impairment |  | 4.13% |  | 0.39% |  |  |
Allowance for loan losses as a percentage of loan balance collectively evaluated for impairment |  | 1.11% |  | 1.45% |  |  |
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 |  | 1.16% |  | 1.41% |  |  |
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 |  | 4,498,000 |  | 5,758,000 |  |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net |  | 0 |  | 0 |  |  |
Total ending allowance balance |  | 4,498,000 | 4,391,000 | 5,758,000 | 6,264,000 | 5,670,000 | 7,288,000
Loans individually evaluated for impairment |  | 439,000 |  | 222,000 |  |  |
Loans collectively evaluated for impairment |  | 310,600,000 |  | 320,608,000 |  |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance |  | 668,000 |  | 956,000 |  |  |
Total ending loan balance, net of accrued interest receivable |  | $ 311,707,000 |  | $ 321,786,000 |  |  |
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 |  | 1.45% |  | 1.80% |  |  |
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 |  | 1.44% |  | 1.79% |  |  |
Residential 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 |  | 15,103,000 |  | 11,424,000 |  |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net |  | 0 |  | 0 |  |  |
Total ending allowance balance |  | 15,103,000 | 13,619,000 | 11,424,000 | 11,762,000 | 13,113,000 | 11,363,000
Loans individually evaluated for impairment |  | 2,154,000 |  | 2,606,000 |  |  |
Loans collectively evaluated for impairment |  | 1,758,695,000 |  | 1,735,226,000 |  |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance |  | 516,000 |  | 875,000 |  |  |
Total ending loan balance, net of accrued interest receivable |  | $ 1,761,365,000 |  | $ 1,738,707,000 |  |  |
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 |  | 0.86% |  | 0.66% |  |  |
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 |  | 0.86% |  | 0.66% |  |  |
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 |  | 30,563,000 |  | 26,286,000 |  |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net |  | 0 |  | 0 |  |  |
Total ending allowance balance |  | 30,563,000 | 28,149,000 | 26,286,000 | 27,659,000 | 26,261,000 | 17,418,000
Loans individually evaluated for impairment |  | 0 |  | 0 |  |  |
Loans collectively evaluated for impairment |  | 1,941,509,000 |  | 1,689,679,000 |  |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance |  | 0 |  | 0 |  |  |
Total ending loan balance, net of accrued interest receivable |  | $ 1,941,509,000 |  | $ 1,689,679,000 |  |  |
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 |  | 1.57% |  | 1.56% |  |  |
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 |  | 1.57% |  | 1.56% |  |  |
Finance Leases Portfolio Segment [Member] |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |  |  |  |
Allowance for loan losses individually evaluated for impairment |  | $ 18,000 |  | $ 43,000 |  |  |
Allowance for loan losses collectively evaluated for impairment |  | 180,000 |  | 195,000 |  |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net |  | 0 |  | 0 |  |  |
Total ending allowance balance |  | 198,000 | $ 203,000 | 238,000 | $ 300,000 | $ 562,000 | $ 518,000
Loans individually evaluated for impairment |  | 1,035,000 |  | 1,188,000 |  |  |
Loans collectively evaluated for impairment |  | 18,836,000 |  | 19,321,000 |  |  |
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance |  | 0 |  | 23,000 |  |  |
Total ending loan balance, net of accrued interest receivable |  | $ 19,871,000 |  | $ 20,532,000 |  |  |
Allowance for loan losses as a percentage of loan balance individually evaluated for impairment |  | 1.74% |  | 3.62% |  |  |
Allowance for loan losses as a percentage of loan balance collectively evaluated for impairment |  | 0.96% |  | 1.01% |  |  |
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 |  | 1.00% |  | 1.16% |  |  |
[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.

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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 https://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 https://asc.fasb.org/extlink&oid=121614798&loc=d3e15032-111544 + 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 https://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 https://asc.fasb.org/extlink&oid=121614798&loc=d3e15032-111544 + Details
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