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Allowance For Loan Losses (Composition Of The Allowance For Loan Losses) (Details) - USD ($)
Sep. 30, 2019
Dec. 31, 2018
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.