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Allowance For Loan Losses (Composition Of The Allowance For Loan Losses) (Details) - USD ($)
Mar. 31, 2019
Dec. 31, 2018
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for loan losses individually evaluated for impairment $ 2,468,000 $ 2,273,000
Allowance for loan losses collectively evaluated for impairment 50,900,000 49,239,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net 0 0
Total ending allowance balance 53,368,000 51,512,000
Loans individually evaluated for impairment 50,881,000 48,135,000
Loans collectively evaluated for impairment 5,686,517,000 5,640,054,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 3,362,000 3,943,000
Total ending loan balance, net of accrued interest receivable $ 5,740,760,000 $ 5,692,132,000
Allowance for loan losses as a percentage of loan balance individually evaluated for impairment 4.85% 4.72%
Allowance for loan losses as a percentage of loan balance collectively evaluated for impairment 0.90% 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 0.93% 0.90%
Recorded investment $ 50,907,000 $ 48,144,000
Recorded investment collectively evaluated for impairment 5,706,054,000 5,657,693,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net 3,372,000 3,961,000
Recorded Investment 5,760,333,000 5,709,798,000
Commercial Financial And Agricultural [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for loan losses individually evaluated for impairment 2,403,000 2,169,000
Allowance for loan losses collectively evaluated for impairment 14,934,000 14,608,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net 0 0
Total ending allowance balance 17,337,000 16,777,000
Loans individually evaluated for impairment 14,843,000 15,119,000
Loans collectively evaluated for impairment 1,071,519,000 1,057,520,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 328,000 147,000
Total ending loan balance, net of accrued interest receivable [1] $ 1,086,690,000 $ 1,072,786,000
Allowance for loan losses as a percentage of loan balance individually evaluated for impairment 16.19% 14.35%
Allowance for loan losses as a percentage of loan balance collectively evaluated for impairment 1.39% 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 1.60% 1.56%
Recorded investment $ 14,844,000 $ 15,120,000
Recorded investment collectively evaluated for impairment 1,077,090,000 1,062,121,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net 330,000 148,000
Recorded Investment [1] 1,092,264,000 1,077,389,000
Commercial Real Estate [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for loan losses individually evaluated for impairment 58,000 86,000
Allowance for loan losses collectively evaluated for impairment 10,135,000 9,682,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net 0 0
Total ending allowance balance 10,193,000 9,768,000
Loans individually evaluated for impairment 31,113,000 28,418,000
Loans collectively evaluated for impairment 1,292,777,000 1,251,579,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 3,004,000 3,048,000
Total ending loan balance, net of accrued interest receivable [1] $ 1,326,894,000 $ 1,283,045,000
Allowance for loan losses as a percentage of loan balance individually evaluated for impairment 0.19% 0.30%
Allowance for loan losses as a percentage of loan balance collectively evaluated for impairment 0.78% 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 0.77% 0.76%
Recorded investment $ 31,138,000 $ 28,426,000
Recorded investment collectively evaluated for impairment 1,297,573,000 1,256,310,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net 3,012,000 3,059,000
Recorded Investment [1] 1,331,723,000 1,287,795,000
Construction Real Estate [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 4,564,000 4,463,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net 0 0
Total ending allowance balance 4,564,000 4,463,000
Loans individually evaluated for impairment 2,880,000 1,866,000
Loans collectively evaluated for impairment 240,180,000 245,909,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 0 499,000
Total ending loan balance, net of accrued interest receivable $ 243,060,000 $ 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 1.90% 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 1.88% 1.80%
Recorded investment $ 2,879,000 $ 1,866,000
Recorded investment collectively evaluated for impairment 241,139,000 246,864,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net 0 503,000
Recorded Investment 244,018,000 249,233,000
Residential Real Estate [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Allowance for loan losses individually evaluated for impairment 7,000 18,000
Allowance for loan losses collectively evaluated for impairment 9,163,000 8,713,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net 0 0
Total ending allowance balance 9,170,000 8,731,000
Loans individually evaluated for impairment 2,045,000 2,732,000
Loans collectively evaluated for impairment 1,777,495,000 1,790,637,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 30,000 249,000
Total ending loan balance, net of accrued interest receivable $ 1,779,570,000 $ 1,793,618,000
Allowance for loan losses as a percentage of loan balance individually evaluated for impairment 0.34% 0.66%
Allowance for loan losses as a percentage of loan balance collectively evaluated for impairment 0.52% 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 0.52% 0.49%
Recorded investment $ 2,046,000 $ 2,732,000
Recorded investment collectively evaluated for impairment 1,781,828,000 1,794,207,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net 30,000 251,000
Recorded Investment 1,783,904,000 1,797,190,000
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 12,104,000 11,773,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net 0 0
Total ending allowance balance 12,104,000 11,773,000
Loans individually evaluated for impairment 0 0
Loans collectively evaluated for impairment 1,302,429,000 1,292,136,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 0 0
Total ending loan balance, net of accrued interest receivable $ 1,302,429,000 $ 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 0.93% 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 0.93% 0.91%
Recorded investment $ 0 $ 0
Recorded investment collectively evaluated for impairment 1,306,283,000 1,295,892,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net 0 0
Recorded Investment 1,306,283,000 1,295,892,000
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
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net 0 0
Total ending allowance balance 0 0
Loans individually evaluated for impairment 0 0
Loans collectively evaluated for impairment 2,117,000 2,273,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Outstanding Balance 0 0
Total ending loan balance, net of accrued interest receivable $ 2,117,000 $ 2,273,000
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 0.00% 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 0.00% 0.00%
Recorded investment $ 0 $ 0
Recorded investment collectively evaluated for impairment 2,141,000 2,299,000
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Carrying Amount, Net 0 0
Recorded Investment 2,141,000 2,299,000
Purchased credit impaired [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans and Leases Receivable, Gross 3,372,000 3,961,000
Purchased credit impaired [Member] | Commercial Real Estate [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans and Leases Receivable, Gross [2] 3,012,000 3,059,000
Purchased credit impaired [Member] | Leases [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans and Leases Receivable, Gross 0 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 Losses [Line Items]    
Allowance for loan losses individually evaluated for impairment 0 0
Loans and Leases Receivable, Gross 924,000 475,000
Recorded Investment $ 925,000 $ 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.