Loans (Aging Of Past Due Loans) (Details) - USD ($) $ in Thousands		Jun. 30, 2021		Dec. 31, 2020
Financing Receivable, Past Due [Line Items]
Accruing loans past due 30-89 days		$ 13,423		$ 23,652
Loan balance		7,035,646		7,177,785
Financing Receivable Recorded Investment Ninety Days Or More Past Due And Accruing Plus Past Due Nonaccrual Loans		20,601	[1]	26,364	[2]
Impaired Financing Receivable, Recorded Investment, Nonaccrual loans which are current in regards to contractual P&I payments		76,700		92,600
Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss		7,001,622		7,148,422
Loan balance		7,035,646
Construction Real Estate Commercial [Domain]
Financing Receivable, Past Due [Line Items]
Accruing loans past due 30-89 days		815
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss		210,681
Financing Receivable Recorded Investment Ninety Days Or More Past Due And Accruing Plus Past Due Nonaccrual Loans	[2]			39
Construction Real Estate Commercial [Domain] | Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss		209,866		227,524
Loan balance		210,681
Commercial Financial And Agricultural [Member]
Financing Receivable, Past Due [Line Items]
Accruing loans past due 30-89 days				7,372
Financing Receivable Recorded Investment Ninety Days Or More Past Due And Accruing Plus Past Due Nonaccrual Loans	[2]			13,968
Commercial Financial And Agricultural [Member] | Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss				1,574,177
Construction Real Estate - Mortgage [Member]
Financing Receivable, Past Due [Line Items]
Accruing loans past due 30-89 days				77
Construction Real Estate - Mortgage [Member] | Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss				115,647
Construction Real Estate - Installment [Member]
Financing Receivable, Past Due [Line Items]
Accruing loans past due 30-89 days				12
Construction Real Estate - Installment [Member] | Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss				929
Residential Real Estate Commercial [Member]
Financing Receivable, Past Due [Line Items]
Accruing loans past due 30-89 days				17
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss		517,114
Financing Receivable Recorded Investment Ninety Days Or More Past Due And Accruing Plus Past Due Nonaccrual Loans		391	[1]	493	[2]
Residential Real Estate Commercial [Member] | Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss		516,723		526,873
Loan balance		517,114
Residential Real Estate - Mortgage [Member]
Financing Receivable, Past Due [Line Items]
Accruing loans past due 30-89 days		6,222		9,538
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss		1,062,865
Financing Receivable Recorded Investment Ninety Days Or More Past Due And Accruing Plus Past Due Nonaccrual Loans		6,321	[1]	7,814	[2]
Residential Real Estate - Mortgage [Member] | Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss		1,050,322		1,079,953
Loan balance		1,062,865
Residential Real Estate - HELOC [Member]
Financing Receivable, Past Due [Line Items]
Accruing loans past due 30-89 days		476		805
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss		167,522
Financing Receivable Recorded Investment Ninety Days Or More Past Due And Accruing Plus Past Due Nonaccrual Loans		979	[1]	810	[2]
Residential Real Estate - HELOC [Member] | Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss		166,067		181,060
Loan balance		167,522
Residential Real Estate - Installment [Member]
Financing Receivable, Past Due [Line Items]
Accruing loans past due 30-89 days		123		67
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss		6,911
Financing Receivable Recorded Investment Ninety Days Or More Past Due And Accruing Plus Past Due Nonaccrual Loans		54	[1]	71	[2]
Residential Real Estate - Installment [Member] | Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss		6,734		8,320
Loan balance		6,911
PPP loans receivable [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable Recorded Investment Ninety Days Or More Past Due And Accruing Plus Past Due Nonaccrual Loans		18
PPP loans receivable [Member] | Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss		248,862
Loan balance		248,880
Bank Overdrafts | Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss		1,536
Loan balance		1,536
Construction Real Estate Retail
Financing Receivable, Past Due [Line Items]
Accruing loans past due 30-89 days		36
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss		118,819
Construction Real Estate Retail | Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss		118,783
Loan balance		118,819
Commercial Real Estate [Member]
Financing Receivable, Past Due [Line Items]
Accruing loans past due 30-89 days		76		82
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss		1,777,806
Financing Receivable Recorded Investment Ninety Days Or More Past Due And Accruing Plus Past Due Nonaccrual Loans		722	[1]	972	[2]
Commercial Real Estate [Member] | Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss		1,777,008		1,753,152
Loan balance		1,777,806
Consumer [Member]
Financing Receivable, Past Due [Line Items]
Accruing loans past due 30-89 days				5,496
Financing Receivable Recorded Investment Ninety Days Or More Past Due And Accruing Plus Past Due Nonaccrual Loans	[2]			1,213
Consumer [Member] | Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss				1,657,505
Finance Leases Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Accruing loans past due 30-89 days		15		186
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss		22,673
Financing Receivable Recorded Investment Ninety Days Or More Past Due And Accruing Plus Past Due Nonaccrual Loans		37		984	[2]
Finance Leases Portfolio Segment [Member] | Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss		22,621		$ 23,282
Loan balance		22,673
PPP loans receivable [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss		248,880
GFSC loans
Financing Receivable, Past Due [Line Items]
Accruing loans past due 30-89 days		324
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss		3,750
Financing Receivable Recorded Investment Ninety Days Or More Past Due And Accruing Plus Past Due Nonaccrual Loans		130
GFSC loans | Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss		3,296
Loan balance		3,750
Check loans
Financing Receivable, Past Due [Line Items]
Accruing loans past due 30-89 days		6
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss		2,082
Check loans | Financial Asset, Not Past Due
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss		2,076
Loan balance		2,082
Bank Overdrafts
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss		$ 1,536

[1] 1) Includes an aggregate of $0.5 million of loans past due 90 days or more and accruing. The remaining loans were past due nonaccrual loans.(2) Includes an aggregate of $76.7 million of nonaccrual loans which were current in regards to contractual principal and interest payments

[2] 1) Includes an aggregate of $1.6 million of loans past due 90 days or more and accruing. The remaining loans were past due nonaccrual loans.    (2) Includes an aggregate of $92.6 million of nonaccrual loans which were current in regards to contractual principal and interest payments.