Loans and Leases - Collateral Dependent Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Financing Receivable, Allowance for Credit Loss [Line Items]
Total nonaccrual loans	$ 33,504	$ 31,692
Total nonaccrual loans (excluding leases)	33,498	31,485
Real Estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Total nonaccrual loans	32,604	30,009
Other
Financing Receivable, Allowance for Credit Loss [Line Items]
Total nonaccrual loans	894	1,194
None
Financing Receivable, Allowance for Credit Loss [Line Items]
Total nonaccrual loans	0	282
Commercial Financial And Agricultural [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Total nonaccrual loans	1,246	2,827
Commercial Financial And Agricultural [Member] | Real Estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Total nonaccrual loans	352	1,351
Commercial Financial And Agricultural [Member] | Other
Financing Receivable, Allowance for Credit Loss [Line Items]
Total nonaccrual loans	894	1,194
Commercial Financial And Agricultural [Member] | None
Financing Receivable, Allowance for Credit Loss [Line Items]
Total nonaccrual loans	0	282
Real-Estate Commercial [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Total nonaccrual loans	26,264	22,739
Real-Estate Commercial [Member] | Real Estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Total nonaccrual loans	26,264	22,739
Real-Estate Commercial [Member] | Other
Financing Receivable, Allowance for Credit Loss [Line Items]
Total nonaccrual loans	0	0
Real-Estate Commercial [Member] | None
Financing Receivable, Allowance for Credit Loss [Line Items]
Total nonaccrual loans	0	0
Real Estate Residential Secured For Business Purpose [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Total nonaccrual loans	3,045	2,786
Real Estate Residential Secured For Business Purpose [Member] | Real Estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Total nonaccrual loans	3,045	2,786
Real Estate Residential Secured For Business Purpose [Member] | Other
Financing Receivable, Allowance for Credit Loss [Line Items]
Total nonaccrual loans	0	0
Real Estate Residential Secured For Business Purpose [Member] | None
Financing Receivable, Allowance for Credit Loss [Line Items]
Total nonaccrual loans	0	0
Real Estate Residential Secured For Personal Purpose [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Total nonaccrual loans	2,160	2,086
Real Estate Residential Secured For Personal Purpose [Member] | Real Estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Total nonaccrual loans	2,160	2,086
Real Estate Residential Secured For Personal Purpose [Member] | Other
Financing Receivable, Allowance for Credit Loss [Line Items]
Total nonaccrual loans	0	0
Real Estate Residential Secured For Personal Purpose [Member] | None
Financing Receivable, Allowance for Credit Loss [Line Items]
Total nonaccrual loans	0	0
Real Estate Home Equity Secured For Personal Purpose [Member]
Financing Receivable, Allowance for Credit Loss [Line Items]
Total nonaccrual loans	783	1,047
Real Estate Home Equity Secured For Personal Purpose [Member] | Real Estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Total nonaccrual loans	783	1,047
Real Estate Home Equity Secured For Personal Purpose [Member] | Other
Financing Receivable, Allowance for Credit Loss [Line Items]
Total nonaccrual loans	0	0
Real Estate Home Equity Secured For Personal Purpose [Member] | None
Financing Receivable, Allowance for Credit Loss [Line Items]
Total nonaccrual loans	$ 0	$ 0