Loans and Leases - Nonperforming Loans and Leases (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Nonperforming Loans And Leases [Line Items]
Total nonaccrual loans and lease	$ 34,528	$ 31,692
Loans and lease 90 days or more past due and accruing interest	2,204	1,392
Financing Receivable, Nonaccrual Including Loans Held-for-Sale	34,528	31,692
Accruing Troubled Debt Restructured Loans And Lease Modifications, Including Loans Held-For-Sale	51	53
Financing Receivable, 90 Days Or More Past Due, Still Accruing, Including Loans Held-For-Sale	2,204	1,392
Financing Receivable Recorded Investment, Non Performing Loans And Leases, Including Loans Held-For-Sale	36,783	33,137
Nonaccrual troubled debt restructured loans and lease modifications	2,400	14,100
Commercial Financial And Agricultural [Member]
Nonperforming Loans And Leases [Line Items]
Total nonaccrual loans and lease	933	2,827
Accruing troubled debt restructured loans and lease modifications	0	0
Loans and lease 90 days or more past due and accruing interest	2,000	50
Total nonperforming loans and leases	2,933	2,877
Real-Estate Commercial [Member]
Nonperforming Loans And Leases [Line Items]
Total nonaccrual loans and lease	28,296	22,739
Accruing troubled debt restructured loans and lease modifications	0	0
Loans and lease 90 days or more past due and accruing interest	0	945
Total nonperforming loans and leases	28,296	23,684
Real Estate Residential Secured For Business Purpose [Member]
Nonperforming Loans And Leases [Line Items]
Total nonaccrual loans and lease	2,469	2,786
Accruing troubled debt restructured loans and lease modifications	0	0
Loans and lease 90 days or more past due and accruing interest	0	0
Total nonperforming loans and leases	2,469	2,786
Real Estate-Residential Secured For Personal Purpose [Member]
Nonperforming Loans And Leases [Line Items]
Total nonaccrual loans and lease	2,079	2,086
Accruing troubled debt restructured loans and lease modifications	0	0
Loans and lease 90 days or more past due and accruing interest	0	0
Total nonperforming loans and leases	2,079	2,086
Real Estate Home Equity Secured For Personal Purpose [Member]
Nonperforming Loans And Leases [Line Items]
Total nonaccrual loans and lease	721	1,047
Accruing troubled debt restructured loans and lease modifications	51	53
Loans and lease 90 days or more past due and accruing interest	0	0
Total nonperforming loans and leases	772	1,100
Loans to Individuals [Member]
Nonperforming Loans And Leases [Line Items]
Total nonaccrual loans and lease	0	0
Accruing troubled debt restructured loans and lease modifications	0	0
Loans and lease 90 days or more past due and accruing interest	58	185
Total nonperforming loans and leases	58	185
Lease Financings [Member]
Nonperforming Loans And Leases [Line Items]
Total nonaccrual loans and lease	30	207
Accruing troubled debt restructured loans and lease modifications	0	0
Loans and lease 90 days or more past due and accruing interest	146	212
Total nonperforming loans and leases	$ 176	$ 419