Loans and Leases - Concessions Granted on Accruing and Nonaccrual Loans Restructured (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020 USD ($) loan	Jun. 30, 2019 USD ($) loan	Jun. 30, 2020 USD ($) loan	Jun. 30, 2019 USD ($) loan
Accrual Troubled Debt Restructuring Loans [Member]
Concessions Granted On Accruing And Nonaccrual Loans Restructured [Abstract]
No. of loans	0	1	0	1
Accrual Troubled Debt Restructuring Loans [Member] | Amortization Period Extension [Member]
Concessions Granted On Accruing And Nonaccrual Loans Restructured [Abstract]
No. of loans	0	1	0	1
Financing receivable modifications, recorded investments | $	$ 0	$ 55	$ 0	$ 55
Nonaccrual Troubled Debt Restructuring Loans [Member]
Concessions Granted On Accruing And Nonaccrual Loans Restructured [Abstract]
No. of loans	1	0	1	3
Nonaccrual Troubled Debt Restructuring Loans [Member] | Amortization Period Extension [Member]
Concessions Granted On Accruing And Nonaccrual Loans Restructured [Abstract]
No. of loans	1	0	1	3
Financing receivable modifications, recorded investments | $	$ 619	$ 0	$ 619	$ 2,269
Real Estate Home Equity Secured For Personal Purpose [Member] | Accrual Troubled Debt Restructuring Loans [Member]
Concessions Granted On Accruing And Nonaccrual Loans Restructured [Abstract]
No. of loans	0	1	0	1
Real Estate Home Equity Secured For Personal Purpose [Member] | Accrual Troubled Debt Restructuring Loans [Member] | Amortization Period Extension [Member]
Concessions Granted On Accruing And Nonaccrual Loans Restructured [Abstract]
No. of loans		1		1
Financing receivable modifications, recorded investments | $		$ 55		$ 55
Commercial Financial And Agricultural [Member] | Nonaccrual Troubled Debt Restructuring Loans [Member]
Concessions Granted On Accruing And Nonaccrual Loans Restructured [Abstract]
No. of loans	1	0	1	2
Commercial Financial And Agricultural [Member] | Nonaccrual Troubled Debt Restructuring Loans [Member] | Amortization Period Extension [Member]
Concessions Granted On Accruing And Nonaccrual Loans Restructured [Abstract]
No. of loans	1		1	2
Financing receivable modifications, recorded investments | $	$ 619		$ 619	$ 956
Real-Estate Commercial [Member] | Nonaccrual Troubled Debt Restructuring Loans [Member]
Concessions Granted On Accruing And Nonaccrual Loans Restructured [Abstract]
No. of loans			0	1
Real-Estate Commercial [Member] | Nonaccrual Troubled Debt Restructuring Loans [Member] | Amortization Period Extension [Member]
Concessions Granted On Accruing And Nonaccrual Loans Restructured [Abstract]
No. of loans				1
Financing receivable modifications, recorded investments | $				$ 1,313