Loans and Leases - Concessions Granted on Accruing and Nonaccrual Loans Restructured (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020 USD ($) loan	Sep. 30, 2019 USD ($) loan	Sep. 30, 2020 USD ($) loan	Sep. 30, 2019 USD ($) loan
Accrual Troubled Debt Restructuring Loans [Member]
Concessions Granted On Accruing And Nonaccrual Loans Restructured [Abstract]
No. of loans | loan	0	0	0	1
Financing receivable modifications, recorded investments | $	$ 0	$ 0	$ 0	$ 55
Accrual Troubled Debt Restructuring Loans [Member] | Maturity Date Extension [Member]
Concessions Granted On Accruing And Nonaccrual Loans Restructured [Abstract]
No. of loans | loan	0	0	0	0
Financing receivable modifications, recorded investments | $	$ 0	$ 0	$ 0	$ 0
Accrual Troubled Debt Restructuring Loans [Member] | Amortization Period Extension [Member]
Concessions Granted On Accruing And Nonaccrual Loans Restructured [Abstract]
No. of loans | loan	0	0	0	1
Financing receivable modifications, recorded investments | $	$ 0	$ 0	$ 0	$ 55
Nonaccrual Troubled Debt Restructuring Loans [Member]
Concessions Granted On Accruing And Nonaccrual Loans Restructured [Abstract]
No. of loans | loan	1	1	2	4
Financing receivable modifications, recorded investments | $	$ 544	$ 19	$ 1,163	$ 2,288
Nonaccrual Troubled Debt Restructuring Loans [Member] | Maturity Date Extension [Member]
Concessions Granted On Accruing And Nonaccrual Loans Restructured [Abstract]
No. of loans | loan	0	1	0	1
Financing receivable modifications, recorded investments | $	$ 0	$ 19	$ 0	$ 19
Nonaccrual Troubled Debt Restructuring Loans [Member] | Amortization Period Extension [Member]
Concessions Granted On Accruing And Nonaccrual Loans Restructured [Abstract]
No. of loans | loan	1	0	2	3
Financing receivable modifications, recorded investments | $	$ 544	$ 0	$ 1,163	$ 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 | loan			0	1
Financing receivable modifications, recorded investments | $				$ 55
Real Estate Home Equity Secured For Personal Purpose [Member] | Accrual Troubled Debt Restructuring Loans [Member] | Maturity Date Extension [Member]
Concessions Granted On Accruing And Nonaccrual Loans Restructured [Abstract]
No. of loans | loan				0
Financing receivable modifications, recorded investments | $				$ 0
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 | loan				1
Financing receivable modifications, recorded investments | $				$ 55
Commercial Financial And Agricultural [Member] | Nonaccrual Troubled Debt Restructuring Loans [Member]
Concessions Granted On Accruing And Nonaccrual Loans Restructured [Abstract]
No. of loans | loan	0	1	1	3
Financing receivable modifications, recorded investments | $		$ 19	$ 619	$ 975
Commercial Financial And Agricultural [Member] | Nonaccrual Troubled Debt Restructuring Loans [Member] | Maturity Date Extension [Member]
Concessions Granted On Accruing And Nonaccrual Loans Restructured [Abstract]
No. of loans | loan		1	0	1
Financing receivable modifications, recorded investments | $		$ 19	$ 0	$ 19
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 | loan		0	1	2
Financing receivable modifications, recorded investments | $		$ 0	$ 619	$ 956
Real-Estate Commercial [Member] | Nonaccrual Troubled Debt Restructuring Loans [Member]
Concessions Granted On Accruing And Nonaccrual Loans Restructured [Abstract]
No. of loans | loan			0	1
Financing receivable modifications, recorded investments | $				$ 1,313
Real-Estate Commercial [Member] | Nonaccrual Troubled Debt Restructuring Loans [Member] | Maturity Date Extension [Member]
Concessions Granted On Accruing And Nonaccrual Loans Restructured [Abstract]
No. of loans | loan				0
Financing receivable modifications, recorded investments | $				$ 0
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 | loan				1
Financing receivable modifications, recorded investments | $				$ 1,313
Real Estate Residential Secured For Personal Purpose [Member] | Nonaccrual Troubled Debt Restructuring Loans [Member]
Concessions Granted On Accruing And Nonaccrual Loans Restructured [Abstract]
No. of loans | loan	1	0	1	0
Financing receivable modifications, recorded investments | $	$ 544		$ 544
Real Estate Residential Secured For Personal Purpose [Member] | Nonaccrual Troubled Debt Restructuring Loans [Member] | Maturity Date Extension [Member]
Concessions Granted On Accruing And Nonaccrual Loans Restructured [Abstract]
No. of loans | loan	0		0
Financing receivable modifications, recorded investments | $	$ 0		$ 0
Real Estate Residential Secured For Personal Purpose [Member] | Nonaccrual Troubled Debt Restructuring Loans [Member] | Amortization Period Extension [Member]
Concessions Granted On Accruing And Nonaccrual Loans Restructured [Abstract]
No. of loans | loan	1		1
Financing receivable modifications, recorded investments | $	$ 544		$ 544