Loans - Nonaccrual Loans and Loans Past Due over 90 Days Still Accruing Interest by Class of Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Financing Receivable, Past Due [Line Items]
Nonaccrual	$ 14,860	$ 14,262
Past Due Over 90 Days Still on Accrual	464	887
Commercial, industrial, and agricultural
Financing Receivable, Past Due [Line Items]
Nonaccrual	3,263	2,076
Past Due Over 90 Days Still on Accrual	248	487
Commercial mortgages
Financing Receivable, Past Due [Line Items]
Nonaccrual	6,219	6,329
Past Due Over 90 Days Still on Accrual	0	53
Residential real estate
Financing Receivable, Past Due [Line Items]
Nonaccrual	4,824	5,187
Past Due Over 90 Days Still on Accrual	195	299
Consumer
Financing Receivable, Past Due [Line Items]
Nonaccrual	554	670
Past Due Over 90 Days Still on Accrual	0	43
Credit Cards
Financing Receivable, Past Due [Line Items]
Nonaccrual	0	0
Past Due Over 90 Days Still on Accrual	$ 21	$ 5