Short-Term Borrowings and Long-Term Debt - Short-term borrowings (Details)	3 Months Ended
	Mar. 31, 2020 USD ($) item	Dec. 31, 2019 USD ($)
Short-Term Borrowings
Short term borrowings	$ 129,707,000	$ 123,676,000
Wealth Division
Short-Term Borrowings
Short term borrowings	$ 206,000	413,000
Federal funds purchased | Federal Home Loan Bank of Pittsburgh
Short-Term Borrowings
Number of borrowing facilities | item	2
Short term borrowings	$ 0	0
Federal funds purchased, facility one | Federal Home Loan Bank of Pittsburgh
Short-Term Borrowings
Maximum borrowing capacity	24,000,000
Federal funds purchased, facility two | Federal Home Loan Bank of Pittsburgh
Short-Term Borrowings
Maximum borrowing capacity	15,000,000
Federal Reserve discount window | Federal Home Loan Bank of Pittsburgh
Short-Term Borrowings
Maximum borrowing capacity	13,500,000
Short term borrowings	$ 10,000,000	0
Duration of debt (in months)	3 months
Interest rate (as a percent)	0.25%
Short-term borrowing with interest rate 0.36 % | Federal Home Loan Bank of Pittsburgh
Short-Term Borrowings
Short term borrowings	$ 77,300,000
Interest rate (as a percent)	0.36%
Short-term borrowing with interest rate 0.42% | Federal Home Loan Bank of Pittsburgh
Short-Term Borrowings
Short term borrowings	$ 3,800,000
Duration of debt (in months)	9 months
Interest rate (as a percent)	0.42%
Short-term borrowing with interest rate 2.76% | Federal Home Loan Bank of Pittsburgh
Short-Term Borrowings
Short term borrowings	$ 5,000,000	$ 5,000,000
Duration of debt (in months)	7 months
Interest rate (as a percent)	2.76%	2.76%
Short-term borrowing with interest rate 1.81% | Federal Home Loan Bank of Pittsburgh
Short-Term Borrowings
Short term borrowings		$ 102,300,000
Interest rate (as a percent)		1.81%
Short-term borrowing with interest rate 1.59% | Federal Home Loan Bank of Pittsburgh
Short-Term Borrowings
Short term borrowings	$ 5,100,000	$ 7,700,000
Duration of debt (in months)	9 months
Interest rate (as a percent)	1.59%	1.59%
Short-term borrowing with interest rate 1.59% | Federal Home Loan Bank of Pittsburgh
Short-Term Borrowings
Short term borrowings	$ 7,700,000	$ 5,100,000
Duration of debt (in months)	9 months
Interest rate (as a percent)	1.59%	1.59%
Short-term borrowing with interest rate 0.88% | Federal Home Loan Bank of Pittsburgh
Short-Term Borrowings
Short term borrowings	$ 10,200,000
Duration of debt (in months)	12 months
Interest rate (as a percent)	0.88%
Short-term borrowing with interest rate 0.79% | Federal Home Loan Bank of Pittsburgh
Short-Term Borrowings
Short term borrowings	$ 10,400,000
Duration of debt (in months)	12 months
Interest rate (as a percent)	0.79%
Short-term borrowing with interest rate 2.03% | Federal Home Loan Bank of Pittsburgh
Short-Term Borrowings
Short term borrowings		$ 3,100,000
Interest rate (as a percent)		2.03%