Consolidated Statements of Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Interest income:
Loans and leases: Taxable	$ 32,364	$ 29,155	$ 26,035
Loans and leases: Nontaxable	1,077	958	860
Interest-bearing deposits with financial institutions	47	104	48
Restricted regulatory securities	417	194	135
Investment securities:
U.S. government agency and corporations	3,633	3,314	2,515
States and political subdivisions (nontaxable)	1,731	1,594	1,449
Other securities		11	22
Total interest income	39,269	35,330	31,064
Interest expense:
Deposits	6,176	3,811	2,750
Securities sold under repurchase agreements		16	21
Other short-term borrowings and other	878	667	205
FHLB advances	500	379	247
Total interest expense	7,554	4,873	3,223
Net interest income	31,715	30,457	27,841
Provision for loan losses	1,085	1,450	1,450
Net interest income after provision for loan losses	30,630	29,007	26,391
Other income:
Earnings on bank-owned life insurance	647	598	581
Gain (loss) on write-down, sale or disposal of:
Loans	856	645	878
Available-for-sale debt securities	14	10	(147)
Equity securities		44
Premises and equipment	(13)	(18)	(164)
Total other income	10,193	9,200	8,367
Other expenses:
Salaries and employee benefits	14,761	13,678	13,072
Premises and equipment	4,124	3,775	3,838
Advertising and marketing	1,610	1,656	1,859
Professional services	1,362	1,606	1,863
Data processing and communication	1,765	1,470	1,233
Automated transaction processing	877	784	735
Merger-related expenses	440
Office supplies and postage	413	399	460
FDIC assessment	133	267	267
PA shares tax	303	242	262
Loan collection	264	132	224
Other real estate owned	121	177	200
Other	748	886	823
Total other expenses	26,921	25,072	24,836
Income before income taxes	13,902	13,135	9,922
Provision for income taxes	2,326	2,129	1,206
Net income	$ 11,576	$ 11,006	$ 8,716
Per share data:
Net income - basic	$ 3.06	$ 2.93	$ 2.35
Net income - diluted	3.03	2.90	2.33
Dividends	$ 1.06	$ 0.98	$ 0.88
Deposit Account [Member]
Other income:
Other income: revenues from contracts with customers	$ 2,286	$ 2,244	$ 2,227
Credit and Debit Card [Member]
Other income:
Other income: revenues from contracts with customers	2,208	2,051	1,756
Fiduciary and Trust [Member]
Other income:
Other income: revenues from contracts with customers	1,350	1,319	1,040
Investment Advisory, Management and Administrative Service [Member]
Other income:
Other income: revenues from contracts with customers	946	759	596
Loans [Member]
Other income:
Other income: revenues from contracts with customers	1,054	579	728
Financial Service, Other [Member]
Other income:
Other income: revenues from contracts with customers	$ 845	$ 969	$ 872