Summary of Significant Accounting Policies (Details Textual)		12 Months Ended
	Jan. 01, 2021	Dec. 31, 2020 USD ($) Segment Location County_Economy	Dec. 31, 2019 USD ($) Reporting Segment	Jan. 01, 2019 USD ($)	Dec. 31, 2018 USD ($)
Summary of Significant Accounting Policies (Additional Textual) [Abstract]
Number of locations served by bank | Location		40
Purchased and sold period of federal fund		1 day
Delinquent period of loans after which interest income is discontinued		90 days
Number of county economy from which credit risk exposure effected | County_Economy		9
Percentage of portfolio loans secured by real estate		68.30%
Impairment on commercial and commercial real estate loans, threshold amount		$ 400,000
Impairment on consumer and residential real estate loans, threshold amount		250,000
Valuation allowance impairment against servicing assets		0	$ 0		$ 0
Other real estate owned		0	19,000
Restricted stock		$ 14,600,000	11,700,000
Recognized tax amount		50.00%
Charge accrued relating to pending settlement of legal contingency			505,000
Deposits with Federal Reserve Bank		$ 201,000,000.0	$ 36,100,000
Operating segments of business | Segment		2	3
ASU 2017-04
Summary of Significant Accounting Policies (Additional Textual) [Abstract]
Change in Accounting Principle, Accounting Standards Update, Adopted [true false]		true
Change in Accounting Principle, Accounting Standards Update, Adoption Date		Jan. 01, 2020
Change in Accounting Principle, Accounting Standards Update, Immaterial Effect [true false]		true
ASU 2016-02
Summary of Significant Accounting Policies (Additional Textual) [Abstract]
Change in Accounting Principle, Accounting Standards Update, Adopted [true false]		true
Change in Accounting Principle, Accounting Standards Update, Adoption Date		Jan. 01, 2019
Capitalization of leases as an asset				$ 3,600,000
Minimum | ASU 2016-13 | Subsequent Event
Summary of Significant Accounting Policies (Additional Textual) [Abstract]
Increase in percentage of allowance for loan losses	5.00%
Minimum | Core Deposits
Summary of Significant Accounting Policies (Textual) [Abstract]
Intangible assets amortized period		7 years
Minimum | Customer Relationships
Summary of Significant Accounting Policies (Textual) [Abstract]
Intangible assets amortized period		13 years
Maximum | ASU 2016-13 | Subsequent Event
Summary of Significant Accounting Policies (Additional Textual) [Abstract]
Increase in percentage of allowance for loan losses	10.00%
Maximum | Core Deposits
Summary of Significant Accounting Policies (Textual) [Abstract]
Intangible assets amortized period		8 years
Maximum | Customer Relationships
Summary of Significant Accounting Policies (Textual) [Abstract]
Intangible assets amortized period		15 years
Buildings | Minimum
Summary of Significant Accounting Policies (Textual) [Abstract]
Range of buildings and furniture depreciated		5 years
Buildings | Maximum
Summary of Significant Accounting Policies (Textual) [Abstract]
Range of buildings and furniture depreciated		40 years
Furniture Fixtures and Equipment | Minimum
Summary of Significant Accounting Policies (Textual) [Abstract]
Range of buildings and furniture depreciated		3 years
Furniture Fixtures and Equipment | Maximum
Summary of Significant Accounting Policies (Textual) [Abstract]
Range of buildings and furniture depreciated		10 years
Mortgage Servicing Rights
Summary of Significant Accounting Policies (Additional Textual) [Abstract]
Valuation allowance impairment against servicing assets		$ 0	$ 0
Residential Real Estate
Summary of Significant Accounting Policies (Textual) [Abstract]
Loan financing period		15 years
Southwestern Pennsylvania
Summary of Significant Accounting Policies (Additional Textual) [Abstract]
Number of locations served by bank | Location		1
NAI
Summary of Significant Accounting Policies (Additional Textual) [Abstract]
Number of reporting units | Reporting			1
Number of reportable segments | Segment			1