Regulatory Matters (Narrative) (Details)		12 Months Ended
		Dec. 31, 2020 USD ($)	Sep. 30, 2020 USD ($)	Aug. 04, 2020 USD ($)	Dec. 31, 2019	Dec. 31, 2015
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Statutory Accounting Practices, Statutory Amount Available for Dividend Payments without Regulatory Approval		$ 103,800,000
Common Equity Tier 1 Risk-based Capital Ratio: Well Capitalized Minimum: Ratio		6.50%
Tier 1 Risk-based Capital Ratio: Well Capitalized Minimum: Ratio		8				6
Tier 1 Leverage Ratio: Well Capitalized Minimum: Ratio		5
Total Risk-based Capital Ratio: Well Capitalized Minimum: Ratio		10
Capital ratios, capital conservation buffer		2.50%
Subordinated Debt		$ 20,000,000		$ 20,000,000.0
Subordinated Debt, Current		15,000,000.0
Subordinated Long-term Debt, Noncurrent		$ 5,000,000.0
Unsecured Debt			$ 452,900,000
Debt Instrument, Redemption Period		5 years
Paycheck Protection Program, Risk-Weight For Risk-Based Capital Rules		0.00%
PPP Loans Pledged As Collateral		$ 0
Consolidated asset limit on small bank holding companies		$ 3,000,000,000
Subordinated Debt [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Debt Instrument, Redemption Period		5 years
Subordinated Debt [Member] | Call Date 1 [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Debt Instrument, Term		5 years
Debt Instrument, Interest Rate, Stated Percentage		5.00%
Subordinated Debt [Member] | Call Date 1 [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Debt Instrument, Basis Spread on Variable Rate		4.93%
Subordinated Debt [Member] | Call Date 2 [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Debt Instrument, Term		10 years
Debt Instrument, Interest Rate, Stated Percentage		5.25%
Subordinated Debt [Member] | Call Date 2 [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Debt Instrument, Basis Spread on Variable Rate		4.92%
Pennsylvania [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common Equity Tier 1 Risk-based Capital Ratio: Ratio		10
Tier One Leverage Capital to Average Assets		6
Bank [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Common Equity Tier 1 Risk-based Capital Ratio: Ratio	[1]	14.07			14.62
Tier One Leverage Capital to Average Assets	[2]	8.54			9.59
Common Equity Tier 1 Risk-based Capital Ratio: Well Capitalized Minimum: Ratio	[1]	6.50%			6.50%
Tier 1 Risk-based Capital Ratio: Well Capitalized Minimum: Ratio	[3]	8.00			8.00
Tier 1 Leverage Ratio: Well Capitalized Minimum: Ratio	[2]	5.00			5.00
Total Risk-based Capital Ratio: Well Capitalized Minimum: Ratio	[4]	10.00			10.00
Capital ratios, capital conservation buffer		7.33%
Total Risk-based Capital Ratio: Ratio	[4]	15.33			15.87

[1] Common equity Tier 1 capital / total risk-weighted assets

[2] Tier 1 capital / average quarterly assets

[3] Tier 1 capital / total risk-weighted assets

[4] Total risk-based capital / total risk-weighted assets