Basis of Presentation - Additional Information (Detail)		9 Months Ended
	Sep. 09, 2019 shares	Sep. 30, 2019 RetailBankingOffice
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Number of retail banking offices		33
HSB Insurance, Inc. [Member]
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Operations commenced date		Jun. 01, 2017
United Community [Member]
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Number of common stock shares issued | shares	0.3715
Ohio [Member]
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Number of retail banking offices		32
Pennsylvania [Member]
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Number of retail banking offices		1