Proposed Merger With GNB Financial Services, INC. - Additional Information (Detail) - GNB Financial Services Inc [Member] - $ / shares	Sep. 18, 2021	Dec. 10, 2020
Proposed Merger With GNB Financial Inc [Line Items]
Business acquisition oppurtunity to receive in cash per share		$ 87.68
Business acquisition,share price		$ 7.3064
Business acquisition aggregate minimum percentage of acquiree common shres outstanding will be exchanged for acquirer common stock		80.00%
Subsequent Event [Member]
Proposed Merger With GNB Financial Inc [Line Items]
Merger completion date	Sep. 18, 2021