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Segment Information - Information about Company's Segments (Parenthetical) (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Segment Reporting Information [Line Items]          
Taxable-equivalent adjustment $ 13,886,000 $ 10,726,000 $ 27,348,000 $ 13,960,000  
Average total assets 203,492,000 180,414,000 203,492,000 180,414,000 $ 190,252,000
Commercial Banking [Member]          
Segment Reporting Information [Line Items]          
Average total assets 49,166,000 35,696,000 49,166,000 35,696,000 40,930,000
Hospitality [Member]          
Segment Reporting Information [Line Items]          
Average total assets   1,250,000   1,250,000  
Retail Banking [Member]          
Segment Reporting Information [Line Items]          
Average total assets 21,322,000 19,690,000 21,322,000 19,690,000 20,312,000
Retail Banking [Member] | Peoples United Financial Inc [Member]          
Segment Reporting Information [Line Items]          
Average total assets   4,720,000   4,720,000  
Other Segments [Member]          
Segment Reporting Information [Line Items]          
Average total assets $ 39,446,000 47,374,000 $ 39,446,000 47,374,000 $ 44,171,000
Other Segments [Member] | Peoples United Financial Inc [Member]          
Segment Reporting Information [Line Items]          
Average total assets   $ 591,000   $ 591,000