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Low Income Housing Tax Credits and Other Tax Credit Investments - Schedule of the Company's Investments in Low Income Housing Projects Accounted for Using the Proportional Amortization Method (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jul. 12, 2024
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Investments In Affordable Housing Projects [Line Items]            
Current recorded investment included in other assets   $ 224,166   $ 224,166   $ 221,190
Commitments to fund qualified affordable housing projects included in recorded investment noted above   108,642   108,642   $ 149,207
Tax credits and benefits recognized   5,837 $ 1,602 16,128 $ 8,169  
Amortization expense included in income tax expense   $ 4,068 $ 745 $ 13,230 $ 6,322  
Cambridge Bancorp            
Investments In Affordable Housing Projects [Line Items]            
Acquired investment in LIHTC projects $ 7,400