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Investment securities - Summary of Amortized Cost and Fair Value of Securities by Contractual Maturity (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Amortized Cost of Held-to-maturity Securities    
Amortized Cost, After one but within five years, Held to maturity $ 1,191  
Amortized Cost, After five but within ten years, Held to maturity 9,984  
Amortized Cost, Held to maturity 11,175  
Amortized Cost, Mortgage-backed securities, Held to maturity 68,686  
Held-to-maturity, Amortized Cost 79,861 $ 84,851
Fair Value of Held-to-maturity Securities    
Fair Value, After one but within five years, Held to maturity 1,096  
Fair Value, After five but within ten years, Held to maturity 9,244  
Fair Value, Held to maturity 10,340  
Fair Value, Mortgage-backed securities, Held to maturity 58,694  
Held to maturity, Fair Value $ 69,034 $ 71,698