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Securities - Additional Information (Details)
 9 Months Ended 12 Months Ended
Sep. 30, 2023
USD ($)
Security
Sep. 30, 2022
USD ($)
Dec. 31, 2022
USD ($)
Security
Schedule Of Available For Sale Securities [Line Items]      
Available For Sale Securities | Security 40   42
Held to maturity | Security 33   34
Sale of Held - to maturity Securities $ 0   $ 0
Sale of available-for-sale securities $ 0   $ 0
Number of available-for-sale securities matured or called | Security     2
Number of held to maturity securities matured or called | Security 1    
Available-for-sale securities matured     $ 5,400,000
Held-to-maturity securities matured $ 10,000,000    
Purchases of available-for-sale securities 0   58,400,000
Purchases of Held-to-maturity securities $ 0 $ 501,942,000 $ 528,900,000
Number of available-for-sale securities with unrealized loss positions | Security 40   42
Number of held-to-maturity securities with unrealized loss positions | Security 30   27
Held to maturity securities, amortized costs $ 471,065,000   $ 510,820,000
Available-for-sale securities, at fair value 116,753,000   129,505,000
FRBNY      
Schedule Of Available For Sale Securities [Line Items]      
Held to maturity securities, amortized costs $ 189,900,000    
Number of held-to-maturity securities | Security 14    
Number of available-for-sale securities | Security 26    
Available for sale securities fair value $ 90,700,000    
FHLBNY      
Schedule Of Available For Sale Securities [Line Items]      
Held to maturity securities, amortized costs     $ 194,900,000
Number of held-to-maturity securities | Security     6
Available-for-sale securities, at fair value     $ 0