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Fair Value Measurements - Financial Instruments, Carrying and Fair Values (Details) - USD ($)
$ in Thousands
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Financial assets:        
Cash and cash equivalents $ 209,057 $ 205,869 $ 180,185 $ 186,438
Available for sale debt securities, at fair value 3,164,756 2,768,915    
Held-to-maturity, debt securities 275,218 313,733    
Equity Securities 19,875 19,110    
Loans, net of allowance for credit losses 19,334,004 18,628,391    
Derivative assets 105,260 179,332    
Financial liabilities:        
Certificates of deposit 3,287,276 3,168,155    
Total deposits 19,278,683 18,623,813    
Borrowings 2,111,955 2,020,435    
Subordinated debentures 406,582 401,608    
Derivative liabilities 106,445 174,548    
U.S. Treasury obligations        
Financial assets:        
Available for sale debt securities, at fair value 266,744 330,598    
Government-agency obligations        
Financial assets:        
Available for sale debt securities, at fair value 33,539 107,235    
Held-to-maturity, debt securities 3,378 9,707    
Mortgage-backed securities        
Financial assets:        
Available for sale debt securities, at fair value 2,612,347 2,062,159    
Asset-backed securities        
Financial assets:        
Available for sale debt securities, at fair value 41,761 47,563    
State and municipal obligations        
Financial assets:        
Available for sale debt securities, at fair value 112,999 116,917    
Held-to-maturity, debt securities 269,711 297,674    
Corporate obligations        
Financial assets:        
Available for sale debt securities, at fair value 97,366 104,443    
Held-to-maturity, debt securities 2,129 6,352    
Quoted Prices in Active Markets for Identical Assets (Level 1)        
Financial assets:        
Cash and cash equivalents 211,484 205,939    
Available for sale debt securities, at fair value 266,744 330,598    
Held-to-maturity, debt securities 0 0    
FHLBNY and other stock 115,687 112,767    
Equity Securities 19,875 19,110    
Loans, net of allowance for credit losses 0 0    
Derivative assets 0 0    
Financial liabilities:        
Deposits other than certificates of deposits 15,991,407 15,455,658    
Certificates of deposit 0 0    
Total deposits 15,991,407 15,455,658    
Borrowings 0 0    
Subordinated debentures 0 0    
Derivative liabilities 0 0    
Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. Treasury obligations        
Financial assets:        
Available for sale debt securities, at fair value 266,744 330,598    
Quoted Prices in Active Markets for Identical Assets (Level 1) | Government-agency obligations        
Financial assets:        
Available for sale debt securities, at fair value 0 0    
Held-to-maturity, debt securities 0 0    
Quoted Prices in Active Markets for Identical Assets (Level 1) | Mortgage-backed securities        
Financial assets:        
Available for sale debt securities, at fair value 0 0    
Quoted Prices in Active Markets for Identical Assets (Level 1) | Asset-backed securities        
Financial assets:        
Available for sale debt securities, at fair value 0 0    
Quoted Prices in Active Markets for Identical Assets (Level 1) | State and municipal obligations        
Financial assets:        
Available for sale debt securities, at fair value 0 0    
Held-to-maturity, debt securities 0 0    
Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate obligations        
Financial assets:        
Available for sale debt securities, at fair value 0 0    
Held-to-maturity, debt securities 0 0    
Significant Other Observable Inputs (Level 2)        
Financial assets:        
Cash and cash equivalents 0 0    
Available for sale debt securities, at fair value 2,898,012 2,438,317    
Held-to-maturity, debt securities 275,218 313,733    
FHLBNY and other stock 0 0    
Equity Securities 0 0    
Loans, net of allowance for credit losses 0 0    
Derivative assets 105,734 188,940    
Financial liabilities:        
Deposits other than certificates of deposits 0 0    
Certificates of deposit 3,288,485 3,168,216    
Total deposits 3,288,485 3,168,216    
Borrowings 2,116,467 2,017,013    
Subordinated debentures 433,450 423,675    
Derivative liabilities 108,102 172,601    
Significant Other Observable Inputs (Level 2) | U.S. Treasury obligations        
Financial assets:        
Available for sale debt securities, at fair value 0 0    
Significant Other Observable Inputs (Level 2) | Government-agency obligations        
Financial assets:        
Available for sale debt securities, at fair value 33,539 107,235    
Held-to-maturity, debt securities 3,378 9,707    
Significant Other Observable Inputs (Level 2) | Mortgage-backed securities        
Financial assets:        
Available for sale debt securities, at fair value 2,612,347 2,062,159    
Significant Other Observable Inputs (Level 2) | Asset-backed securities        
Financial assets:        
Available for sale debt securities, at fair value 41,761 47,563    
Significant Other Observable Inputs (Level 2) | State and municipal obligations        
Financial assets:        
Available for sale debt securities, at fair value 112,999 116,917    
Held-to-maturity, debt securities 269,711 297,674    
Significant Other Observable Inputs (Level 2) | Corporate obligations        
Financial assets:        
Available for sale debt securities, at fair value 97,366 104,443    
Held-to-maturity, debt securities 2,129 6,352    
Significant Unobservable Inputs (Level 3)        
Financial assets:        
Cash and cash equivalents 0 0    
Available for sale debt securities, at fair value 0 0    
Held-to-maturity, debt securities 0 0    
FHLBNY and other stock 0 0    
Equity Securities 0 0    
Loans, net of allowance for credit losses 19,421,891 18,442,167    
Derivative assets 0 0    
Financial liabilities:        
Deposits other than certificates of deposits 0 0    
Certificates of deposit 0 0    
Total deposits 0 0    
Borrowings 0 0    
Subordinated debentures 0 0    
Derivative liabilities 0 0    
Significant Unobservable Inputs (Level 3) | U.S. Treasury obligations        
Financial assets:        
Available for sale debt securities, at fair value 0 0    
Significant Unobservable Inputs (Level 3) | Government-agency obligations        
Financial assets:        
Available for sale debt securities, at fair value 0 0    
Held-to-maturity, debt securities 0 0    
Significant Unobservable Inputs (Level 3) | Mortgage-backed securities        
Financial assets:        
Available for sale debt securities, at fair value 0 0    
Significant Unobservable Inputs (Level 3) | Asset-backed securities        
Financial assets:        
Available for sale debt securities, at fair value 0 0    
Significant Unobservable Inputs (Level 3) | State and municipal obligations        
Financial assets:        
Available for sale debt securities, at fair value 0 0    
Held-to-maturity, debt securities 0 0    
Significant Unobservable Inputs (Level 3) | Corporate obligations        
Financial assets:        
Available for sale debt securities, at fair value 0 0    
Held-to-maturity, debt securities 0 0    
Carrying Value        
Financial assets:        
Cash and cash equivalents 211,484 205,939    
Available for sale debt securities, at fair value 3,164,756 2,768,915    
Held-to-maturity, debt securities 282,127 327,623    
FHLBNY and other stock 115,687 112,767    
Equity Securities 19,875 19,110    
Loans, net of allowance for credit losses 19,334,004 18,628,391    
Derivative assets 105,734 188,940    
Financial liabilities:        
Deposits other than certificates of deposits 15,991,407 15,455,658    
Certificates of deposit 3,287,276 3,168,155    
Total deposits 19,278,683 18,623,813    
Borrowings 2,111,955 2,020,435    
Subordinated debentures 406,582 401,608    
Derivative liabilities 108,102 172,601    
Carrying Value | U.S. Treasury obligations        
Financial assets:        
Available for sale debt securities, at fair value 266,744 330,598    
Carrying Value | Government-agency obligations        
Financial assets:        
Available for sale debt securities, at fair value 33,539 107,235    
Held-to-maturity, debt securities 3,400 9,999    
Carrying Value | Mortgage-backed securities        
Financial assets:        
Available for sale debt securities, at fair value 2,612,347 2,062,159    
Carrying Value | Asset-backed securities        
Financial assets:        
Available for sale debt securities, at fair value 41,761 47,563    
Carrying Value | State and municipal obligations        
Financial assets:        
Available for sale debt securities, at fair value 112,999 116,917    
Held-to-maturity, debt securities 276,585 311,106    
Carrying Value | Corporate obligations        
Financial assets:        
Available for sale debt securities, at fair value 97,366 104,443    
Held-to-maturity, debt securities 2,142 6,518    
Fair Value        
Financial assets:        
Cash and cash equivalents 211,484 205,939    
Available for sale debt securities, at fair value 3,164,756 2,768,915    
Held-to-maturity, debt securities 275,218 313,733    
FHLBNY and other stock 115,687 112,767    
Equity Securities 19,875 19,110    
Loans, net of allowance for credit losses 19,421,891 18,442,167    
Derivative assets 105,734 188,940    
Financial liabilities:        
Deposits other than certificates of deposits 15,991,407 15,455,658    
Certificates of deposit 3,288,485 3,168,216    
Total deposits 19,279,892 18,623,874    
Borrowings 2,116,467 2,017,013    
Subordinated debentures 433,450 423,675    
Derivative liabilities 108,102 172,601    
Fair Value | U.S. Treasury obligations        
Financial assets:        
Available for sale debt securities, at fair value 266,744 330,598    
Fair Value | Government-agency obligations        
Financial assets:        
Available for sale debt securities, at fair value 33,539 107,235    
Held-to-maturity, debt securities 3,378 9,707    
Fair Value | Mortgage-backed securities        
Financial assets:        
Available for sale debt securities, at fair value 2,612,347 2,062,159    
Fair Value | Asset-backed securities        
Financial assets:        
Available for sale debt securities, at fair value 41,761 47,563    
Fair Value | State and municipal obligations        
Financial assets:        
Available for sale debt securities, at fair value 112,999 116,917    
Held-to-maturity, debt securities 269,711 297,674    
Fair Value | Corporate obligations        
Financial assets:        
Available for sale debt securities, at fair value 97,366 104,443    
Held-to-maturity, debt securities $ 2,129 $ 6,352