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Fair Value Measurements - Financial Instruments, Carrying and Fair Values (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Financial assets:        
Cash and cash equivalents $ 205,869 $ 180,185 $ 186,438 $ 685,163
Available for sale debt securities, at fair value 2,768,915 1,690,112    
Held-to-maturity, debt securities 313,733 352,601    
Equity Securities 19,110 1,270    
Loans, net of allowance for credit losses 18,628,391 10,766,501    
Derivative assets 179,332 105,164    
Financial liabilities:        
Certificates of deposit 3,168,155 1,095,942    
Total deposits 18,623,813 10,292,514    
Borrowings 2,020,435 1,970,033    
Subordinated debentures 401,608 10,695    
Derivative liabilities 174,548 90,834    
U.S. Treasury obligations        
Financial assets:        
Available for sale debt securities, at fair value 330,598 253,878    
Held-to-maturity, debt securities   5,147    
Government-agency obligations        
Financial assets:        
Available for sale debt securities, at fair value 107,235 27,498    
Held-to-maturity, debt securities 9,707 10,406    
Mortgage-backed securities        
Financial assets:        
Available for sale debt securities, at fair value 2,062,159 1,285,609    
Asset-backed securities        
Financial assets:        
Available for sale debt securities, at fair value 47,563 32,235    
State and municipal obligations        
Financial assets:        
Available for sale debt securities, at fair value 116,917 56,584    
Held-to-maturity, debt securities 297,674 330,360    
Corporate obligations        
Financial assets:        
Available for sale debt securities, at fair value 104,443 34,308    
Held-to-maturity, debt securities 6,352 6,688    
Quoted Prices in Active Markets for Identical Assets (Level 1)        
Financial assets:        
Cash and cash equivalents 205,939 180,255    
Available for sale debt securities, at fair value 330,598 253,878    
Held-to-maturity, debt securities 0 15,552    
FHLBNY and other stock 112,767 79,217    
Equity Securities 19,110 1,270    
Loans, net of allowance for credit losses 0 0    
Derivative assets 0 0    
Financial liabilities:        
Deposits other than certificates of deposits 15,455,658 9,196,572    
Certificates of deposit 0 0    
Total deposits 15,455,658 9,196,572    
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 330,598 253,878    
Held-to-maturity, debt securities   5,146    
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 10,406    
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 2,438,317 1,436,234    
Held-to-maturity, debt securities 313,733 337,048    
FHLBNY and other stock 0 0    
Equity Securities 0 0    
Loans, net of allowance for credit losses 0 0    
Derivative assets 188,940 101,754    
Financial liabilities:        
Deposits other than certificates of deposits 0 0    
Certificates of deposit 3,168,216 1,093,125    
Total deposits 3,168,216 1,093,125    
Borrowings 2,017,013 1,960,174    
Subordinated debentures 423,675 9,198    
Derivative liabilities 172,601 88,835    
Significant Other Observable Inputs (Level 2) | U.S. Treasury obligations        
Financial assets:        
Available for sale debt securities, at fair value 0 0    
Held-to-maturity, debt securities   0    
Significant Other Observable Inputs (Level 2) | Government-agency obligations        
Financial assets:        
Available for sale debt securities, at fair value 107,235 27,498    
Held-to-maturity, debt securities 9,707 0    
Significant Other Observable Inputs (Level 2) | Mortgage-backed securities        
Financial assets:        
Available for sale debt securities, at fair value 2,062,159 1,285,609    
Significant Other Observable Inputs (Level 2) | Asset-backed securities        
Financial assets:        
Available for sale debt securities, at fair value 47,563 32,235    
Significant Other Observable Inputs (Level 2) | State and municipal obligations        
Financial assets:        
Available for sale debt securities, at fair value 116,917 56,584    
Held-to-maturity, debt securities 297,674 330,360    
Significant Other Observable Inputs (Level 2) | Corporate obligations        
Financial assets:        
Available for sale debt securities, at fair value 104,443 34,308    
Held-to-maturity, debt securities 6,352 6,688    
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 18,442,167 10,437,204    
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    
Held-to-maturity, debt securities   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 205,939 180,255    
Available for sale debt securities, at fair value 2,768,915 1,690,112    
Held-to-maturity, debt securities 327,623 363,080    
FHLBNY and other stock 112,767 79,217    
Equity Securities 19,110 1,270    
Loans, net of allowance for credit losses 18,628,391 10,766,501    
Derivative assets 188,940 101,754    
Financial liabilities:        
Deposits other than certificates of deposits 15,455,658 9,196,572    
Certificates of deposit 3,168,155 1,095,942    
Total deposits 18,623,813 10,292,514    
Borrowings 2,020,435 1,970,033    
Subordinated debentures 401,608 10,695    
Derivative liabilities 172,601 88,835    
Carrying Value | U.S. Treasury obligations        
Financial assets:        
Available for sale debt securities, at fair value 330,598 253,878    
Held-to-maturity, debt securities   5,146    
Carrying Value | Government-agency obligations        
Financial assets:        
Available for sale debt securities, at fair value 107,235 27,498    
Held-to-maturity, debt securities 9,999 11,058    
Carrying Value | Mortgage-backed securities        
Financial assets:        
Available for sale debt securities, at fair value 2,062,159 1,285,609    
Carrying Value | Asset-backed securities        
Financial assets:        
Available for sale debt securities, at fair value 47,563 32,235    
Carrying Value | State and municipal obligations        
Financial assets:        
Available for sale debt securities, at fair value 116,917 56,584    
Held-to-maturity, debt securities 311,106 339,789    
Carrying Value | Corporate obligations        
Financial assets:        
Available for sale debt securities, at fair value 104,443 34,308    
Held-to-maturity, debt securities 6,518 7,087    
Fair Value        
Financial assets:        
Cash and cash equivalents 205,939 180,255    
Available for sale debt securities, at fair value 2,768,915 1,690,112    
Held-to-maturity, debt securities 313,733 352,600    
FHLBNY and other stock 112,767 79,217    
Equity Securities 19,110 1,270    
Loans, net of allowance for credit losses 18,442,167 10,437,204    
Derivative assets 188,940 101,754    
Financial liabilities:        
Deposits other than certificates of deposits 15,455,658 9,196,572    
Certificates of deposit 3,168,216 1,093,125    
Total deposits 18,623,874 10,289,697    
Borrowings 2,017,013 1,960,174    
Subordinated debentures 423,675 9,198    
Derivative liabilities 172,601 88,835    
Fair Value | U.S. Treasury obligations        
Financial assets:        
Available for sale debt securities, at fair value 330,598 253,878    
Held-to-maturity, debt securities   5,146    
Fair Value | Government-agency obligations        
Financial assets:        
Available for sale debt securities, at fair value 107,235 27,498    
Held-to-maturity, debt securities 9,707 10,406    
Fair Value | Mortgage-backed securities        
Financial assets:        
Available for sale debt securities, at fair value 2,062,159 1,285,609    
Fair Value | Asset-backed securities        
Financial assets:        
Available for sale debt securities, at fair value 47,563 32,235    
Fair Value | State and municipal obligations        
Financial assets:        
Available for sale debt securities, at fair value 116,917 56,584    
Held-to-maturity, debt securities 297,674 330,360    
Fair Value | Corporate obligations        
Financial assets:        
Available for sale debt securities, at fair value 104,443 34,308    
Held-to-maturity, debt securities $ 6,352 $ 6,688