v3.26.1
Fair Value Measurements - Financial Instruments (Details) - USD ($)
$ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Jun. 30, 2025
Dec. 31, 2024
Financial assets:        
Cash and cash equivalents $ 228,293 $ 209,057 $ 257,953 $ 205,869
Total available for sale debt securities 3,286,456 3,164,756    
Investment securities held to maturity, fair value 259,281 275,218    
FHLBNY stock 130,672 115,687    
Equity securities 20,108 19,875    
Loans, net of allowance for credit losses 19,866,574 19,334,004    
Derivative assets 111,396 105,260    
Financial liabilities:        
Certificates of deposit 3,443,503 3,287,276    
Total deposits 19,545,169 19,278,683    
Borrowings 2,407,532 2,111,955    
Subordinated debentures 409,065 406,582    
Derivative liabilities 111,809 106,445    
Quoted Prices in Active Markets for Identical Assets (Level 1)        
Financial assets:        
Cash and cash equivalents 228,293 211,484    
Total available for sale debt securities 194,235 266,744    
Investment securities held to maturity, fair value 0 0    
FHLBNY stock 130,672 115,687    
Equity securities 20,108 19,875    
Loans, net of allowance for credit losses 0 0    
Derivative assets 0 0    
Financial liabilities:        
Deposits other than certificates of deposits 16,101,666 15,991,407    
Certificates of deposit 0 0    
Total deposits 16,101,666 15,991,407    
Borrowings 0 0    
Subordinated debentures 0 0    
Derivative liabilities 0 0    
Significant Other Observable  Inputs (Level 2)        
Financial assets:        
Cash and cash equivalents 0 0    
Total available for sale debt securities 3,092,221 2,898,012    
Investment securities held to maturity, fair value 259,281 275,218    
FHLBNY stock 0 0    
Equity securities 0 0    
Loans, net of allowance for credit losses 0 0    
Derivative assets 116,674 105,734    
Financial liabilities:        
Deposits other than certificates of deposits 0 0    
Certificates of deposit 3,442,820 3,288,485    
Total deposits 3,442,820 3,288,485    
Borrowings 2,407,165 2,116,467    
Subordinated debentures 437,180 433,450    
Derivative liabilities 111,598 108,102    
Significant Unobservable Inputs (Level 3)        
Financial assets:        
Cash and cash equivalents 0 0    
Total available for sale debt securities 0 0    
Investment securities held to maturity, fair value 0 0    
FHLBNY stock 0 0    
Equity securities 0 0    
Loans, net of allowance for credit losses 19,818,268 19,421,891    
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    
U.S. Treasury obligations        
Financial assets:        
Total available for sale debt securities 194,235 266,744    
U.S. Treasury obligations | Quoted Prices in Active Markets for Identical Assets (Level 1)        
Financial assets:        
Total available for sale debt securities 194,235 266,744    
U.S. Treasury obligations | Significant Other Observable  Inputs (Level 2)        
Financial assets:        
Total available for sale debt securities 0 0    
U.S. Treasury obligations | Significant Unobservable Inputs (Level 3)        
Financial assets:        
Total available for sale debt securities 0 0    
Government-agency obligations        
Financial assets:        
Total available for sale debt securities 28,694 33,539    
Investment securities held to maturity, fair value 996 3,378    
Government-agency obligations | Quoted Prices in Active Markets for Identical Assets (Level 1)        
Financial assets:        
Total available for sale debt securities 0 0    
Investment securities held to maturity, fair value 0 0    
Government-agency obligations | Significant Other Observable  Inputs (Level 2)        
Financial assets:        
Total available for sale debt securities 28,694 33,539    
Investment securities held to maturity, fair value 996 3,378    
Government-agency obligations | Significant Unobservable Inputs (Level 3)        
Financial assets:        
Total available for sale debt securities 0 0    
Investment securities held to maturity, fair value 0 0    
Mortgage-backed securities        
Financial assets:        
Total available for sale debt securities 2,805,031 2,612,347    
Mortgage-backed securities | Quoted Prices in Active Markets for Identical Assets (Level 1)        
Financial assets:        
Total available for sale debt securities 0 0    
Mortgage-backed securities | Significant Other Observable  Inputs (Level 2)        
Financial assets:        
Total available for sale debt securities 2,805,031 2,612,347    
Mortgage-backed securities | Significant Unobservable Inputs (Level 3)        
Financial assets:        
Total available for sale debt securities 0 0    
Asset-backed securities        
Financial assets:        
Total available for sale debt securities 35,408 41,761    
Asset-backed securities | Quoted Prices in Active Markets for Identical Assets (Level 1)        
Financial assets:        
Total available for sale debt securities 0 0    
Asset-backed securities | Significant Other Observable  Inputs (Level 2)        
Financial assets:        
Total available for sale debt securities 35,408 41,761    
Asset-backed securities | Significant Unobservable Inputs (Level 3)        
Financial assets:        
Total available for sale debt securities 0 0    
State and municipal obligations        
Financial assets:        
Total available for sale debt securities 112,384 112,999    
Investment securities held to maturity, fair value 257,717 269,711    
State and municipal obligations | Quoted Prices in Active Markets for Identical Assets (Level 1)        
Financial assets:        
Total available for sale debt securities 0 0    
Investment securities held to maturity, fair value 0 0    
State and municipal obligations | Significant Other Observable  Inputs (Level 2)        
Financial assets:        
Total available for sale debt securities 112,384 112,999    
Investment securities held to maturity, fair value 257,717 269,711    
State and municipal obligations | Significant Unobservable Inputs (Level 3)        
Financial assets:        
Total available for sale debt securities 0 0    
Investment securities held to maturity, fair value 0 0    
Corporate obligations        
Financial assets:        
Total available for sale debt securities 110,704 97,366    
Investment securities held to maturity, fair value 568 2,129    
Corporate obligations | Quoted Prices in Active Markets for Identical Assets (Level 1)        
Financial assets:        
Total available for sale debt securities 0 0    
Investment securities held to maturity, fair value 0 0    
Corporate obligations | Significant Other Observable  Inputs (Level 2)        
Financial assets:        
Total available for sale debt securities 110,704 97,366    
Investment securities held to maturity, fair value 568 2,129    
Corporate obligations | Significant Unobservable Inputs (Level 3)        
Financial assets:        
Total available for sale debt securities 0 0    
Investment securities held to maturity, fair value 0 0    
Carrying value        
Financial assets:        
Cash and cash equivalents 228,293 211,484    
Total available for sale debt securities 3,286,456 3,164,756    
Investment securities held to maturity, fair value 266,224 282,127    
FHLBNY stock 130,672 115,687    
Equity securities 20,108 19,875    
Loans, net of allowance for credit losses 19,866,574 19,334,004    
Derivative assets 116,674 105,734    
Financial liabilities:        
Deposits other than certificates of deposits 16,101,666 15,991,407    
Certificates of deposit 3,443,503 3,287,276    
Total deposits 19,545,169 19,278,683    
Borrowings 2,407,532 2,111,955    
Subordinated debentures 409,065 406,582    
Derivative liabilities 111,598 108,102    
Carrying value | U.S. Treasury obligations        
Financial assets:        
Total available for sale debt securities 194,235 266,744    
Carrying value | Government-agency obligations        
Financial assets:        
Total available for sale debt securities 28,694 33,539    
Investment securities held to maturity, fair value 1,000 3,400    
Carrying value | Mortgage-backed securities        
Financial assets:        
Total available for sale debt securities 2,805,031 2,612,347    
Carrying value | Asset-backed securities        
Financial assets:        
Total available for sale debt securities 35,408 41,761    
Carrying value | State and municipal obligations        
Financial assets:        
Total available for sale debt securities 112,384 112,999    
Investment securities held to maturity, fair value 264,654 276,585    
Carrying value | Corporate obligations        
Financial assets:        
Total available for sale debt securities 110,704 97,366    
Investment securities held to maturity, fair value 570 2,142    
Fair value        
Financial assets:        
Cash and cash equivalents 228,293 211,484    
Total available for sale debt securities 3,286,456 3,164,756    
Investment securities held to maturity, fair value 259,281 275,218    
FHLBNY stock 130,672 115,687    
Equity securities 20,108 19,875    
Loans, net of allowance for credit losses 19,818,268 19,421,891    
Derivative assets 116,674 105,734    
Financial liabilities:        
Deposits other than certificates of deposits 16,101,666 15,991,407    
Certificates of deposit 3,442,820 3,288,485    
Total deposits 19,544,486 19,279,892    
Borrowings 2,407,165 2,116,467    
Subordinated debentures 437,180 433,450    
Derivative liabilities 111,598 108,102    
Fair value | U.S. Treasury obligations        
Financial assets:        
Total available for sale debt securities 194,235 266,744    
Fair value | Government-agency obligations        
Financial assets:        
Total available for sale debt securities 28,694 33,539    
Investment securities held to maturity, fair value 996 3,378    
Fair value | Mortgage-backed securities        
Financial assets:        
Total available for sale debt securities 2,805,031 2,612,347    
Fair value | Asset-backed securities        
Financial assets:        
Total available for sale debt securities 35,408 41,761    
Fair value | State and municipal obligations        
Financial assets:        
Total available for sale debt securities 112,384 112,999    
Investment securities held to maturity, fair value 257,717 269,711    
Fair value | Corporate obligations        
Financial assets:        
Total available for sale debt securities 110,704 97,366    
Investment securities held to maturity, fair value $ 568 $ 2,129