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Fair Value Measurements - Schedule of Financial Instruments, Carrying and Fair Values (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities, at fair value $ 1,105,489 $ 976,919
Investment securities held to maturity 450,965 453,629
FHLBNY stock 59,489 57,298
Equity securities, at fair value 971 825
Loans, net of allowance for credit losses 9,721,424 7,277,360
Certificates of deposit 1,094,174 734,027
Total deposits 9,837,829 7,102,609
Borrowings 1,175,972 1,125,146
Subordinated debentures 25,135 0
Level 1    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
FHLBNY stock   57,298
Equity securities, at fair value 971  
Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
FHLBNY stock   0
Equity securities, at fair value 0  
Level 3    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
FHLBNY stock   0
Equity securities, at fair value 0  
Mortgage-backed securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities, at fair value 938,413 947,430
Investment securities held to maturity 62  
Asset-backed securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities, at fair value 53,830  
State and municipal obligations    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities, at fair value 71,258 4,079
Corporate obligations    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities, at fair value 40,979 25,410
Carrying Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term investments 532,353 186,748
Available for sale debt securities, at fair value 1,105,489 976,919
Investment securities held to maturity 450,965 453,629
FHLBNY stock 59,489 57,298
Equity securities, at fair value 971 825
Loans, net of allowance for credit losses 9,721,424 7,277,360
Derivative assets 101,079 39,305
Deposits other than certificates of deposits 8,743,655 6,368,582
Certificates of deposit 1,094,174 734,027
Total deposits 9,837,829 7,102,609
Borrowings 1,175,972 1,125,146
Subordinated debentures 25,135  
Derivative liabilities 109,148 39,356
Carrying Value | Agency obligations    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities, at fair value 1,009  
Investment securities held to maturity 7,600 6,599
Carrying Value | Mortgage-backed securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities, at fair value 938,413 947,430
Investment securities held to maturity 62 118
Carrying Value | Asset-backed securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities, at fair value 53,830  
Carrying Value | State and municipal obligations    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities, at fair value 71,258 4,079
Investment securities held to maturity 433,589 437,074
Carrying Value | Corporate obligations    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities, at fair value 40,979 25,410
Investment securities held to maturity 9,714 9,838
Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term investments 532,353 186,748
Available for sale debt securities, at fair value 1,105,489 976,919
Investment securities held to maturity 472,451 467,966
FHLBNY stock 59,489 57,298
Equity securities, at fair value 971 825
Loans, net of allowance for credit losses 9,969,330 7,296,744
Derivative assets 101,079 39,305
Deposits other than certificates of deposits 8,743,655 6,368,582
Certificates of deposit 1,097,993 734,047
Total deposits 9,841,648 7,102,629
Borrowings 1,193,024 1,127,569
Subordinated debentures 24,375  
Derivative liabilities 109,148 39,356
Fair Value | Level 1    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term investments 532,353 186,748
Available for sale debt securities, at fair value 1,009 0
Investment securities held to maturity 7,601 6,601
FHLBNY stock 59,489  
Equity securities, at fair value   825
Loans, net of allowance for credit losses 0 0
Derivative assets 0 0
Deposits other than certificates of deposits 8,743,655 6,368,582
Certificates of deposit 0 0
Total deposits 8,743,655 6,368,582
Borrowings 0 0
Derivative liabilities 0 0
Fair Value | Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term investments 0 0
Available for sale debt securities, at fair value 1,104,480 976,919
Investment securities held to maturity 464,850 461,365
FHLBNY stock 0  
Equity securities, at fair value   0
Loans, net of allowance for credit losses 0 0
Derivative assets 101,079 39,305
Deposits other than certificates of deposits 0 0
Certificates of deposit 1,097,993 734,047
Total deposits 1,097,993 734,047
Borrowings 1,193,024 1,127,569
Subordinated debentures 24,375  
Derivative liabilities 109,148 39,356
Fair Value | Level 3    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Short-term investments 0 0
Available for sale debt securities, at fair value 0 0
Investment securities held to maturity 0 0
FHLBNY stock 0  
Equity securities, at fair value   0
Loans, net of allowance for credit losses 9,969,330 7,296,744
Derivative assets 0 0
Deposits other than certificates of deposits 0 0
Certificates of deposit 0 0
Total deposits 0 0
Borrowings 0 0
Derivative liabilities 0 0
Fair Value | Agency obligations    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities, at fair value 1,009  
Investment securities held to maturity 7,601 6,601
Fair Value | Agency obligations | Level 1    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities, at fair value 1,009  
Investment securities held to maturity 7,601 6,601
Fair Value | Agency obligations | Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities, at fair value 0  
Investment securities held to maturity 0 0
Fair Value | Agency obligations | Level 3    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities, at fair value 0  
Investment securities held to maturity 0 0
Fair Value | Mortgage-backed securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities, at fair value 938,413 947,430
Investment securities held to maturity 64 122
Fair Value | Mortgage-backed securities | Level 1    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities, at fair value 0 0
Investment securities held to maturity 0 0
Fair Value | Mortgage-backed securities | Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities, at fair value 938,413 947,430
Investment securities held to maturity 64 122
Fair Value | Mortgage-backed securities | Level 3    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities, at fair value 0 0
Investment securities held to maturity 0 0
Fair Value | Asset-backed securities    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities, at fair value 53,830  
Fair Value | Asset-backed securities | Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities, at fair value 53,830  
Fair Value | State and municipal obligations    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities, at fair value 71,258 4,079
Investment securities held to maturity 454,973 451,353
Fair Value | State and municipal obligations | Level 1    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities, at fair value 0 0
Investment securities held to maturity 0 0
Fair Value | State and municipal obligations | Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities, at fair value 71,258 4,079
Investment securities held to maturity 454,973 451,353
Fair Value | State and municipal obligations | Level 3    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities, at fair value 0 0
Investment securities held to maturity 0 0
Fair Value | Corporate obligations    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities, at fair value 40,979 25,410
Investment securities held to maturity 9,813 9,890
Fair Value | Corporate obligations | Level 1    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities, at fair value 0 0
Investment securities held to maturity 0 0
Fair Value | Corporate obligations | Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities, at fair value 40,979 25,410
Investment securities held to maturity 9,813 9,890
Fair Value | Corporate obligations | Level 3    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available for sale debt securities, at fair value 0 0
Investment securities held to maturity $ 0 $ 0