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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Securities available for sale $ 5,844,909 [1] $ 5,885,887 [2]
Total equity securities 31,576 32,830
Total securities 5,844,909 5,885,887
Asset-backed Securities    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Securities available for sale [3] 527,099 373,254
Mutual Funds and Common Stock    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Securities available for sale [4]   17,416
Mutual Funds    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Securities available for sale 16,083  
Fair Value, Measurements, Recurring    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Securities available for sale 5,813,333 5,853,057
Total equity securities 31,576 32,830
Total securities 5,844,909 5,885,887
Fair Value, Measurements, Recurring | Preferred Stock (Par Value: $0.01)    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total equity securities 15,493 15,414
Fair Value, Measurements, Recurring | Mutual Funds and Common Stock    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total equity securities   17,416
Fair Value, Measurements, Recurring | Mutual Funds    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total equity securities 16,083  
Fair Value, Measurements, Recurring | Mortgage-Related Securities    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Securities available for sale 3,038,325 3,353,735
Fair Value, Measurements, Recurring | Mortgage-Related Securities | GSE Certificates    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Securities available for sale 1,209,610 1,552,623
Fair Value, Measurements, Recurring | Mortgage-Related Securities | GSE CMOs    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Securities available for sale 1,828,715 1,801,112
Fair Value, Measurements, Recurring | Other Securities    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Securities available for sale 2,775,008 2,499,322
Fair Value, Measurements, Recurring | Other Securities | U. S. Treasury Obligations    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Securities available for sale 64,985 41,839
Fair Value, Measurements, Recurring | Other Securities | GSE Debentures    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Securities available for sale 1,158,302 1,094,240
Fair Value, Measurements, Recurring | Other Securities | Asset-backed Securities    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Securities available for sale 527,099 373,254
Fair Value, Measurements, Recurring | Other Securities | Municipal Bonds    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Securities available for sale 26,311 26,892
Fair Value, Measurements, Recurring | Other Securities | Corporate Bonds    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Securities available for sale 882,226 867,182
Fair Value, Measurements, Recurring | Other Securities | Foreign Notes    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Securities available for sale 25,538  
Fair Value, Measurements, Recurring | Other Securities | Capital Trust Notes    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Securities available for sale 90,547 95,915
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Securities available for sale 64,985 41,839
Total equity securities 15,493 15,414
Total securities 80,478 57,253
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Preferred Stock (Par Value: $0.01)    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total equity securities 15,493 15,414
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other Securities    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Securities available for sale 64,985 41,839
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other Securities | U. S. Treasury Obligations    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Securities available for sale 64,985 41,839
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Securities available for sale 5,748,348 5,811,218
Total equity securities 16,083 17,416
Total securities 5,764,431 5,828,634
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Mutual Funds and Common Stock    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total equity securities   17,416
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Mutual Funds    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Total equity securities 16,083  
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Mortgage-Related Securities    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Securities available for sale 3,038,325 3,353,735
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Mortgage-Related Securities | GSE Certificates    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Securities available for sale 1,209,610 1,552,623
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Mortgage-Related Securities | GSE CMOs    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Securities available for sale 1,828,715 1,801,112
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Other Securities    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Securities available for sale 2,710,023 2,457,483
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Other Securities | GSE Debentures    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Securities available for sale 1,158,302 1,094,240
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Other Securities | Asset-backed Securities    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Securities available for sale 527,099 373,254
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Other Securities | Municipal Bonds    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Securities available for sale 26,311 26,892
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Other Securities | Corporate Bonds    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Securities available for sale 882,226 867,182
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Other Securities | Foreign Notes    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Securities available for sale 25,538  
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Other Securities | Capital Trust Notes    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Securities available for sale $ 90,547 $ 95,915
[1] Excludes accrued interest receivable of $14.9 million included in other assets in the Consolidated Statements of Condition.
[2] Excludes accrued interest receivable of $24.4 million included in other assets in the Consolidated Statements of Condition.
[3] The underlying assets of the asset-backed securities are substantially guaranteed by the U.S. Government.
[4] Primarily consists of mutual funds that are CRA-qualified investments.