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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale $ 6,193,706 [1] $ 5,844,909 [2]
Total equity securities 15,801 31,576
Total securities 6,193,706 5,844,909
Asset-backed Securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 520,773 [3] 527,099 [4]
Mutual Fund    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 15,801 16,083
Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 6,177,905 5,813,333
Total equity securities 15,801 31,576
Total securities 6,193,706 5,844,909
Fair Value, Measurements, Recurring | Foreign Notes    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 25,993  
Fair Value, Measurements, Recurring | Preferred Stock    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total equity securities   15,493
Fair Value, Measurements, Recurring | Mutual Fund    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total equity securities 15,801 16,083
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 64,998 64,985
Total equity securities   15,493
Total securities 64,998 80,478
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Preferred Stock    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total equity securities   15,493
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 6,112,907 5,748,348
Total equity securities 15,801 16,083
Total securities 6,128,708 5,764,431
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Mutual Fund    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total equity securities 15,801 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 3,195,588 3,038,325
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 1,209,318 1,209,610
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 1,986,270 1,828,715
Fair Value, Measurements, Recurring | Mortgage-Related Securities | Municipal Bonds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 26,011  
Fair Value, Measurements, Recurring | Mortgage-Related Securities | 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   3,038,325
Fair Value, Measurements, Recurring | Mortgage-Related Securities | Quoted Prices in Active Markets for Identical Assets (Level 1) | GSE Certificates    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale   1,209,610
Fair Value, Measurements, Recurring | Mortgage-Related Securities | Quoted Prices in Active Markets for Identical Assets (Level 1) | GSE CMOs    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale   1,828,715
Fair Value, Measurements, Recurring | Mortgage-Related Securities | Significant Other Observable Inputs (Level 2)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 3,195,588  
Fair Value, Measurements, Recurring | Mortgage-Related Securities | Significant Other Observable Inputs (Level 2) | GSE Certificates    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 1,209,318  
Fair Value, Measurements, Recurring | Mortgage-Related Securities | Significant Other Observable Inputs (Level 2) | GSE CMOs    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 1,986,270  
Fair Value, Measurements, Recurring | Mortgage-Related Securities | Significant Other Observable Inputs (Level 2) | Capital Trust Notes    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 94,131  
Fair Value, Measurements, Recurring | Other Securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 2,982,317 2,775,008
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 64,998 64,985
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 1,368,341 1,158,302
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 520,773 527,099
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
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 882,070 882,226
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 94,131 90,547
Fair Value, Measurements, Recurring | Other Securities | 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 64,998 64,985
Fair Value, Measurements, Recurring | Other Securities | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. Treasury Obligations    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 64,998 64,985
Fair Value, Measurements, Recurring | Other Securities | Significant Other Observable Inputs (Level 2)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 2,917,319 2,710,023
Fair Value, Measurements, Recurring | Other Securities | Significant Other Observable Inputs (Level 2) | GSE Certificates    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale   1,158,302
Fair Value, Measurements, Recurring | Other Securities | Significant Other Observable Inputs (Level 2) | GSE Debentures    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 1,368,341  
Fair Value, Measurements, Recurring | Other Securities | Significant Other Observable Inputs (Level 2) | Asset-backed Securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 520,773 527,099
Fair Value, Measurements, Recurring | Other Securities | Significant Other Observable Inputs (Level 2) | Municipal Bonds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 26,011 26,311
Fair Value, Measurements, Recurring | Other Securities | Significant Other Observable Inputs (Level 2) | Corporate Bonds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale 882,070 882,226
Fair Value, Measurements, Recurring | Other Securities | Significant Other Observable Inputs (Level 2) | Foreign Notes    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale $ 25,993 25,538
Fair Value, Measurements, Recurring | Other Securities | Significant Other Observable Inputs (Level 2) | Capital Trust Notes    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale   $ 90,547
[1] Excludes accrued interest receivable of $14.8 million included in other assets in the Consolidated Statements of Condition.
[2] Excludes accrued interest receivable of $14.9 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] The underlying assets of the asset-backed securities are substantially guaranteed by the U.S. Government.